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

[Jay Foster]

On 09/30/2017 05:37 PM, Nick Morrott wrote:
> On 29 September 2017 at 22:42, Jay Foster <jayf0ster at roadrunner.com> 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?
> Disabling power saving of individual USB devices is possible (and
> necessary with some IR receivers too, IME).
>
> You can follow a clear write-up here:
>
>    http://hamwaves.com/usb.autosuspend/en/index.html
>
> It boils down to poking power/control for the correct USB device
> (under /sys/bus/usb/devices) and changing its status from 'auto'
> (kernel can autosuspend the device) to 'on' (device is always on).
>
> It may also be necessary to ensure that utilities like
> laptop-mode-tools and powertop are not overwriting settings you are
> manually applying.
>
> Cheers,
> Nick
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When I checked the power/control setting for the keyboard/mouse USB 
device, it was already set to "on" and the problem still happens.  I 
have added setting "usbcore.autosuspend=-1" on the kernel boot command 
line as described here 
(https://unix.stackexchange.com/questions/91027/how-to-disable-usb-autosuspend-on-kernel-3-7-10-or-above). 
I hope this will help.