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At rebooting my Lenovo ThinkPad T420s after the recent updates coming last Friday (not sure), I got severe graphical problems: could almost not use unity.

I switched from Intel to Nvidia and loaded the restricted driver. Then I saw some more updates coming and applied them.

When I switched back to Intel graphics (integrated), I got only Unity 2D. So no 3D any more on Intel.

Any hints other than waiting for another update that fixes the issues?

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Did you remove the restricted drivers and the xorg.conf generated for them? – Bruno Pereira♦ Jan 24 '12 at 10:23
Not explicitly, but I tried to clean up with: $ sudo apt-get purge xserver-xorg $ sudo apt-get install xserver-xorg xserver-xorg-video-all $ sudo reboot (from hint in askubuntu.com/questions/79403/…). It looks like it tries unity 3d at login but backs down to unity 2d. – Dag Rende Jan 25 '12 at 7:26

1 Answer

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Probem solved: I had power tuned my ubuntu with the hint in http://ubuntuforums.org/showthread.php?t=1872633. But some of the packages installed in that instruction interfered with the kernel or intel driver update, and 3d stopped working. When I removed the PPA-sources and packages in the article above and rebooted, 3d worked again.

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