The upcoming stable update for Debian (7.2) should have a new Linux kernel version, fixing various bugs. I have uploaded version 3.2.51-1 which is now available in wheezy-proposed-updates.
I would appreciate any regression testing people can do before this is released. Also, this fixes one of the causes of lock-ups currently seen with newer Intel GPUs, though we don't know exactly which bug reports were due to this. If you've reported this kind of problem, please test whether this version fixes it.
Updated 2013-09-23: KiBi reminded me to link to the page about proposed-updates. And the update is now available for all architectures.