Created attachment 142968 [details]
dmesg output with without iommu_intel set
iommu_intel=on fails with i915 on x201 Thinkpad.
Thread on LKML: https://lore.kernel.org/lkml/20181227114948.ev4b3jte3ubsc5us@dcvr/T/
Created attachment 142969 [details]
dmesg output with iommu_on
Created attachment 142970 [details]
Debian 4.17 config
My apologies for responding on this issue so late.
@Joonas, any suggestion how to proceed with this issue?
> Thread on LKML:
In the attached logs I can not find the same warnings as mentioned in link.
Reporter, do you still see the kernel panics? Can you reproduce the issue with drmtip? (https://cgit.freedesktop.org/drm-tip).
Note that Ironlake igfx + iommu is known to be a bad mix -- the gpu cannot be active while iommu is remapped, it seems doubtful that we are able to do that or if that is the only workaround required.
No response from the user for more than 2 months. Resolving this issue as WORKSFORME.