I want use the 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.
Can anyone help figure this out ?
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 receive power From it. If I use a standard usb2 to micro usb cable with a USB2 to USB-C adapter could this stop the phone discharging issue ?
My phone is Rooted if that helps.
This is exactly what is happening to me using a LG G6 and ifi DSD micro black. You change it to anything other than power supply it just reverts instantly to power supply and as you said drains the hell out of the battery.
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I want to have S2 with usb keyboard, mouse, (probably a pendrive/hdd also), and a hdmi screen connected while charging the battery. My question is, what cables/adapter and usb hubs would I need to achieve the desired configuration?
As far as I know, what you want isn't possible. The MHL/HDMI and USB are mutually exclusive -- they share a connector, and when the MHL/HDMI adapter is plugged in, the connector switches into MHL mode, and the USB data pins are re-purposed.
you can't, maybe a bluetooth mouse/keyboard will solve part of the problem. And maybe you can use a powered hub to use them together, but not with HDMI
The phone differentiate MHL, USB,USB jig, and charging mode (AC vs dc) via resistance between two of the connector pins on the cable. So one mode at a time.
Sent from my GT-I9100 using Tapatalk
I bought a micro USB (M) to USB (F) adapter so I could plug in my XBOX PC wireless game receiver into my LTEVO, which is intended to allow me to use my Xbox 360 wireless controller with my phone. However, the wireless receiver will not power up when I plug it into my phone. It works when I plug it into my PC, so I know the receiver is not the issue.
Is there a setting that I need change on my phone in order for the receiver to get power? Or do I need a different adapter in order for this to work? I've seen them work on the Youtube videos, so I know this is possible. I appreciate your assistance!
I don't think the microusb port supplies power to external devices??? Or if it does it may not provide enough to power the adapter. I believe that is why if you buy the MHL adapter for HDMI it only works if you plug your charger into it to supply power.
cruise350 said:
I don't think the microusb port supplies power to external devices??? Or if it does it may not provide enough to power the adapter. I believe that is why if you buy the MHL adapter for HDMI it only works if you plug your charger into it to supply power.
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Valid point, however, check out all these Youtube videos showing the adapter/receiver working without external power:
http://www.youtube.com/watch?v=_pE1rJ5nKYI
I think for that to work the device needs to have USB-host capability (and have that capability enabled.) I don't know if the LTEVO has this, but I kinda suspect that it doesn't.
Hey guys,
I'm using my tablet in my car and have it connected to a Kenwood radio which has two USB ports. The radio can recognize the android device and changes automatically to USB as an input and then my steering wheel controls don't work anymore.
So as a workaround I bought an USB adapter which only connects the power pins. But with this adapter, the tablet is not charging. The cable itself is working as intended with another phone, so it has to be something special about the tablet.
Does anybody know if there is a way to use a data connection via USB to only give power to the Z2 tablet?
Man, somtimes I'm just an incredible idiot. The Xperia Z2 Tablet has a dedicated charging port at the bottom for which I already have a cable. So, I'm going to use that.
Sometimes the solution is so damn obvious
Another bug i noticed is the OTG. I noticed that there is a limit in terms for power draw a USB-C OTG device can receive from the USB-C port of the Mate 20 Pro. USB Power automatically shutsdown depending on a certain current draw and the scenario is somewhat random. This error has been persistent until now with the current version of the F/W (.126)
Although from the phone notification, "Supplying power to the connected device over USB" is present, you will notice from the LED indicator of device attached to the USB port shuts down right after you plug it. If you attempt to re-plug it, usb power is randomly restored.
I am using a USB-C usb hub with HDMI port as the OTG device. I tested this device with another phone (P10, Samsung, etc), power is stable.
I actually have the some problems reading my otg with a USB drive connected. The connection is intermittent. Sometimes it can read the drive and sometimes it can't. I tried it on my P20 Pro and it's working fine. It will be great if others can try it out and review it here.
I'm on version 9.0.0.183 (patch05). Thanks
No otg problem hdmi desktop mode
I am on emui 9.0.0.198 and I have no problem connecting my television through hdmi without extra power. Although at first the connection failed (tv screen showing red stripes and intermittently switching to black screen) and I had to change hdmi cable. Desktop mode worked fine after that hdmi replacement. Maybe just hdmi does not draw much power.
Mate 20 pro.
I bought a usb-c to hdmi cable, it connected to my new LG PC monitor a few times with no problems. But recently (no sure when or why) it will not connect to the monitor but it will connect fine to my Samsung series 7 TV.
The phone notification says the phone is supplying power to the usb device.
I have a ugreen 16gb USB/usb c flash that I used to use on my p20 lite and it worked fine. I tried it with my mate 20 pro and it does not work. I also have a hdmi/usb c for desktop mode and that works with no issue.
I purchased USB c / female USB adapter and when I plug in my OTG USB memory (that does not work when plugged into the phone) now works perfectly.
Hi,
I've seen this thread which may be related: https://forum.xda-developers.com/showthread.php?t=3866913
I have a Mate 20 Pro linked to a Dragonfly Red DAC using an OTG cable from the USB C port. Regardless of music playing app (e.g. USB Audio Player Pro, TIDAL) the music cuts out periodically due to failing to detect the connected DAC. Sometimes it re-detects and re-initialises successfully, other times it requires unplugging the dac and reconnecting.
The phone's USB C port has behaved fine for charging and data transfer when connected to a computer
The Dragonfly DAC has behaved fine when plugged directly into computer's USB port.
This could be a physical defect/connectivity issue in the OTG cable (I don't currently have a spare to test with) or it could be an issue with the phone shutting down the USB device. My immediate suspicion related to power/battery management but having ploughed through the settings I can't see anything obviously relevant.
I plan to try:
- another OTG cable
- testing with the phone battery fully charged
- testing with the phone's battery explicitly set to 'High Performance'
Anyone seen this/anything similar?
Thanks.
This is happening to me also with the same phone.
Its not the cable.
Apparently this phone has an issue with the USB driver.
I just brought Fiio KA3 usb DAC i am using POCO F1 with Oxygen OS ....
1st day i didn't encounter anything like this but now its happening after 5-7 mins every time it disconnected and reconnect automatically...
rbrierle said:
Hi,
I've seen this thread which may be related: https://forum.xda-developers.com/showthread.php?t=3866913
I have a Mate 20 Pro linked to a Dragonfly Red DAC using an OTG cable from the USB C port. Regardless of music playing app (e.g. USB Audio Player Pro, TIDAL) the music cuts out periodically due to failing to detect the connected DAC. Sometimes it re-detects and re-initialises successfully, other times it requires unplugging the dac and reconnecting.
The phone's USB C port has behaved fine for charging and data transfer when connected to a computer
The Dragonfly DAC has behaved fine when plugged directly into computer's USB port.
This could be a physical defect/connectivity issue in the OTG cable (I don't currently have a spare to test with) or it could be an issue with the phone shutting down the USB device. My immediate suspicion related to power/battery management but having ploughed through the settings I can't see anything obviously relevant.
I plan to try:
- another OTG cable
- testing with the phone battery fully charged
- testing with the phone's battery explicitly set to 'High Performance'
Anyone seen this/anything similar?
Thanks.
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If you found any solution please shair