[Bug 44800] Radeon HD 6450 CAICOS screen corruption and kernel crashes

https://bugs.freedesktop.org/show_bug.cgi?id=44800

--- Comment #7 from Michel Dänzer michel@daenzer.net 2012-01-16 03:23:43 PST --- The panic backtrace doesn't look obviously related to the radeon driver — all the symptoms sound like something might be scribbling more or less randomly over memory.

I wonder if the line

mtrr: type mismatch for e0000000,10000000 old: write-back new: write-combining

in dmesg might be relevant. Can you try resolving that, e.g. using https://linuxindetails.wordpress.com/2010/06/27/mtrr-type-mismatch-for-e0000... and see if that helps? Might be interesting seeing the contents of /proc/mtrr before and afterwards (if it changes).