Reverse charging otg ?? - Huawei Mate 9 Questions & Answers

Hi guys. This is a weird issue perhaps and not entirely sure where to post this.
I have a Chinese version mate 9 pro that's been rebranded to lon l29c636b228 and rooted. Everytime I connect otg it automatically goes to reverse charging. I connect otg quite often so it gets annoying when you have to manually set otg settings to mtp again and again and again....you see where I'm going with this. In default settings otg is set to mtp and yet when I connect otg it goes to reverse charge. What gives!! Is there anything that can be done to be rid of this god forsaken glitch??

Related

Android Auto on Mate 9

Hi,
I am not sure if this problem is related to
- Mobile Phone
- Android Auto
- Car
So my question is: Does someone already has a working Android Auto connection with a car´s radio with this phone?
If so, I will continue this in Android Auto section.
Today I upgraded build to: MHA-L29C432B138
Car/Radio: Opel Astra K (MY2017)/ Intellilink R4.0
The connection could be established. But screen of car stays black. When touching screen or saying "OK Google" it accepts voice command.
My Mate 7 works perfectly...
Best regards,
Robert
no idea... working oke on my golf 7 2015 mib2 unit..
u using original cable... i also try ith lumia 950 cable, also usb-c but random disconnecting with this cable.
P9 is also working. I guess the problem is Mate 9.
Mine works with Pioneer but doesn't work well. It Will not play anything already downloaded to the device unless you connect phone to head unit forest and actually play something through Bluetooth first and THEN connect it. All permissions are set correctly etc. And what is with having to give it permission to use the data on the phone EVERY SINGLE TIME?
US model working flawlessly with 2016 VW Golf R... I did have to reinstall audible and spotify after connecting the first time in order for them to show up in the menu, but other than that, no issues with connecting, audio skips, etc. Very happy! Samsung S7 Edge was unusable with AA.
Got the International Mate 9 Pro and AA is working perfectly fine with my Pioneer 4100nex. I'm on the latest Pioneer firmware 1.09 if that helps anyone.
Works like a charm
What settings do you guys have? Do you have usb debugging or anything like that enabled in dev settings? Every time I hook up it comes up with the dialogue box to enable data access. Whether I click enable or not it will not play anything stored on phone. I've had this confirmed by Huawei Australia. They couldn't get it going either.
I have all the correct permissions set for all apps including android auto.
Any hints?
MontAlbert said:
What settings do you guys have? Do you have usb debugging or anything like that enabled in dev settings? Every time I hook up it comes up with the dialogue box to enable data access. Whether I click enable or not it will not play anything stored on phone. I've had this confirmed by Huawei Australia. They couldn't get it going either.
I have all the correct permissions set for all apps including android auto.
Any hints?
Click to expand...
Click to collapse
In developer options I do have "Always prompt when connecting to USB" turned off and "Select USB Configuration" set to MTP. I don't get prompted for anything on the phone. USB Debugging is off. I don't try to play anything from USB though, just use AA, Spotify, and Audible.
Other than that, I do have an Automagic script that when car ui mode is entered, the screen gets turned on, Waze is launched, slide to unlock keyguard is dismissed, and wifi is turned off. I won't need to do most of this when Waze is AA compatible, but until then, I can't live without it. This script works about 90% of the time, still haven't finished tweaking it for 100% success. Worst case, I have to turn the phone back on, swipe down on the notification panel, then select waze from "Notification Shortcuts".
bwillet said:
In developer options I do have "Always prompt when connecting to USB" turned off and "Select USB Configuration" set to MTP. I don't get prompted for anything on the phone. USB Debugging is off. I don't try to play anything from USB though, just use AA, Spotify, and Audible.
".
Click to expand...
Click to collapse
Seems this is possibly the issue. Whenever I connect usb it automatically changes the usb connection type to charge only. Won't let me change it to mtp, audio or anything else. Wonder if there is a hidden setting somewhere in emui that does this... Tried it in dev settings. Same issue. Charge only
MontAlbert said:
Seems this is possibly the issue. Whenever I connect usb it automatically changes the usb connection type to charge only. Won't let me change it to mtp, audio or anything else. Wonder if there is a hidden setting somewhere in emui that does this... Tried it in dev settings. Same issue. Charge only
Click to expand...
Click to collapse
I couldn't find anything else that I changed that seems relevant. I'm just using a standard USB to USB-C cable (Anker PowerLine+) plugged into the USB port in my VW Golf.
Did you change both of those settings I mentioned? If so, when you go back into dev settings does "Select USB Configuration" still say MTP, or did it default back to Charge Only? Maybe you have to reboot after? dunno...
bwillet said:
I couldn't find anything else that I changed that seems relevant. I'm just using a standard USB to USB-C cable (Anker PowerLine+) plugged into the USB port in my VW Golf.
Did you change both of those settings I mentioned? If so, when you go back into dev settings does "Select USB Configuration" still say MTP, or did it default back to Charge Only? Maybe you have to reboot after? dunno...
Click to expand...
Click to collapse
I changed those 2 you said but as soon as I plug in the Huawei cable (thought maybe it needed the Huawei cable) it changes itself to charging...
I'll keep looking into it. Thanks for your help though. This is obviously the issue.
I'm having the same issue in the US version on a 2017 VW GLI. My last two phones worked flawlessly.
MontAlbert said:
Seems this is possibly the issue. Whenever I connect usb it automatically changes the usb connection type to charge only. Won't let me change it to mtp, audio or anything else. Wonder if there is a hidden setting somewhere in emui that does this... Tried it in dev settings. Same issue. Charge only
Click to expand...
Click to collapse
Mine goes to charge only as well however my android auto is working perfectly.
It connects and on the phone side it seems fine but the head unit screen goes black and doesn't do anything.
Hi.. Is there anyway to prevent WhatsApp notifications showing up in android auto?
Mate 9 L29 - B156 in a Seat Ibiza 2016.
Android auto working fine.
You have reviewed android permissions, or if Google app or maps are set to close when the screen is turned off And enable activation?
In my old zenfone 3 that was the problem
Did any of you guys tried to enable the USB debugging mode?
Emil Borconi said:
Did any of you guys tried to enable the USB debugging mode?
Click to expand...
Click to collapse
JA! This was first thing, but no success.
I am also disappointed by Huawei customer care. They just point at Google and say it is not their fault.
Does anyone know how to log / where to find the log when "Force logging" is enabled in dev options in AA?
debart said:
JA! This was first thing, but no success.
I am also disappointed by Huawei customer care. They just point at Google and say it is not their fault.
Does anyone know how to log / where to find the log when "Force logging" is enabled in dev options in AA?
Click to expand...
Click to collapse
Open android auto, go to about, tap the Android auto title 10 times, you will see a toast saying your developer. Now from the 3 dotted menu on the right select developer options locate force logging and make sure it's enabled

Asus Z380KL Cant switch to MTP

Hello first sorry for my bad english, second i just got an older Asus Z380KL (runing Android 6.0.1 latest update from Asus) and its working fine for the most part. I just cant connect it to my PC (Windows 7/10) using USB. When i plug it in to my PC in device manager i dont see any new device but the Tablet is charging.
The tablet is in charging mode and i cant switch it to MTP. In Setting>Storage there is no option to change the USB mode, i dont get any notification in the pull down bar, in Developer menu i enabled USB debuging and tested the option to switch the USB configuration but if i change to MTP,PTP or RNDIS it always says Charging. I know the USB connector on the tablet is OK just tested my OTG cable and connected a mouse and it was working. Also i used 5 diferent USB cables that work when i try whit my Phone. Also tested all my USB2 and USB3 ports on my PC and laptop.
If anyone can help i wold be very grateful
Edit: Just tried it on Ubuntu 16.04 Live and MTP is working fine, Tablet connects i get the popup in the status bat saying i can pick if i want charging, MTP or PTP but on Windows 7/10 i cant get it to work its always in charging mode and i cant change it.

USB OTG only reverse charging possible

Hello All,
I stumbled upon a problem with my Mate 30 pro. When using a USB stick and or USB card reader I can only select "use USB to reverse charge". When selecting the other options like transfer photos or transfer files the selection jumps after 2 sec back to reverse charge.
I use File manager to transfer pictures from my phone to my computer via a stick and due to this it fails to do this, well it fails to transfer pictures from my phone to my USB stick, from the stick to the phone works...
Using the internal file manager then it works...uninstalled file manager rebooted the phone and reinstalled did not solved my problem. I prefer to work with the file manager from play store and not the internal one...
Google play store is on the latest version, well the same version like on my mate 20 pro.
Just realized that my mate 20 pro is doing exact the same, but there transfer files/pictures from phone to USB stick works.
Have u tried developer options - USB debugging?
viruz1225 said:
Have u tried developer options - USB debugging?
Click to expand...
Click to collapse
Yes I did, also tried to change the same setting - USB config - in the developer options but there it also reverts back to charge only.
I see the exact same automatic return to "Reverse charge" after 2 seconds using OTG, but I can use the internal file manager, so I am not
bothered so much by that. What bothers me is that I want to charge normally (opposite of "Reverse Charge") using OTG since I am using
"Accessory Charging Adaptors" (i.e., I am using an OTG USB Hubs with a power supply included). After many experiments, I see no way to
simultaneously charge my Mate 30 Pro and use an OTG device - Has anyone found a way to do this?
If ACA doesn't work, then chances are that your USB controller driver doesn't have it implemented
[KERNEL] (Patch) USB OTG (host mode) + simultaneous charging!
(I really struggled with where to post this. Although much work and effort went into debugging unique Z5-specific issues, this is based on prior work so I put it here instead of in "original"; also, I would be very surprised if this didn't apply...
forum.xda-developers.com

Can't connect to Windows 10 PC?

For some reason I can't connect my Pixel 4a to my PC with a USB C - USB A cable (or USB A - USB C, not sure what the official name is) , even though it worked fine on my previous phone.
Included with the phone is a USB C - USB A adapter, but I see no use for it unless you have a special USB A cable which I don't.
My motherboard does have a USB C slot on it and it does read my phone when I plug it in that way but for some weird reason it's really loose and doesn't stay connected unless I keep physical pressure on it.
I'm not going to update to Android 11 until the November update because I've heard the current build has a few bugs, but does anyone know if Android 11 fixed the USB C - USB A issue?
Have you made sure to switch to file transfer mode? It defaults to 'no transfer' mode when I plug into my laptop.
Most likely you need to toggle the phone connection settings to data transfer, originally it will be set to charge only I think.
WAusJackBauer said:
For some reason I can't connect my Pixel 4a to my PC with a USB C - USB A cable (or USB A - USB C, not sure what the official name is) , even though it worked fine on my previous phone.
Included with the phone is a USB C - USB A adapter, but I see no use for it unless you have a special USB A cable which I don't.
My motherboard does have a USB C slot on it and it does read my phone when I plug it in that way but for some weird reason it's really loose and doesn't stay connected unless I keep physical pressure on it.
I'm not going to update to Android 11 until the November update because I've heard the current build has a few bugs, but does anyone know if Android 11 fixed the USB C - USB A issue?
Click to expand...
Click to collapse
I had this issue too. Windows file explorer would just crash after one or two files and stop transfer, no matter the size and type. (Yes I had file transfer selected on my phone ?)
Then windows update gave me a driver called "Google Inc. - Other Hardware - Kedacom KDB Composite Interface". I also updated to the newest firmware on the phone. No idea which of these did the trick or if it was the combo. However. Smooth sailing now ??
Hope this helps
(If windows update refuses to give you the driver, you can get it from Microsoft's update catalogue online. A Google search will do)
Ok it's completely messed up. When I search for USB settings it doesn't let me change anything at all, even though when I first got the phone I could and I changed it to transfer files. EDIT: No actually the setting that I changed was a developer option called "Default USB configuration" which I changed to transfer files but that still did nothing.
I just plugged in my phone and looked for the USB setting in the notification area but it wasn't there, but I noticed an option called "manage"
I went in there and noticed this. (see attachments) it's locked to be off and I can't change it. Very odd.
WAusJackBauer said:
Ok it's completely messed up. When I search for USB settings it doesn't let me change anything at all, even though when I first got the phone I could and I changed it to transfer files. EDIT: No actually the setting that I changed was a developer option called "Default USB configuration" which I changed to transfer files but that still did nothing.
I just plugged in my phone and looked for the USB setting in the notification area but it wasn't there, but I noticed an option called "manage"
I went in there and noticed this. (see attachments) it's locked to be off and I can't change it. Very odd.
Click to expand...
Click to collapse
You're in notification settings. Try short tapping rather than long tapping to get the menu to pop up allowing you to select data transfer.
Changing default USB settings in developer options doesn't work for me either.
GoldElocks said:
You're in notification settings. Try short tapping rather than long tapping to get the menu to pop up allowing you to select data transfer.
Changing default USB settings in developer options doesn't work for me either.
Click to expand...
Click to collapse
My point is that the notification that normally comes up when you plug in your phone to a computer to change to data transfer, charge only ect ect isn't even coming up because the firmware is stopping that notification from coming up altogether and I can't change it so it does.
WAusJackBauer said:
My point is that the notification that normally comes up when you plug in your phone to a computer to change to data transfer, charge only ect ect isn't even coming up because the firmware is stopping that notification from coming up altogether and I can't change it so it does.
Click to expand...
Click to collapse
Almost certainly a cable or host port issue. Swap cables and see what happens. Same for hosts/host ports. You're not going to have toggling options if the phone does not 'see' all expected lines/pins.
I had the same issue and changed to a different cord to fix the problem.
You have an non certified cable it seems, I've confirmed this pixel 4a works with only certain cables for usb transfer, also the usb a to c cable you have will not charge the device as well.
Get a cable from know manufacturers like Samsung, it worked for me.
Yeah turns out it was a cable. Strange how my cable worked with my old phone but not with the Pixel 4a
Had this issue with my new 4a just now. Cable was fine, even used the new cable that comes with it using a Usb C to Usb A adapter. Nothing worked. Upon opening Device Manager I found a new device called 'Kedacom USB Device'. After trying random things, I decided to uninstall the current drivers by right clicking on it and clicking 'Uninstall device'. Suddenly the phone connected, and even showed the adb prompt.
So for anyone still facing this issue, hopefully this solution might help

Access Phone with broken Digitizer

The Touchscreen on my device is entirely unresponsive, which leads me to believe that the digitizer broke (the display is fine and i already tried disconnecting and reconnecting the displays ribbon cable). I already bought a new device but this old phone has some data that i would like to access. I have tried to connect both keyboards and mice to it but it seems to not accept USB connections before entering the password. I tried 2 OTG adapters that work on other devices but not with this one. I can't connect with adb either. is there a way for me to enter my password and gain access to my data?
The OPPO Find X2 Lite has OTG support. Keep trying.
ze7zez said:
The OPPO Find X2 Lite has OTG support. Keep trying.
Click to expand...
Click to collapse
i assumed that it supports OTG, but since my devices didn't connect i thought the phone might reject usb connections before it's unlocked. is this false? i also noticed that it supports otg 1.3 and 2.0, but my otg device is 3.0 . could that be the reason it didn't work?
*edit: it also connects the keyboard in recovery mode
i tried using OTG 2.0 and it didn't work either. predictable but still disappointing.
In order to use OTG you must enable it first in settings every time you want to use it, but with no digitizer you can't do it.. oppo messed up things by not doing this automatically or at least gave us the option to have it always enabled..

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