Comment 6 for bug 1058303

It looks like one of the commits in the radeon driver that is included in the 3.2.0-31.50 Ubuntu kernel has been recently reverted upstreams. This commit (985f61f7ee647ad570c05eab0b74915da2ac8e19 "drm/radeon: rework pll selection (v3)") seems to cause some regressions.

This may not be related with this bug report, but I'm building a test kernel with this commit reverted so that you can test. I'll post the link here once the build is complet.