Comment on attachment 90433 [details]
dmesg output for DRM/radeon

I think I've to withdraw my "me too". I certainly did see this in the past, but
the stack I detailed in comment 2 was wrong: I wasn't add KDE 4.11.3-2 (I
hadn't restarted X). Now, really on 4.11.3-2, I'm unable to reproduce the
tearing. What I've seen might have been an KWin issue then.

Sorry for the noise.