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Poor glxgears perfomance with unstable and radeon 7500



Hi,
I can't achieve to get good performance from my ati radeon 7500.
All should work fine but, when running glxgears, the gears are rotating really slowly.
Here are the output :
> glxgears
8036 frames in 5.0 seconds = 1607.024 FPS
8043 frames in 5.0 seconds = 1608.572 FPS
8036 frames in 5.0 seconds = 1607.084 FPS
8038 frames in 5.0 seconds = 1607.485 FPS
8048 frames in 5.0 seconds = 1609.462 FPS
8046 frames in 5.0 seconds = 1609.169 FPS

what is surprising me is that glxinfo says DRI is working :
> glxinfo
name of display: :0.0
display: :0  screen: 0
direct rendering: Yes
...

I don't understand what's going on...
Please help !

Jean-François



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