Thanks for the update.

That's a bit of good news that the v4 kernel is bad, since the v2 kernel
was good.  I enabled the following config parameters in the v4 kernel:

CONFIG_IRQ_REMAP=y 
 CONFIG_INTEGRITY=y                              
CONFIG_INTEL_IOMMU=y                            
CONFIG_INTEL_IOMMU_DEFAULT_ON=y                 
CONFIG_INTEL_IOMMU_FLOPPY_WA=y                  

I'll build a test kernel with the IOMMU options disabled like they are
in 3.1.0-2.3.

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https://bugs.launchpad.net/bugs/914161

Title:
  Linux 3.2 freezes system on FUJITSU ESPRIMO P7935

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