[Intel-gfx] [regression?] i915 generating wakeups even when idle

[Jesse Barnes]

On Tue, 7 Dec 2010 16:31:24 -0500
Andrew Lutomirski <luto at mit.edu> wrote:

> On Tue, Dec 7, 2010 at 4:03 PM, Andrew Lutomirski <luto at mit.edu> wrote:
> > Hi all-
> >
> > Somewhere between Fedora 13 (with 2.6.35, I think) and Fedora 14 +
> > 2.6.36.1, i915 started generating exactly 50 interrupts per second
> > (suspiciously equal to my refresh rate) when X is running.  I have the
> > Xorg driver 2.12.0 (specifically
> > xorg-x11-drv-intel-2.12.0-6.fc14.1.x86_64).  When I switch to a text
> > console but leave X running, the interrupts stop.
> >
> > Any ideas what to look at?
> 
> Quitting compiz fixes it.  Suspending compiz also fixes it.
> 
> If I turn on "sync to vblank" in compiz, I get wakeups.  If I turn it
> off, I don't get wakeups.  I'm having trouble reproducing this on
> nouveau, but I don't know if that means anything.

Sounds like compiz is always calling one of the vblank using GL
functions, even when idle?  Do you have any small apps running that
update continuously (e.g. terminal cursor, applet animations, etc)?

-- 
Jesse Barnes, Intel Open Source Technology Center