Comment # 26 on bug 84500 from Erich Seifert

I'm also getting "Packet0 not allowed!" messages with a Radeon HD 7770 (Cape
Verde XT) video card on kernel 3.17.0 and 3.17.1.
I experienced several random crashes with 3.17.0, but I'm not sure they are
related to this problem yet. I'll apply the patch and report back soon.