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

[Andrew Lutomirski]

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.

--Andy