https://bugs.freedesktop.org/show_bug.cgi?id=30227
--- Comment #10 from GhostlyDeath ghostlydeath@gmail.com 2011-12-10 09:24:52 PST --- Created attachment 54296 --> https://bugs.freedesktop.org/attachment.cgi?id=54296 Dmesg crash
This also occurs to me on my system, a PowerPC 7447A PowerMac G4 with an ATI Radeon 9800 Pro AGP (128MB). Using the packages from Debian Squeeze Backports (7.10.3) with a near-Vanilla 3.1.0 kernel with radeon DRM modules built in along with firmware.
However, for me it crashes about 10-20 seconds when glxgears is running, or it instantly crashes when I attempt to move or resize a window in WindowMaker.
Setting agpmode=-1 fixes the problem for me.