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Touchscreen unresponsive when dock is connected

After updating OTA the other day (I've always been on stock firmware), my tablet seemed to be working fine. However, once I connect the dock sections of my touchscreen become unresponsive. I can still scroll and click with the touchpad on my dock and parts of the touchscreen still work. This only started happening after the update - without the dock my touchscreen works perfectly (unless I connect the dock first, in which case I need to restart my tablet before the screen works again).
I'm not sure if this is an issue with the update or if anyone else has experienced the same problems. Hopefully someone will know what's up.
Any help is appreciated!
Edit: Was playing around a bit and realized I could "fix" it by locking/unlocking the tablet with the dock connected...so I suppose it's not a hardware issue but rather a problem with the new update.

bamtori said:
After updating OTA the other day (I've always been on stock firmware), my tablet seemed to be working fine. However, once I connect the dock sections of my touchscreen become unresponsive. I can still scroll and click with the touchpad on my dock and parts of the touchscreen still work. This only started happening after the update - without the dock my touchscreen works perfectly (unless I connect the dock first, in which case I need to restart my tablet before the screen works again).
I'm not sure if this is an issue with the update or if anyone else has experienced the same problems. Hopefully someone will know what's up.
Any help is appreciated!
Edit: Was playing around a bit and realized I could "fix" it by locking/unlocking the tablet with the dock connected...so I suppose it's not a hardware issue but rather a problem with the new update.
Click to expand...
Click to collapse
After the 4.2 update, my tablet has also become totally incapable of working with the dock connected.
Everything stops working as soon as I connect it; Seems even worse than what you're experiencing.
I hope Asus knows this, because I am sure it has to do with their update, not my tablet

Mmmmhh... So far for quality control? I really do feel f r you guys, asn many of you will not have been able to unlock, and therefore cannot go the custom route. (Especially sad for you, adelancker, since your tablet was unlocked originally!)

You tried a complete system reformat. Restore to Factory?

KinetiClutch said:
You tried a complete system reformat. Restore to Factory?
Click to expand...
Click to collapse
with the dock connected? You can't
Without the dock connected, yes, and got no results
Hahaha, Asus really messed up good.
@MartyHulskemper I have been able to unlock after a lot of whining!
But still, the problem originated from before the unlocking itself...
But you might have given me an idea!!!!
I can try and:
1) make a nandroid
2) go back to 4.1 Cromi
3) connect the dock: see if that works
and then try to
4) flash 4.2 Cromi-X on it with the dock connected.
Maybe that'd help?

adelancker said:
After the 4.2 update, my tablet has also become totally incapable of working with the dock connected.
Everything stops working as soon as I connect it; Seems even worse than what you're experiencing.
I hope Asus knows this, because I am sure it has to do with their update, not my tablet
Click to expand...
Click to collapse
bamtori said:
After updating OTA the other day (I've always been on stock firmware), my tablet seemed to be working fine. However, once I connect the dock sections of my touchscreen become unresponsive. I can still scroll and click with the touchpad on my dock and parts of the touchscreen still work. This only started happening after the update - without the dock my touchscreen works perfectly (unless I connect the dock first, in which case I need to restart my tablet before the screen works again).
I'm not sure if this is an issue with the update or if anyone else has experienced the same problems. Hopefully someone will know what's up.
Any help is appreciated!
Edit: Was playing around a bit and realized I could "fix" it by locking/unlocking the tablet with the dock connected...so I suppose it's not a hardware issue but rather a problem with the new update.
Click to expand...
Click to collapse
Did you apply the update with the dock detached?
Have you tried rebooting with the dock attached? If that does not solve it, I would reflash the last update with the tablet docked.
Sent from my ASUS Transformer Pad TF700T using Tapatalk HD

berndblb said:
Did you apply the update with the dock detached?
Have you tried rebooting with the dock attached? If that does not solve it, I would reflash the last update with the tablet docked.
Sent from my ASUS Transformer Pad TF700T using Tapatalk HD
Click to expand...
Click to collapse
The update was applied without the dock. I tried a factory reset to no avail - although, cold-booting a few times seemed to make the problem less frequent. Restarting with the dock connected had no effect.
Strangely enough, I noticed the system bar lock was enabled by default (it was disabled before the update), once I disabled it again I noticed an immediate difference in the performance of my tablet. Much less frequent lag/unresponsiveness with the dock connected - No idea why this would make a difference though

berndblb said:
Did you apply the update with the dock detached?
Have you tried rebooting with the dock attached? If that does not solve it, I would reflash the last update with the tablet docked.
Sent from my ASUS Transformer Pad TF700T using Tapatalk HD
Click to expand...
Click to collapse
I can say that I did that update to 4.2 without dock, I am afraid.
I have tried rebooting, but it just won't boot as long as the dock's connected...

I have the same thing* . Tried many things hard reset, cold boot, downgrade..but unfortunately nothing helps :/
Now I want to drain completely battery-especially in mobile dock
*The same thing means tablet is unresponsive when dock connected(I can't: boot with it, lock scren, neither make factory reset)
Fortunetly I still have warranty, but can't give it now, because I need it for holidays. So did you find something that could help me?
Temporary solution is downgrade to 4.1(10.4.2.20), then it doesn't lag and I can use USB port so I can have keyboard and mouse, but this isn't mobile solution.. (sometimes it also charges from dock-I think when tablet battery is below 90% , but when dock is connected to charger, then it charges whole time)
I don't remember if I made update with or without dock connected.

Keyboard dock malfunction

Okay. I seen a thread about the keyboard dock not working, but I'm a bit lost. For starters, there's apparently a way to update the keyboard dock. LoL!! Also, the issue isn't quite the same as their's.
Here's the situation. The dock charges the tablet, the tablet recognizes the dock, and the mouse pad works. The keyboard buttons don't work. It doesn't type or anything. The tablet sees that the dock is there and tells you to type with it and stuff, but you can't type.
Imagine a laptop where only the touchpad works. It's weird. She said this happened 2 days ago. Today is Aug 11th, so it happened Aug. 09th. (Since some people talk DD/MM instead of MM/DD LoL!!)
Any ideas on how to fix? I'm trying to check for an update, but it's telling me: "Internet connection error or the server is busy. Please wait a moment and try again."
The tablet is completely stock.
I see the dock is a version number:
EP101-0213
My only other option is to take it with me and try a more stable internet connection. Or maybe rooting and see what I can do from there.

The first thing I would try would be a factory reset to partially rule out stock ROM problems
Before that, I would flash TWRP Recovery and make a Nandroid backup
If things still aren't working after the reset, I'd flash a custom ROM to 100% rule out stock ROM problems
Still not working after that, I'd open the dock and check that the keyboard cable has not come loose
Or, if you're brave enough, reverse that and open the dock first
Easyflasher has everything you need for getting root and flashing TWRP recovery
http://forum.xda-developers.com/showthread.php?t=1688012

*Detection* said:
The first thing I would try would be a factory reset to partially rule out stock ROM problems
Before that, I would flash TWRP Recovery and make a Nandroid backup
If things still aren't working after the reset, I'd flash a custom ROM to 100% rule out stock ROM problems
Still not working after that, I'd open the dock and check that the keyboard cable has not come loose
Or, if you're brave enough, reverse that and open the dock first
Easyflasher has everything you need for getting root and flashing TWRP recovery
http://forum.xda-developers.com/showthread.php?t=1688012
Click to expand...
Click to collapse
Um...? You say I can open the dock and check to see if the keyboard cable has not come loose, or if I'm brave enough open the dock first. Wait!! I get what you're saying now. LoL!!
It is weird. Others are saying the keyboard AND mousepad doesn't work but all other functions do, like charging and the ports. This seems to be a weird one since the only thing that doesn't work is the keyboard. My mousepad still works. Hmm...
I'm hoping it's something that simple. I was thinking about buy the table from her. If I do that then I'd do some hardware stuff like that. Hmm... I guess I better get downloading then. I wished I kept my Transformer stuff. I didn't think I'd still need it. LoL!! Thanks for the link.

No_Nickname90 said:
Um...? You say I can open the dock and check to see if the keyboard cable has not come loose, or if I'm brave enough open the dock first. Wait!! I get what you're saying now. LoL!!
It is weird. Others are saying the keyboard AND mousepad doesn't work but all other functions do, like charging and the ports. This seems to be a weird one since the only thing that doesn't work is the keyboard. My mousepad still works. Hmm...
I'm hoping it's something that simple. I was thinking about buy the table from her. If I do that then I'd do some hardware stuff like that. Hmm... I guess I better get downloading then. I wished I kept my Transformer stuff. I didn't think I'd still need it. LoL!! Thanks for the link.
Click to expand...
Click to collapse
Similar topic to the "Internet connection error or the server is busy. Please wait a moment and try again".
Look like DMClint can't connect to mdm.asus.com at this moment
http://forum.xda-developers.com/showthread.php?t=2401337

There are 3 independent circuits in the Dock:
Charging Circuit
USB circuit (includes the touchpad)
Keyboard Circuit.
Any one of these three can stop working and the other 2 will work fine. I would check the ribbon cables to make sure they are all seated properly in the dock. Since the Touchpad is part of the USB ports and is not integrated with the keyboard circuit, it is very possible that the keyboard ribbon came loose. Or worse, the daughterboard that controls the keyboard decided to head south....

frederuco said:
There are 3 independent circuits in the Dock:
Charging Circuit
USB circuit (includes the touchpad)
Keyboard Circuit.
Any one of these three can stop working and the other 2 will work fine. I would check the ribbon cables to make sure they are all seated properly in the dock. Since the Touchpad is part of the USB ports and is not integrated with the keyboard circuit, it is very possible that the keyboard ribbon came loose. Or worse, the daughterboard that controls the keyboard decided to head south....
Click to expand...
Click to collapse
Thanks. As of now, it's no point in worrying about it. I've left her house and probably won't be there in a while. I also don't want to open her tablet since it's not mines. *sigh*
But I may have too since she wants to sell it. Thanks for the info. I guess I can start looking for some tools to open it. I didn't see any types of screws, so I'm guessing you pry it open.
I won't start another question in this thread. I'll search for that elsewhere. Thanks anyways. That'll make it easier to try and fix if I can get it open. LoL!!

No_Nickname90 said:
Thanks. As of now, it's no point in worrying about it. I've left her house and probably won't be there in a while. I also don't want to open her tablet since it's not mines. *sigh*
But I may have too since she wants to sell it. Thanks for the info. I guess I can start looking for some tools to open it. I didn't see any types of screws, so I'm guessing you pry it open.
I won't start another question in this thread. I'll search for that elsewhere. Thanks anyways. That'll make it easier to try and fix if I can get it open. LoL!!
Click to expand...
Click to collapse
You need a small (0 or 00) Philips screwdriver. There are screws under the back 2 rubber feet. Then carefully pry it open. I start by the USB port in the back and work around. Be sure you remove any USB or SD cards or you may be sorry...

Ah!! Thanks. I was wondering if there would be screws under those little rubber grooves. Next time I visit her, I'll be prepared. Thanks for that. I'll probably bump this post (3 months down the road LoL!!) if I fix it. So others can see that it is fixable. I'll take pictures of the inside too.

Keeps going into car mode...

My M8 for the past week has been entering car mode for no apparent reason. Could it be there is something wrong with the USB port on the phone or something else?

It's the charger/cable you're using. My M8 does it as well with a cable (that's a power-only cable, no data pins) I use to charge my phone from my PC with. I've had 4 replacement M8s (all for separate hardware issues) and they all did the same thing on the same cable. It hasn't done it with any of the other several chargers I use at home. But when it does to it on that one cable, it only seems to do it when I try to use any demanding apps/games while plugged in. It won't do it if I'm just poking around the launcher or browser.

Mine is happening when not plugged in also.

sco77 said:
Mine is happening when not plugged in also.
Click to expand...
Click to collapse
Ahh, well then yeah, I would have to say there's definitely some hardware issue with your USB port then.

Yup, my phone is screwed its stuck in car mode, tried everything. Is there a way to edit a system file to completely disable it? Replacing phone is not an option for me.
Sent from my HTC One_M8 using XDA Free mobile app

sco77 said:
Yup, my phone is screwed its stuck in car mode, tried everything. Is there a way to edit a system file to completely disable it? Replacing phone is not an option for me.
Sent from my HTC One_M8 using XDA Free mobile app
Click to expand...
Click to collapse
I've tried disabling/freezing anything with the word "car" in it in Titanium Backup to no avail on my M8, it still does it with that same cable. When it does it and the "Car Mode Enabled" notification shows up in the notification shade, I can long-press it and go to app info, where it takes me to "Android System", so it appears to have hooks deep into the Android OS and something you can't really disable. This Xposed module may have some options to disable it or at least keep it from being so invasive if you're rooted.
But I guarantee you that you can get the phone replaced under warranty, even if you have it S-Off'd/unlocked, because I have done it. Unless your phone is physically damaged..? But even then, they may not charge to repair the USB port or motherboard if that's the only issue. Can't hurt to ask HTC.

I seem to have "fixed" it by plugging it in about 20-30 times and violently yanking out the cable... Not sure how long this fix will last since looking into the port I seen nothing wrong with any of the pins or any contaminants in there, also high pressure air didn't work.

sco77 said:
I seem to have "fixed" it by plugging it in about 20-30 times and violently yanking out the cable... Not sure how long this fix will last since looking into the port I seen nothing wrong with any of the pins or any contaminants in there, also high pressure air didn't work.
Click to expand...
Click to collapse
I had exact same issue. It is debris stuck in the port. Get some computer duster or air compressor and it will clear it up

Nice
Hey you guys need to go to app manager then swipe to (all) under that you should disable dock mode and car mode then reboot. Should fix problem for live. Some magnets and other objects will toy with the sensors in your phone expecially the ones by the USB connector

I've been having this problem too. The Car app and Daydream would randomly open and close. I've just performed a hard reset and it appears to have fixed the problem.
----------UPDATE 3 DAYS LATER.....
So a hard reset has not fixed this. The car app did not open for a couple of days but I have had the loud speaker turning on every time I answer a call. I've just used my earphones with the phone for the first time since I performed the hard reset and now the car app is opening again. I've tried to clean out the 3.5mm socket but its not making a difference. It seems strange that the hard reset did kind of fix it until the earphone socket was used. Now I really don't know if it's a hardware or software issue!

I had the same issue with my M8 unlocked version. Also had the problem where the speakerphone would go on and off during calls and some other issues but now since updating to the newest HTC build with Android 5.0 I haven't noticed anything.
Could it be that HTC were aware of these issues and have now fixed them?
Have any of you had progress with the new update or are the issues still apparent?
Will update later when I have had more time to test the new software out but as of now it looks like its fixed.

Mine just started doing this tonight too.. no matter what kind of cable gets plugged in to it, it goes into car/ docked mode and turns my wifi on, and rotates all around when I don't want it to. It's VERY annoying. I tried doing a factory reset on it and it's still doing it when I plug a charger in. It also is doing it just randomly when no cable is plugged in.
I'm wondering if a lot of people are having this issue recently, if it was something in one of the recent updates to the HTC service pack sent out by HTC via the Play Store. Anyone know???

Well, so much for that update...
After almost exactly a week without any problems it started acting up again this morning. In and out of carnode. Guess I'll just make use of my warranty and send it in for service.

yep.. me too. Did a reset and was working fine for about a week and just started doing it again today. WTF.

This was happening to me back in the fall. IIRC, my fix was to clean out the charging port. Look for how-to on web. I think the problem is some crossed pins with dirt making the phone think it's plugged in to dock.
Sent from my Gunmetal Grey M8

My phone just started doing this on the 5th.
It also rotates when it's not supposed to? It is so annoying and idk what to do. Is this a. HTC issue or what?

littleames said:
My phone just started doing this on the 5th.
It also rotates when it's not supposed to? It is so annoying and idk what to do. Is this a. HTC issue or what?
Click to expand...
Click to collapse
I had my phone sent in for service and it turned out to be a faulty speaker. They swapped it and I haven't encountered any of the problems I had prior to sending it in.
How the speaker was interfering with the operating system I have no idea, my best guess it was shorting out something but it's just a theory.

phone keeps entering car mode
I have had this issue and completely fixed it, on your phone find car mode, scroll down to a hidden settings menu, in settings disable auto dock mode, auto connect, in fact disable everything, then exit car mode using the exit button. Restart your phone and hopefully it never enters car mode again and charges normally.
I had this issue for months and bought a new phone that I didn't like so came back to the HTC and eventually fixed it.

This is the flex USB cable. They go bad and cause car mode / dock mode like this. The cable itself is $14 and you likely will be replacing the sticker speaker grills which are $11. I have personally repaired this and it is the only permanent fix. Not disabling an app. Not removing an app. This failure is due to hardware and hardware only.
BTW.... way to dig up an old thread lol.
Sent from my Nexus 6 using Tapatalk

I have this issue since three days and it's driving me mad.
Tried all the suggested solutions and nothing worked so far.
I've ordered a new USB flex cable with charge dock pcb. I'll be sure to post my experiences with that, hope it fixes this annoying issue as Dottar suggested

Keyboard dock issues - katkiss 6.0.1

O happy day- got a keyboard dock. Happiness was short lived; after allowing the dock to charge overnight, I was unable to get either of my tf300's to work with it. The tablets will recognize it as a charging device (you can see the 2 battery icons on the status bar) but that's it- no track pad or keyboard functions. I haven't tried to see if usb is active, though. I've attempted the troubleshooting steps I've seen online, like cold booting a tablet while connected to the dock, all to no avail...
Anyhow, obviously there's no warranty in play here, so I was curious if anyone had any know-how on servicing the dock? I read on Tom's Hardware that the dock needs to be glued somehow after disassembly, so i'd like to consider that "last resort", but if that is what it's going to take, that's okay. Anybody have any suggestions?

monogwai said:
O happy day- got a keyboard dock. Happiness was short lived; after allowing the dock to charge overnight, I was unable to get either of my tf300's to work with it. The tablets will recognize it as a charging device (you can see the 2 battery icons on the status bar) but that's it- no track pad or keyboard functions. I haven't tried to see if usb is active, though. I've attempted the troubleshooting steps I've seen online, like cold booting a tablet while connected to the dock, all to no avail...
Anyhow, obviously there's no warranty in play here, so I was curious if anyone had any know-how on servicing the dock? I read on Tom's Hardware that the dock needs to be glued somehow after disassembly, so i'd like to consider that "last resort", but if that is what it's going to take, that's okay. Anybody have any suggestions?
Click to expand...
Click to collapse
Well, here's a status update... I've gone ahead and opened the dock, and nothing really looked out of place, so I went ahead and reattached the various cables and screwed the sucker back together. I now have the keyboard working. The trackpad, however, still is not working. I took it apart a second time and verified that the cables for the trackpad were plugged all the way in (where the black line on the ribbon cables are flush with the connectors on the boards), and still no go. Anybody have any experience with a non-functional trackpad?

monogwai said:
Well, here's a status update... I've gone ahead and opened the dock, and nothing really looked out of place, so I went ahead and reattached the various cables and screwed the sucker back together. I now have the keyboard working. The trackpad, however, still is not working. I took it apart a second time and verified that the cables for the trackpad were plugged all the way in (where the black line on the ribbon cables are flush with the connectors on the boards), and still no go. Anybody have any experience with a non-functional trackpad?
Click to expand...
Click to collapse
Oh, wow! It didn't even take me an hour to break it again. Went and re-read threads on various forums, and people were having some luck with cold booting while docked. So I did, and yet again the keyboard ceased functioning. Despite having not even moved while reading/rebooting, I opened the dock once more. Of course, nothing appears to have changed, so I don't even know what to do at this point. The vendor has refunded my money, so at least I'm not out anything; it'd be really nice if I could somehow restore function, though.
I can get a replacement keypad/trackpad off eBay, but I'm concerned that my problem may be where the cables attach to the main board. Of course it could also be the ribbon cables themselves. Anyone know somewhere to get new cables at a reasonable price?

I've got the keyboard working again. Seems like once I plug it in to charge, the keyboard stops working and i have to go play with the cables to remedy that. that's only when charging with the tablet attached. haven't tried seeing what happens if i undock, then charge, then redock.
kinda surprised nobody's had any input... <shrugs>. and in regards to something i had said before, it seems i was a bit mistaken: i can order a replacement keypad, but not the trackpad. i'm wondering if i might need a new main board for this instead, though. would like to hear something out of someone who's replaced a board in the dock before i pull the trigger on one. anyone? anyone? Bueller?

new update:
had to set the dock to charge, and naturally, the keyboard didn't work. so i went and took it apart again. this time, though, I plugged the tablet in to the base prior to screwing everything back. I detached the cables from the mainboard, reseated, and checked-- no change. so I detached the mainboard cables again, and proceeded to reseat the cabling where the touchpad is. snapped the tablet back into place; lo and behold, I got a little circle on screen... hey! the trackpad's working!!! Excitedly, I screwed the screws under the trackpad button, and replaced the button, and proceeded to close the tablet so I could flip the dock over and replace the other screws/feet. Opened everything back up and unlocked the tablet and.............. <price is right tuba noise here> no trackpad. total freaking bummer.
I'm guessing now that maybe there's some kind of short somewhere. When I get to my destination this evening (or perhaps tomorrow, to be honest), I will further explore this new development. It's interesting at the very least. I do know the pad isn't totally dead in the water.
it's odd... charging causes the keyboard to stop functioning, and screws apparently cause the pad to stop functioning. very odd.

i've sat down and dismantled the entire thing. i decided to unplug the battery from the system board for a while thinking there might be some kind of situation where that could be helpful. let it sit probably 2 hours while i worked on something else. now i've reassembled, snapped it back together (but no screws yet), and the trackpad is working. has been working for the last hour, give or take. dock is down to 38% charge, so i'm trepidatious (is that even a word? lol) about which step to take next -- seeing what happens when i screw this thing back together, or try and see what happens when i attempt to charge it. i'll have to make some sort of decision, so once that happens, i'll post yet another update. hopefully a solve.

Problems with a dock? unplug that battery for a while!
I've rounded the last corner i think. i've got the charger plugged in to the dock as i sit here and type; trackpad still works too. all that's left is trying to screw it back together, so i'm gonna call this tenatively solved. because if i just can't have screws for some strange reason, i suppose i'm fine with that.

Still working... How does one go about marking something 'solved'? Ask a mod...?

Unresponsive Touch Screen. Some Ghost Touches.

Hi,
My TF300T stopped responding to my touches and has some ghost touches now occurring just under the ASUS logo in the bezel. Has anyone else experienced this and can offer a fix? Is this a shot digitizer?
FYI, I've tried a cold start, cleaning the screen, and resetting the tablet using the small hole on the left. None of those worked. The track pad still works so I can still use the tablet as a netbook, but that sucks.
Any other suggestions?

DoughMucker said:
Hi,
My TF300T stopped responding to my touches and has some ghost touches now occurring just under the ASUS logo in the bezel. Has anyone else experienced this and can offer a fix? Is this a shot digitizer?
FYI, I've tried a cold start, cleaning the screen, and resetting the tablet using the small hole on the left. None of those worked. The track pad still works so I can still use the tablet as a netbook, but that sucks.
Any other suggestions?
Click to expand...
Click to collapse
Please look at this thread http://forum.xda-developers.com/showthread.php?t=2021701!

ebonit said:
Please look at this thread http://forum.xda-developers.com/showthread.php?t=2021701!
Click to expand...
Click to collapse
I've tried all the fixes in that thread. And in that thread, their screens still work for them ... mine doesn't at all.
FYI, I also don't use a screen protector

DoughMucker said:
I've tried all the fixes in that thread. And in that thread, their screens still work for them ... mine doesn't at all.
Click to expand...
Click to collapse
I can understand. There is also a lot of trash in that thread and no convincing solution except via RMA from Asus. It's still a mystery!
I don't know what rom do you use and what recovery. What do you think about format data (not wipe or factory reset) and then a clean reinstallation of your current rom. If it is a soft ware problem it might be solved. If not it might surly be a hard ware problem. That means to swap the touch screen. On the other hand before realize such a decision you could try get back to the last Asus stock rom JB and look what happened then. Trial and error is the only way to figure out the cause in order to solve it. Please keep us posted whatever you are going to try. Thanks!

I'm using KatKiss MM v28 and Kang TWRP 2.8.7.2. I launched TWRP, but was unable to use either the touchscreen nor trackpad. The trackpad is unsupported in the version I use, I guess. I suspect this is a hardware issue as the touchscreen didn't work in TWRP.
I'm travelling now and don't have a suitable place to open up the tablet to look for loose connections. I'll do that when I get home.

DoughMucker said:
I'm using KatKiss MM v28 and Kang TWRP 2.8.7.2. I launched TWRP, but was unable to use either the touchscreen nor trackpad. The trackpad is unsupported in the version I use, I guess. I suspect this is a hardware issue as the touchscreen didn't work in TWRP.
Click to expand...
Click to collapse
Regarding your suspicion about the track pad support I may tell you the inverse. I'm also using #28 and the same TWRP like you. The track pad of the dock works fine and the USB mouse as well either wireless or with cable. I have tried both.

ebonit said:
The track pad of the dock works fine and the USB mouse as well either wireless or with cable. I have tried both.
Click to expand...
Click to collapse
Hmm. I wonder if the ghost touches are interfering with the trackpad. I'll try a USB mouse when I'm back at home. Thanks for confirming they work in TWRP.

Tried a USB mouse in TWRP. It works. Flashed v29, but the issue remains. I may try formattig data later.
I took the back off the tablet and disconnected a couple connections on the digitizer. I first disconnected the two smaller ribbon cables. The ghost touches remained after rebooting. I then disconnected the larger cable above them and the ghost touches stopped.
I think I'll look into a replacement digitizer.