Any news on this? Motivated by #862706 I kicked out my nvidia graphics card in my PC at home and gave Intel graphics a try, just to find out that I am struck by this problem again. Even worse, startx doesn't work, either. Installing and reinstalling xserver-xorg-legacy didn't help :-(.
Sorry to say, but my PC in the office (Testing) with proprietary nvidia driver installed is not affected. Regards Harri
