Zkus se pohrabat v xorg.conf. Takhle to mám já:
Section "Device"
Identifier "ATi Radeon HD3200"
Driver "radeon"
Option "AccelMethod" "EXA"
Option "ClockGating" "true"
Option "DynamicPM" "true"
Option "EnablePageFlip" "true"
EndSectionviz man 5 xorg.conf, man 4 radeon
taky bys mohl zkusit updatovat nějaké balíčky na verzi z experimentalu (libdri*,*mesa*,xserver-xorg-video-radeon)
tady bych ti doporučil seznámit se s pinningem (viz man apt_preferences); příklad:
Package: *
Pin: release a=unstable
Pin-Priority: 980
Package: *
Pin: release a=experimental
Pin-Priority: 200
Package: xserver-xorg-video-radeon
Pin: version *
Pin-Priority: 980
Package: xserver-xorg-video-ati
Pin: version *
Pin-Priority: 980
Package: libgl1-mesa-dev
Pin: version *
Pin-Priority: 980
Package: libgl1-mesa-dri
Pin: version *
Pin-Priority: 980
Package: libgl1-mesa-glx
Pin: version *
Pin-Priority: 980
Package: libglu1-mesa
Pin: version *
Pin-Priority: 980
Package: mesa-common-dev
Pin: version *
Pin-Priority: 980
Package: mesa-utils
Pin: version *
Pin-Priority: 980
Package: libdrm2
Pin: version *
Pin-Priority: 980
Package: libdrm-intel1
Pin: version *
Pin-Priority: 980
Package: libdrm-radeon1
Pin: version *
Pin-Priority: 980
Package: libdrm-dev
Pin: version *
Pin-Priority: 980
Package: libdrm-nouveau1
Pin: version *
Pin-Priority: 980
Nezapomeň, že glxgears není žádný benchmark!