[mythtv-users] How To Prevent Disabling of USB Devices When Idle

Stephen Worthington stephen_agent at jsw.gen.nz
Sat Sep 30 22:59:10 UTC 2017

On Sat, 30 Sep 2017 15:51:17 -0700, you wrote:

>On 09/30/2017 05:47 AM, Stephen Worthington wrote:
>> On Fri, 29 Sep 2017 14:42:26 -0700, you wrote:
>>> I have an Intel NUC 7I5BNH as a frontend.  I use an IO Gear wireless
>>> keyboard/mouse with it.  The interface to the frontend is a USB dongle.
>>> When the frontend is idle for enough time, the screen saver kicks in.
>>> Usually, pressing a key or moving the mouse (trackball) will wake up the
>>> frontend.  However, if more time passes by, the frontend kernel goes to
>>> sleep too, and no amount of key pressing or mouse moving will wake it
>>> up.  I suspect that the kernel is disabling the USB keyboard/mouse
>>> wireless dongle.  Is there some way to prevent this?
>>> Ubuntu 14.04.
>>> Jay
>> Have you checked your BIOS settings?  The wakeup sources are often
>> configured there.

>Looking at the BIOS settings for the USB, nothing pops out at me.  There 
>is an "USB Legacy" option (enabled) and a Portable Device Charging Mode 
>option (Charging in S3/S4/S5).  Other choices are "Off" and "Charging 
>Only".  Other than that, only an Enable/Disable for each USB port (all 

That does not sound like the correct place in the BIOS to be looking.
There is usually a section where you set the wakeup options, selecting
the things that will wake up the PC when in a low power state.  It
should include things like Ethernet as well as keyboard and mouse.

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