Comment 166 for bug 869502

Michael,

The fix for this bug is in the 12.04 kernel as the following commit:

ed66ba472a742cd8df37d7072804b2111cdb1014 rt2x00: Fix sleep-while-atomic bug in powersaving code.

Would it be possible for you to test the latest 12.04, which is available at:
https://launchpad.net/ubuntu/+source/linux/3.2.0-10.17

You can download the .deb for your particular arch by selecting one of the links under the "Builds" section.