KDE 4.2 Problems

Today, I decided to upgrade my mixed Debian Squeeze/Sid box to KDE 4.2.2. Unfortunately, whenever I tried to boot into KDE with two monitors attached using radeonhd, kwin repeatedly crashed. I found the following error in the .xsession-errors log file:

kwin: ../../src/xcb_io.c:542: _XRead: Assertion `dpy->xcb->reply_data != ((void *)0)' failed.

I eventually figured out (after several hours of debugging) that the libGL.so.2 on my system was the one provided by the closed source fglrx / Catalyst driver and *not* mesa. A quick

sudo aptitude reinstall libgl1-mesa-glx

and everything works great.

Posted in the hopes that the next guy with this problem finds it and saves a few hours of googling.

Josh