Michel Dänzer wrote:
> 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?
>
You were right. I did the "git bisect good 2.6.27 bad 2.6.28" and the outcome is
0a3e67a4caac273a3bfc4ced3da364830b1ab241 is first bad commit
commit 0a3e67a4caac273a3bfc4ced3da364830b1ab241
Author: Jesse Barnes <[email protected]>
Date: Tue Sep 30 12:14:26 2008 -0700
<snip>
:040000 040000 6693836add0abd0b32db5f43d8c17d55942e2668
f7bd6a7e56d54686ae9fc6dffb3c2af7358dd787 M drivers
:040000 040000 87727cb4e9481ec26a9f950a1165589b98e924a2
204fcec78ac96cf9d591527cebbc5f95367bea9c M include
My system is
Debian 5.0 (lenny)
libc6 2.7-18
gcc 4.3.2-1.1
libgl1-mesa-dri 7.0.3-7
libdrm2 2.3.1-2
xserver-xorg-video-radeon 1:6.9.0-1+lenny4
To measure the wakeups I used powertop 1.11
--
Best regards,
Jörg-Volker.
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