On Tue, 2009-01-27 at 21:38 +0100, Jörg-Volker Peetz wrote:
> Michel Dänzer wrote:
> > On Sun, 2009-01-25 at 20:03 +0100, Jörg-Volker Peetz wrote:
> >> with kernel 2.6.28 and 2.6.28.1 while in X with active DPMS screen off
> >> ("xset
> >> dpms force off") the CPU does not go into C3 state when idle.
> >> With 2.6.27.10 and 2.6.27.12 the CPU does fall into C3 state when idle as
> >> observed with powertop 1.11.
> >
> > Was the DRI already enabled with the 2.6.27 kernels? If yes, you may
> > need to use git bisect to find the change that introduced the problem.
> >
>
> DRI was enabled both on 2.6.27 and 2.6.28.
>
> Today I also checked another hardware, a laptop with Pentium M CPU, Intel
> chipset ICH6, and ATI M22 [Mobility Radeon X300]. Similar behavior: while in X
> with active DPMS screen off ("xset dpms force off") there are nearly 60
> wakeups/s instead of 3 wakeups/s with DPMS disabled.
>
> I've not done a git bisect before. It will take me a while.
FWIW, I think it's most likely related to commit
0a3e67a4caac273a3bfc4ced3da364830b1ab241 ('drm: Rework vblank-wait
handling to allow interrupt reduction.') and friends. Can you try
reverting that and seeing if the problem still happens?
--
Earthling Michel Dänzer | http://www.vmware.com
Libre software enthusiast | Debian, X and DRI developer
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