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Yup, as we discovered this seemed to happen sometime in the 3.6 cycle, and affects the system after a suspend/resume. After a cold boot the problem disappears. Apparently there's a fix coming in kernel 3.8 but that's a ways off. In the meantime, you may be able to work around this problem at least sometimes by adding this to your kernel's boot line in /boot/grub2/grub.cfg (the line that starts with vmlinuz):


I've found this takes care of the problem about 2 out of 3 times when I resume. If the problem comes back, which I verify using powertop and looking at the "Idle Stats," I just suspend and resume again until it disappears. It usually only takes one additional suspend/resume for that to happen.