Android / USB devices keep connecting and disconnecting on R7

scrambler

My daughter has an R7, and she is having a weird problem with the USB ports on it.

No android device can stay connected. As soon as you plug it, it makes the connect sound then the disconnect sound and keeps cycling between connecting and disconnecting.

 

It is not related to the device as I have tried two different phones and one tablet all with different cables, all work fine on other computers. And I tried on the three available USB ports of the laptop, all behave the same.

 

Searching online I found a lot of people with similar issues mostly unresolved. I did disable the USB suspend option in the power options without any results, as well as uninstall all USB hub so they would be reinstalled at boot time, and installed all optional windows updates.

 

She is also experiencing another issue on her USB ports, we have a Samsung slim external DVD player that uses a Y USB cable for data and power that also works fine on any other machine. On her R7, when playing a Video, the video keeps making blocks at regular intervals like something is preventing the full data stream. Wondering if this is related.

 

Apart from that, USB mouse, USB keys or external USB drives appear to work fine.

 

Anyone with a similar issue and a definitive fix?

 

 

scrambler

Thanks, but I seem to have found a solution to both issues.

 

1) Regarding the android devices that kept disconnecting and reconnecting, after reading the thread below

https://support.microsoft.com/en-us/kb/2900614

 

I checked what registry keys were present on my wife's surface pro3 for

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB\VID_XXXX&PID_XXXX\YYYY\Device Parameters

 

and found that there was three DWORD values in there that were not present on the R7

SelectiveSuspendEnabled
EnhancedPowerManagementEnabled
DeviceSelectiveSuspended

 

So I added these 3 DWORD and set them all to zero (disabled), and the issue is gone. You may not need the three of them, but I have not tested them one at a time yet.

 

2) For the External DVD blocky playback, it turned out to be quite trivial. Someone had enabled hardware acceleration in the VLC player settings. I reset all the VLC settings, and it worked fine from there.

 

Hope this can help others

 

-Justin

scrambler,

 

The only thing I can think that might be happening is that too much power is trying to be drawn through the USB port(s). Does the issue present itself when the external device has it's own power source plugged into it, by chance? It looks like the output current for the USB ports is 1.5A.

scrambler

Thanks, but I seem to have found a solution to both issues.

 

1) Regarding the android devices that kept disconnecting and reconnecting, after reading the thread below

https://support.microsoft.com/en-us/kb/2900614

 

I checked what registry keys were present on my wife's surface pro3 for

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB\VID_XXXX&PID_XXXX\YYYY\Device Parameters

 

and found that there was three DWORD values in there that were not present on the R7

SelectiveSuspendEnabled
EnhancedPowerManagementEnabled
DeviceSelectiveSuspended

 

So I added these 3 DWORD and set them all to zero (disabled), and the issue is gone. You may not need the three of them, but I have not tested them one at a time yet.

 

2) For the External DVD blocky playback, it turned out to be quite trivial. Someone had enabled hardware acceleration in the VLC player settings. I reset all the VLC settings, and it worked fine from there.

 

Hope this can help others