I've checked out Karmic Alpha 3 with Kubuntu using Mesa 7.5 and (I
think) Intel video drivers 2.8.0. There is no more high CPU usage for
idle Xorg. % CPU being used hovers between 0-1%.
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[i965] Kubuntu: High %CPU/Power Usage unless downgrade to 2.4 (UXA/EXA)
Using UXA with Intel 2.7.1 drivers and libdrm 2.4.9, I have reduced
power consumption (13 W) and Xorg in the 2-5% range on idle. 3D
performance is much higher (faster than it ever was), though it's not
reflected in glxgears. There is the X freeze bug every few hours or so,
though.
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[i965]
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