On Thu, 2009-01-29 at 20:04 +0100, Jörg-Volker Peetz wrote: > 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
Thanks for taking the time to confirm this! I think this may actually be an X driver issue though; apparently it's telling the kernel that the CRTC is disabled, but the CRTC is obviously still generating vertical blank interrupts. > xserver-xorg-video-radeon 1:6.9.0-1+lenny4 Can you try if the problem persists with current xf86-video-ati Git or at least the 6.10.0 release? If so, does disabling the radeon_crtc_modeset_ioctl() calls in legacy_crtc_dpms() in xf86-video-ati/src/legacy_crtc.c avoid the problem? (Alex, do you know or can you find out under what circumstances exactly the CRTC frame counter registers reset to 0?) -- Earthling Michel Dänzer | http://www.vmware.com Libre software enthusiast | Debian, X and DRI developer ------------------------------------------------------------------------------ This SF.net email is sponsored by: SourcForge Community SourceForge wants to tell your story. http://p.sf.net/sfu/sf-spreadtheword -- _______________________________________________ Dri-devel mailing list Dri-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/dri-devel