Regarding my comment in #7, I've been running for the last 4 days without problems after disabling KMS (radeon.modeset=0).
So I'm inclined to agree that the problem is down at the kernel level rather than in the driver itself.
Regarding my comment in #7, I've been running for the last 4 days without problems after disabling KMS (radeon.modeset=0).
So I'm inclined to agree that the problem is down at the kernel level rather than in the driver itself.