Bug#523385: xserver-xorg-core: xserver 1.6.0 eats CPU when moving windows

[Damien Grassart <damien@grassart.com>]

I am also experiencing this issue after upgrading Xorg and radeonhd today. Like Yannick I am not showing any write-combining entries in /proc/mtrr, but unlike him I am not having any problems with regards to memory modules. My /proc/mtrr is showing:

reg00: base=0x100000000 ( 4096MB), size=  512MB, count=1: write-back
reg01: base=0x120000000 ( 4608MB), size=  256MB, count=1: write-back
reg02: base=0x000000000 (    0MB), size= 2048MB, count=1: write-back
reg03: base=0x080000000 ( 2048MB), size= 1024MB, count=1: write-back
reg04: base=0x0c0000000 ( 3072MB), size=  256MB, count=1: write-back
reg05: base=0x0cff00000 ( 3327MB), size=    1MB, count=1: uncachable

I am fairly sure I had a write-combining entry in there before. Is the new version not adding a proper mtrr entry for the framebuffer?

Thanks,
-Damien