[Bug 68571] GPU lockup on AMD Radeon HD6850 with DPM=1

https://bugzilla.kernel.org/show_bug.cgi?id=68571

--- Comment #81 from Weber K. weberkai@yahoo.com.br --- I think so as well...

Anyway before, I had to put this in kernel parameters, or else, black screen and hang up during boot: radeon.dpm=0

And since I put this in grub.cfg and fstab, never had a black screen again: rootflags=relatime,lazytime,commit=60 iommu=noagp radeon.dpm=1

I don't understand why, but it worked... I have pcie XFX HD6850 AMD 1055T FOSS drivers, kernel 4.4.14 .

Maybe it could help you to troubleshoot this error too. I think it's worth a try, if you have spare time.

If this don't help you... Then I'm sorry...