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

[bugzilla-daemon at freedesktop.org]

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

Giovanni Grieco <giovanni.grc96 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |giovanni.grc96 at gmail.com

--- Comment #80 from Giovanni Grieco <giovanni.grc96 at gmail.com> ---
Created attachment 138682
  --> https://bugs.freedesktop.org/attachment.cgi?id=138682&action=edit
crash dump of Intel Iris Graphics 6100

Description of problem:
GPU HANG when launch systemctl start graphical.target with kernel flag
"intel_iommu=on" 

Version-Release number of selected component (if applicable):
xorg-x11-drv-intel-2.99.917-31.20171025.fc27.x86_64
gnome-shell-3.26.2-4.fc27.x86_64
kernel-4.15.14-300.fc27.x86_64

How reproducible:
100%

Steps to Reproduce:
1. Boot with kernel option 'intel_iommu=on'. 
2. GPU will hang at the start of GDM login screen.

Actual results:
dmesg:
[  354.039739] [drm] GPU HANG: ecode 8:-1:0x00000000, reason: Kicking stuck
wait on rcs0, action: continue
[  354.039740] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[  354.039740] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[  354.039741] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[  354.039741] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[  354.039742] [drm] GPU crash dump saved to /sys/class/drm/card0/error

Expected results:
GPU not hang

Additional info:
Hardware: Apple MacBook Pro Early 2015 13-inch
GPU: Intel Iris Graphics 6100
Distro: Fedora Workstation 27 x86_64

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