Comment 62 for bug 583760

The same is also happening for me with Fedora 13 Alpha (fully updated).

Hardware:
01:00.0 VGA compatible controller: nVidia Corporation Quadro NVS 290 (rev a1)
Intel(R) Core(TM)2 Quad CPU Q9400
HP dc7900 (IC10 chipset)

Software:
kernel-2.6.33-1.fc13.x86_64 with no non-Fedora modules
xorg-x11-drv-nouveau-0.0.16-2.20100218git2964702.fc13.x86_64

I have been running Fedora 13 Alpha since the release day, and the problem only happened today after about 4 hours uptime and 2 hours of active work. Something is different today than the days before: I've mounted the debugfs at /sys/kernel/debug, which I have not done before today. It would be a strange connection if this was the culprit, though.