https://bugs.freedesktop.org/show_bug.cgi?id=56878
--- Comment #4 from miri@turboprinzessin.de --- If I read dmesg correctly, it defaults to agp mode 2 but the bug still appears with radeon.agpmode=1. Using radeon.agpmode=-1 avoids the freeze, though. agpmode=-1 will be slower than the default, won't it? Anything else I can do to help with fixing this bug?