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.