I am also affected by the flashes on the screen on my Dell Latitude Z600
since I upgraded to Lucid 64bit. Here are the details of my video card :
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 07)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 07)
00:02.0 0300: 8086:2a42 (rev 07)
Subsystem: 1028:02c8
00:02.1 0380: 8086:2a43 (rev 07)
Subsystem: 1028:02c8
The workaround i915.powersave=0 fixes the issue.
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[Intel GM45] Irregular sync flashes (Lenovo T500, Dell Insp. 1545)
https://bugs.launchpad.net/bugs/538648
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