Re: [RFC PATCH] PM / Runtime: runtime: Add sysfs option for forcing runtime suspend

[Alan Stern]

On Mon, 21 Sep 2015, Pavel Machek wrote:

> > > 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?

> ..and it would be nice to have enough hardware abstraction in the
> kernel so that X can be used on phones...

What -- not Wayland?!  :-)

Alan Stern

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