[Bug 198669] Driver crash at radeon_ring_backup+0xd3/0x140 [radeon]

https://bugzilla.kernel.org/show_bug.cgi?id=198669

--- Comment #4 from roger@beardandsandals.co.uk (roger@beardandsandals.co.uk) --- Well it moved the problem. It crashed somewhere else in the driver with some message about scratch. Sorry I cannot tell you what is was because I screwed up the save of the the kernel message buffer, and now I cannot get the thing to glitch again. My normal method of stamping on the floor next to the system is not working. I think I might have overdone it and now the thing has bedded in. Going to leave it powered off overnight and try again in the morning.