On Mon, 8 Jun 2015 19:57 Stefan G. Weichinger <lists@xunil.at> wrote:

Am 2015-06-08 um 20:25 schrieb J. Roeleveld:

> There was a similar thread here before about USB and suspend. Check
> that for specifics if in a hurry. Not at computer now to find the
> earlier email.

didn't find it yet .. but no hurry at all.

> Apart from kernel level USB suspend. There are settings in /sys/....
> where you can disable USB suspend on a per-device level.

.. as mentioned in:

https://wiki.gentoo.org/wiki/USB_Power_Saving

?

> I would assume Fedora disables that for keyboards and mice (think
> previous thread was about mice getting forgotten) when detected as
> such.

I browsed their udev rules and found some rules pointing in that
direction but none specifically matching the PCI ID of my keyboard and
the wildcards ... I am not sure.

But they seem to do it specifically, yes ->

# cat /sys/module/usbcore/parameters/autosuspend
2

# my keyboard
# cat /sys/bus/usb/devices/3-1.6/power/control
on

I assume it won't hurt much if I disable USB autosuspend in general for
now? Power savings should be minimal, right? (desktop here, AC etc)

Doesn't the powertop utility have a facility to do this per-device and to see what the current power-save settings are per-device? Surely a bit easier to use than directly messing about with udev rules?