[Bug 89360] [bdw-u iommu] DMAR error -> GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89360

--- Comment #66 from Damjan Georgievski <gdamjan at gmail.com> ---
Happens to me too when booting 4.13.3 (also .2).

Hardware is
Thinkpad T450s, latest bios updated
DMI: LENOVO 20BWS10N00/20BWS10N00, BIOS JBET65WW (1.29 ) 06/15/2017
i7-5600U (Broadwell)

Booting 4.13.3-1-ARCH hangs when starting Xorg (sddm), the message I caught via
ssh in the first second before it was hung completely was:
[  123.917760] DMAR: DRHD: handling fault status reg 2
[  123.917765] DMAR: [DMA Write] Request device [00:02.0] fault addr 108a000
[fault reason 23] Unknown


4.12.13-1-ARCH works fine
4.9.51-1-lts works fine too

Distro is Archlinux.
Booting in CLI works fine too.
Booting with "intel_iommu=on,igfx_off" on the kernel command line also works
fine.

$ zgrep IOMMU /proc/config.gz 
CONFIG_GART_IOMMU=y
CONFIG_CALGARY_IOMMU=y
CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT=y
CONFIG_IOMMU_HELPER=y
CONFIG_VFIO_IOMMU_TYPE1=m
# CONFIG_VFIO_NOIOMMU is not set
CONFIG_IOMMU_API=y
CONFIG_IOMMU_SUPPORT=y
# Generic IOMMU Pagetable Support
CONFIG_IOMMU_IOVA=y
CONFIG_AMD_IOMMU=y
CONFIG_AMD_IOMMU_V2=m
CONFIG_INTEL_IOMMU=y
CONFIG_INTEL_IOMMU_SVM=y
CONFIG_INTEL_IOMMU_DEFAULT_ON=y
CONFIG_INTEL_IOMMU_FLOPPY_WA=y
# CONFIG_IOMMU_DEBUG is not set
# CONFIG_IOMMU_STRESS is not set


(ps. by mistake I added this comment to a closed/duplicate bug of this one.
sorry about that)

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