Comment # 1 on bug 93050 from Michel Dänzer

I also get the I/O page faults with my Tonga, but AFAICT only when it's the
primary GPU, not when it's the secondary one. Also, the ring test doesn't fail
and acceleration works fine for me in either case, so I think the I/O page
faults and the ring test failure are two separate issues and should be tracked
separately.