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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…). It looks like it tries unity 3d at login but backs down to unity 2d. – Dag Rende Jan 25 '12 at 7:26

Probem solved: I had power tuned my ubuntu with the hint in 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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