For the benefit of others who find their way here via Google, here's the
smallest workaround I've found so far:
* Use dexconf to generate a minimal xorg.conf
* Edit xorg.conf and make the following changes:
- Change Driver "vesa" to Driver "intel" in Section "Device"
- Add the following lines between Device "Configured Video Device" and
EndSection, in Section "Screen":
Subsection "Display"
Depth 16
Modes "1152x864"
EndSubSection
Use whatever you want your maximum screen resolution to be instead of
1152x864.
I don't really understand why this works, since Xorg.0.log tells me the
driver is forcing depth 16 and bpp 16 regardless of whether the above
subsection is included in xorg.conf or not, but hopefully this will be a
Clue to whoever ends up actually fixing this bug.
Also not sure whether this is what Arnie-75 did, but I get no odd video
artifacts as long as I leave Visual Effects set to None. This box (Dell
OptiPlex GX110) tells me "Desktop effects could not be enabled" at
resolutions over 1024x768; at or below that resolution, they enable but
they're too broken to use (mouse leaves chunks of background in its
wake, window animation very slow and jerky, occasional corruption of
window title bars). But that's all a completely different bug.
--
glxgears and screensavers causes horizontal line corruption, freezes on i815
chipset
https://bugs.launchpad.net/bugs/214168
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