Hello. I have my new HM9 connected to the OPPO HA2 DAC/amplifier via OTG micro USB-TYP C cable, and no matter what I do, I can't prevent the phone to do reverse charging to the DAC. Whichever mode I select it goes back to reverse charging. Any thoughts? I activated a different mode within the developer options, but I gets back to reverse charging on the main screen, even when it says otherwise (whichever option) in the developer options...
Thanks!
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Firstly, I'm asking on behalf of a friend (saves him signing up) so I don't know all the details
Anyway... I recently gave him a Car USB charger (I had one lying around) which I tested out in my car using my HTC Desire HD....just to make sure it worked...& it did
(not sure but I THINK the cable I use is a standard USB to MicroUSB cable - not sure if it's a 'Data/Charging' or just 'charging' though)
However, when he tried to charge his Samsung phone (sorry don't know which one) it didn't
(BTW he is using his own cable he had lying around)
He tells me that he plugs in the cable between car USB charger & the phone - the screen brightens, but the charging indicator doesn't 'animate' & after a few second the screen then dulls back down into standby
Now I suspect that perhaps it's the cable - but he assures me that the cable he used worked on the PC. making me think it's a Data/charging cable
I know there's a difference between 'Charging only' cables and 'Data/Charging' cables, something about a couple of pins may not be connected but onto my question.....
[Q] IF he was using a 'Data/Charging' cable on the car charger
- would his phone assume it's being connected to a PC & automatically go into 'data connection mode' but then (because there's no data) the screen then 'dulls' back to standby mode ??
- If so, why won't the phone go into 'Charge only' mode if it doesn't see any data signal instead ??
BTW On my HTC - if it sees data connection I get a popup asking what mode I'd like (if unlocked) but it automatically goes into 'charge' mode if it's locked - I'm thinking his Samsung does the opposite when 'locked'... going into 'data mode' instead
Thanks in advance
I want use the LG V30 as a streaming audio device and connect it to my HiFi setup via external DAC - audiolabs mini M-DAC.
This DAC has an PC/Android OTG micro USB port for connectivity and also a built in battery for optional portable use. I leave the DAC plugged into power and don’t use it as a portable device.
When I connect the V30 to the audiolabs mini M-DAC using a standard USB-C to micro USB cable the phone goes into USB “Power Supply” connection mode. Although the audio works fine with the DAC using the USB Audio Player Pro app it rapidly depletes the phone battery.
I have tried to manually switch the USB connection mode to “Charging” and others but it just reverts back to “Power Supply” connection mode.
Can anyone help figure this out ?
I don’t think this issue is limited to V30 phone and no one in the V30 thread has been able help with it. For this reason I’m trying the general QA.
I’m guessing the issue is to do 2 way charging offered by USB-C port. Ideally I would like the phone to be able connect to the DAC and draw power from it or at least remain passive.
My phone is Rooted if that helps.
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
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
It goes like this. I have tried 3 type-c cables and they are all fine when I connect it to my wife's phone to my pc. And when I try these cables, connecting my phone to my pc, the menu or the default usb menu on my phone does not show up. The options where we need to select one, like, the file transfer, usb tethering, transfer photo, midi. It even won't detect any kind of external usb or OTG drive. My usb debugging mode in the developers option is also ON. I am wondering, if my phone needs to replace the charging board or an update or re-firmware can do the fix. Thus, I have done a hard reset and factory reset, but, still nothing happens.
Can anyone know what the issue could be? For the one's who had experienced this? Tia
Look inside here:
How to Turn On/Off USB-OTG - Xiaomi Manual | TechBone
Turn On/Off USB-OTG - Xiaomi:
www.techbone.net
jwoegerbauer said:
Look inside here:
How to Turn On/Off USB-OTG - Xiaomi Manual | TechBone
Turn On/Off USB-OTG - Xiaomi:
www.techbone.net
Click to expand...
Click to collapse
Thanks for the reply. But, sorry my Xiaomi Mi 10T does not have that OTG on & off switch.. It would just automatically connect if a usb is inserted. My usb debugging is also on, but, it cannot detect the inserted usb drive.