Comment 55 for bug 1160188

As indicated in bug #971809, the fix is now part of Linux 3.11 and can be obtained via backports:

Get the latest package: https://www.kernel.org/pub/linux/kernel/projects/backports/2013/06/18/
Unpack.
make defconfig-ath9k && make && sudo make install
Reboot & enjoy. (until next kernel package update)