Reporting as requested by
The radeon driver in xorg-x11-drv-ati-6.6.3-4.fc7 wakes up 60 times a second
when not doing anything. It looks like there is a patch floating around which helps:
That patch will break any attempt to sync swaps to vblank.
The right fix is more like "only enable the vblank interrupt when a buffer swap
request comes in that wants it".
I think this should be in rawhide and working already... can you re-test it please?
OK, installed xorg-x11-drv-ati-6.6.193-2.fc8 from the development repo, but when
X is running the ATI Radeon card still generates 60+ wakeups a second. I will
attach the xorg.conf and Xorg.log as well if that helps.
Created attachment 180081 [details]
Created attachment 180101 [details]
you need a new kernel I just realised as well, this stuff is only gone upstream
for 2.6.23, radeon drm 1.27 isn't new enough to support this..
OK, I upgraded to kernel-2.6.23-0.74.rc2.git1.fc8 and now the system generates
about 45 wakeups/second sitting at the GDM login screen instead of well over
100. Looks a lot better!
Wakeups-from-idle per second : 46.0
Top causes for wakeups:
41.4% ( 18.3) at-spi-registry : schedule_timeout (process_timeout)
30.1% ( 13.3) Xorg : do_setitimer (it_real_fn)
6.0% ( 2.7) <kernel core> : clocksource_register (clocksource_watchdog)
3.0% ( 1.3) ip : tg3_open (tg3_timer)
3.0% ( 1.3) ntpd : schedule_timeout (process_timeout)
3.0% ( 1.3) <kernel core> : queue_delayed_work_on (delayed_work_timer_fn)
The next one on the list is known bug #227476.