On Mon 2015-09-21 10:38:46, Alan Stern wrote:

On Mon, 21 Sep 2015, Pavel Machek wrote:

quoted

quoted

quoted

In fact, then, what you need seems to be the feature discussed by Alan
and me some time ago allowing remote wakeup do be disabled for runtime
PM from user space as that in combination with autosuspend should
address your use case.

That, plus they want the touchscreen to go into runtime suspend 
whenever the screen is off (was this not the main reason for the 
patch?).

It seems to me that it should be possible to arrange for this to happen 
simply by making userspace close the touchscreen device when the screen 
is turned off.  Or am I missing something?

Well... that's not what existing userspace expects. Your X windows
server will not close the touchscreen.

Surely that's a userspace issue, rather than a kernel problem?  The X
server does have some notion of power management and power savings; why
not extend that notion to include touchscreens?

Well... once upon a time, it was kernel job to mask differences
between different hardware platforms.

In a way, the hardware is "buggy" -- if your mouse clicked randomly
when you were not holding it in your hand it would be buggy... and it
would be nice for kernel to fix that "bug". 

								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html