I spent some more time on this bug. Here are some updates:
libgl1-mesa-dri 7.9~git20100924-0ubuntu2 doesn't have the bug
libgl1-mesa-dri 7.10.2-0ubuntu has the bug.
It turned out that the patch by Henri Verbeet (mentioned above) is only
for i915.
I've built libgl1-mesa-dri from source and applied the patch.
My chipset is i965 so it didn't make any difference for me.
I found a temporary work-around:
In /etc/X11/xorg.conf, I disable DRI this way:
Section "Device"
Option "DRI" "False" ### This solves the issue
Identifier "Card0"
Driver "intel"
VendorName "Intel Corporation"
BoardName "4 Series Chipset Integrated Graphics Controller"
BusID "PCI:0:2:0"
EndSection
Of course, I lose most desktop effects, but at least I get KDE back.
Displays aren't upside-down anymore.
This is a serious regression in Natty.
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https://bugs.launchpad.net/bugs/781353
Title:
libgl1-mesa-dri: display inverted (upside-down) in startkde after
natty upgrade
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