Re: usbtouchscreen - runtime PM patches testing [Was: [PATCH 1/2] Input: usbtouchscreen - add support for ET&T TC4UM touchscreen controller]

[Oliver Neukum <oneukum@suse.de>]

Am Mittwoch, 14. Juli 2010, 12:43:27 schrieb Petr Štetiar:
> Oliver Neukum <oneukum@suse.de> [2010-06-30 15:04:51]:
> 
> Hi,
> 
> > 1. indeed a few suspend & resume cycles
> 
> it seems to work, although I've tested it with the suspend to RAM only with 
> 'echo devices > /sys/power/pm_test', the complete suspend doesn't work on my
> laptop. I hope it's enough. If the whole cycle is necessary I can try to test
> it on 
> 
> I was testing it with 'cat /dev/input/touchscreen | od -x' and without your
> patches the device dissapeared after the resume cycle. With your patches it was
> still working fine after 5-6 suspend and resume cycles.

This is enough. Thank you.

> > 2. to know what happens if you switch runtime power management on with
> > echo "auto" >/sys/bus/usb/devices/$DEVICE/power/level
> 
> Sorry my ignorance, but what should happen? I don't follow PM stuff that much.
> I've enabled auto and the touchscreen is still working and nothing has
> changed, is it ok?

This is quite good already. Ideally in the /sys/bus/usb/devices/$DEVICE/power
directory active_duration should grow slower than connected_duration.

	Regards
		Oliver
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