Red Hat Bugzilla – Bug 540476
RADEONHD:RS690:X1200:KMS very high Xorg CPU consumption after F11 -> F12 upgrade
Last modified: 2010-11-04 04:28:44 EDT
Created attachment 373115 [details]
Description of problem:
After I upgraded (with yum upgrade) from F11 (all updates) to F12, X started being very choppy, especially with window movements, etc. It's not clear to me whether this is an Xorg base, Xorg drivers or some other issue.
Version-Release number of selected component (if applicable):
Start X. Open some windows (e.g. Firefox), move them around, minimize/maximize, move mouse pointer between windows, etc.
From /var/log/rpmpkgs* I note that prior to F12 upgrade, I was using xorg-x11-drv-radeonhd-1.2.5-2.10.20090714git.fc11.i586 which is a bit older.
After the upgrade, the fonts used by (at least) Firefox changed -- they looked better (anti-aliasing?). This may be relevant.
Typical CPU usage when completely idle is usually between 20-30%. If I move my mouse pointer quickly between two open firefox browser windows, this reliably drives up the Xorg CPU consumption to over 90%. Automatic window refocusing (without clicking) is enabled.
The system is almost unusable with this CPU consumption.
Update: I also tried xorg-x11-drv-radeonhd-1.2.5-3.14.20090918git.fc12, no difference.
I set radeon.modeset=0 when booting, the usability was restored. Steady state Xorg CPU is 6-7% and I can get it (only) up to 38% but no higher by fast-moving mouse pointer between windows.
Created attachment 373174 [details]
Xorg.0.log when radeon.modeset=0
This worked for me too, which is good, because in addition to the desktop being messed up six ways from Sunday, the textures in openarena were. . .interesting. All is totally fine on the radeon driver with radeon.modeset=0.
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