https://bugs.freedesktop.org/show_bug.cgi?id=29433
--- Comment #3 from Mjules mjulien.m@gmail.com 2010-08-09 09:22:12 PDT --- Hi, thanks for taking care :)
desktop is not frozen nor locked when it happens. It's just that when I move the cursor, sometimes it « jumps » to about 1cm forward on the screen (for an analogy it's the same sensation when a video drop frame).
I'll attach dmesg and Xorg.log but I didn't manage to spot anything in there.