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?