I guess that coincides with your refresh rate:
(**) R128(0): *Driver mode "1024x768": 94.5 MHz, 68.7 kHz, 85.0 Hz
Please run "xrandr --verbose" to verify the current rate.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Assignee: (unassigned) => Tormod Volden (tormodvolden)
Status: New => Incomplete
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r128 driver wakes up too often (85/sec at idle)
https://bugs.launchpad.net/bugs/150078
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