Re: i915-related and general system freezes with specific kernelconfig // IOMMU
From: Mihai Moldovan
Date: Sun Jan 20 2013 - 16:52:43 EST
Hi Daniel,
the patch does work, i.e., it turns off DMAR for the graphics card and
alleviates the freezes when loading i915/kms.
However, still seeing random machine freezes with it (being consistent with the
behavior I've experienced with intel_iommu=igfx_off).
The patch + forcing RWBF is working, too. Interestingly, this version didn't
randomly freeze yet, after more than 5 hours of uptime! I'll leave the box
running until tomorrow to make sure I did stick around long enough.
All those tested kernels were able to handle USB and PCI(e) devices.
I still have to test turning off IOMMU in general and Intel IOMMU specifically.
Will probably do this tomorrow.
Thank you so far! :)
Mihai
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