After the upgrade to mesa 10.1.0-2 the file /usr/lib/libEGL.so.1 was removed so as not to conflict with blobs. This causes several applications (including evince and awesome, the window manager) to cease to function entirely, the exact error being "evince: error while loading shared libraries: libEGL.so.1: cannot open shared object file: No such file or directory". As I was using awesome as my window manager, restarting X failed entirely, leaving me with only ttys. This file is provided by mesa-libgl, nvidia-libgl and nvidia-utils, which all provide libgl. As nvidia-304xx-utils also provides libgl, trying to install any of these packages results in an error. A possible fix to this would be to create a symlink between /usr/lib/libEGL.so.1 and /usr/lib/mesa-libEGL.so.1.0.0 (and also for libEGL.so and libEGL.so.1.0.0). This file is provided by mesa and is the one used before to provide libEGL, so this should not introduce any new problems. This is the solution I am currently using on my system, and seems to work fine.