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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #54 from Ernest Hurtado <mqajjhfn at 10mail.org> ---
Created attachment 130657
  --> https://bugs.freedesktop.org/attachment.cgi?id=130657&action=edit
/sys/class/drm/card0/error Intel HD Graphics 5500

Hi! I got bite by this bug recently after enabling IOMMU by intel_iommu=on
kernel command line. It happen to me once (for now), soon after resume from
suspend my GPU hanged.

I saw someone recommended disabling EFI framebuffe - how do you exactly do
this? Here excerpt from my dmesg:

dmesg | grep VGA
fb0: EFI VGA frame buffer device
fb: switching to inteldrmfb from EFI VGA
[drm] Replacing VGA console driver


DMESG log during hang:

DMAR: DRHD: handling fault status reg 3
DMAR: [DMA Read] Request device [00:02.0] fault addr faf16000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 2
DMAR: [DMA Read] Request device [00:02.0] fault addr faf53000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 2
DMAR: [DMA Read] Request device [00:02.0] fault addr faf4f000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 3
DMAR: [DMA Read] Request device [00:02.0] fault addr faf56000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 2
DMAR: [DMA Read] Request device [00:02.0] fault addr faf60000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 2
DMAR: [DMA Read] Request device [00:02.0] fault addr faf5b000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 2
DMAR: [DMA Read] Request device [00:02.0] fault addr faf18000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 2
DMAR: [DMA Read] Request device [00:02.0] fault addr faf1a000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 2
DMAR: [DMA Read] Request device [00:02.0] fault addr faf1c000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 2
DMAR: [DMA Read] Request device [00:02.0] fault addr faf2b000 [fault reason 05]
PTE Write access is not set
[drm] GPU HANG: ecode 8:0:0x85dffffb, in Xorg [533], reason: Hang on render
ring, action: reset
[drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including
userspace.
[drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI ->
DRM/Intel
[drm] drm/i915 developers can then reassign to the right component if it's not
a kernel issue.
[drm] The gpu crash dump is required to analyze gpu hangs, so please always
attach it.
[drm] GPU crash dump saved to /sys/class/drm/card0/error
drm/i915: Resetting chip after gpu hang
dmar_fault: 235 callbacks suppressed
DMAR: DRHD: handling fault status reg 3
DMAR: [DMA Read] Request device [00:02.0] fault addr ff267000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 3
DMAR: [DMA Read] Request device [00:02.0] fault addr ff283000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 3
DMAR: [DMA Read] Request device [00:02.0] fault addr ff251000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 3
DMAR: [DMA Read] Request device [00:02.0] fault addr ff291000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 3
DMAR: [DMA Read] Request device [00:02.0] fault addr ff2af000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 3
DMAR: [DMA Read] Request device [00:02.0] fault addr ff2bf000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 3
DMAR: [DMA Read] Request device [00:02.0] fault addr ff2f0000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 3
DMAR: [DMA Read] Request device [00:02.0] fault addr ff2bc000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 3
DMAR: [DMA Read] Request device [00:02.0] fault addr ff2dc000 [fault reason 05]
PTE Write access is not set
DMAR: DRHD: handling fault status reg 3
DMAR: [DMA Read] Request device [00:02.0] fault addr ff2ed000 [fault reason 05]
PTE Write access is not set
drm/i915: Resetting chip after gpu hang
[drm] Reducing the compressed framebuffer size. This may lead to less power
savings than a non-reduced-size. Try to increase stolen memory size if
available in BIOS.

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