DRI (3D acceleration) stopped working for me. The reason is simple (as revealed by looking at the Xserver log file): it was missing the DRI library for my graphics card.

So if 3D acceleration isn’t working for you anymore, try this:

aptitude install libgl1-mesa-dri

This package includes the library required for DRI on my Intel 915 graphics board. Not sure how it got lost, though. Maybe I purged it when trying to remove “unneded” packages from my system (in order to free up some space)… I tend to try to uninstall everything I don’t think I need.

P.S. Looks like you can now but ATI/AMD graphics again, given that they’re releasing specifications for their chips - reliable opensource drivers on the horizon!

I’ve fought both the Nvidia and old ATI driver hell - not having to do that was one of the main reasons why I wanted Intel graphics. Now ATI/AMD is back on my radar.