Comment 129 for bug 38131

I’ve noticed a similar problem, but under slightly different circumstances, everything runs fine (Firefox, videos etc.) and typically the Xorg process is always less that 10%.

My problem occurs when a seconds user logs on, for example the screen saved comes on, my gf clicks “switch user”/“change user” or whatever its called, she logs in and the CPU usage of Xorg process shoots through the roof, especially when using Firefox.

My setup is as below:

OS: Ubuntu 9.10 (Karmic)
CPU: AMD Athlon 64 3200+ (Venice/San Diago Core)
Memory: 2GB PC3200 Corsair
Video Card: ATI X1800 (R520)
Driver: Open Source radeon (NOT radeonhd)

I’ve tinkered with some of the Xorg.conf settings, and if I set the AccelMethod to the older XAA mode instead of EXA, the problem doesn’t exhibit itself. Unfortunately I cannot play videos using XAA mode.

I’m guessing it’s a problem with the open source radeon driver and EXA Accel method (in my case at least).