Re: [PATCH][RFC] usbhid: enable autosuspend for internal devices

[Jiri Kosina]

On Mon, 29 Jun 2015, Oliver Neukum wrote:

> > Last time we were testing this, autosuspend for USB HID devices was quite 
> > a disaster.
> > 
> > Do you have any idea whether udev developers tested the "autosuspend on by 
> > default for USB HID devices" on reasonable set of devices?
> > 
> > The culrpits that I remember from top of my head (it's been long time 
> > ago):
> > 
> > - the LEDs for suspended device go off. This is very confusing at least on 
> >   keyboards, and brings really bad user experience
> 
> That is a bug. hidinput_count_leds() is supposed to prevent that.

This is a HW property and nothing kernel can do about. I am not saying it 
doesn't bring the LEDs up to a proper state again once auto-resumed. But I 
hate the LEDs going off a few seconds after I stop typing (i.e. once the 
keyboard gets auto-suspended).

-- 
Jiri Kosina
SUSE Labs
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/