https://bugs.freedesktop.org/show_bug.cgi?id=30616
--- Comment #1 from Andy Furniss lists@andyfurniss.entadsl.com 2010-10-12 03:14:10 PDT --- (In reply to comment #0)
I get quite severe 1/2 second glitches running the mesa demo tunnel
Still getting this, just wanted to add that it seems to be related to demos that start with help text. Tunnel, teapot and terrain will all glitch really badly when I start then with my card set to high. Pressing h to remove the text will alleviate the problem, though I will still get another glitch after some time (say 30 secs).