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[Bug 901386] Re: Ubuntu 3.2 kernels vs. nvidia-current vs GTX 560 (Mainline works)

 

I found the blank screen is actually caused busy xorg process. And there
are huge number of error like below in kern.log.  Add intel_iommu=off to
kernel boot option and now it works perfectly.

Dec 24 13:28:54 ainur kernel: [  420.863224] DMAR:[DMA Read] Request device [01:00.0] fault addr 122886000
Dec 24 13:28:54 ainur kernel: [  420.863225] DMAR:[fault reason 01] Present bit in root entry is clear
Dec 24 13:28:54 ainur kernel: [  420.866458] DRHD: handling fault status reg 2

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https://bugs.launchpad.net/bugs/901386

Title:
  Ubuntu 3.2 kernels vs. nvidia-current vs GTX 560 (Mainline works)

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