Bug 842444

Description of problem:

For the last few 3.4 kernel versions, I've had trouble with resuming from suspend. Resuming seemed to work completely successfully, however approximately 30 seconds after resuming, my system would cold reboot. This did not happen if I hibinated the machine instead.

I'm aware my system has Intel Active Management Technology (AMT), that it has a hardware watchdog, and that the staging mei module is a driver for it. I guessed that the watchdog may have been firing, as there was no evidence of a hardware fault. I installed the staging kernel modules so that the mei module was available. After installing the mei module, my system now successfully resumes from suspend.

It would seem that in recent kernels, resuming without the mei module installed is not putting the AMT hardware back into the same state that the system boot does, and that causes the watchdog timer to go off.

Version-Release number of selected component (if applicable):

Various 3.4 kernels, including current 3.4.6-2.

How reproducible:

Every time I suspend the machine.

Steps to Reproduce:
1. Suspend the machine
2. Resume
3. Wait approximately 30 seconds, and then observe the machine cold reboot
  
Actual results:

System apparently reboots for no reason.

Expected results:

System does not reboot.

Additional info:

Work around is to install the staging modules (via the meta package, so that kernel upgrades drag in the corresponding kernel staging module). The mei module is loaded automatically at boot.