After a recent -current update, using new drmkms on a sandy bridge, I found that e.g., when using firefox, the cpu would hit 100%, all would freeze, and I would have to hard reset, so no actual clue on the problem.
This is on a: i915drmkms0 at pci0 dev 2 function 0: Intel Sandy Bridge Integrated Graphics Device (rev. 0x09) The work around was to pop Option "AccelMethod" "SNA" in /etc/X11/xorg.conf, and things are now stable... Cheers, Patrick
