[Bug 100076] New: [BDW] intel_iommu=on GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100076

            Bug ID: 100076
           Summary: [BDW] intel_iommu=on GPU hang
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: pothos at riseup.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 130083
  --> https://bugs.freedesktop.org/attachment.cgi?id=130083&action=edit
/sys/class/drm/card0/error (gz)

When activating intel_iommu=on GPU hangs can happen (here in GNOME Shell
Wayland shortly after wakeup from suspend).
With intel_iommu=on,igfx_off it seems to be fine.

CPU: Intel Core i3-5010U CPU @ 2.1GHz
GPU: Mesa DRI Intel(R) HD Graphics 5500 (Broadwell GT2)
Linux 4.9.0-2-amd64 #1 SMP Debian 4.9.13-1 (2017-02-27) x86_64 GNU/Linux
dmesg:
[  470.659847] DMAR: DRHD: handling fault status reg 3
[  470.659854] DMAR: [DMA Write] Request device [00:02.0] fault addr fb149000
[fault reason 23] Unknown
[  480.871397] [drm] GPU HANG: ecode 8:0:0x85dffffb, in gnome-shell [2879],
reason: Hang on render ring, action: reset
[  480.871398] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[  480.871399] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[  480.871399] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[  480.871400] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[  480.871400] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[  480.876006] drm/i915: Resetting chip after gpu hang
[  492.838851] drm/i915: Resetting chip after gpu hang
[  502.823063] drm/i915: Resetting chip after gpu hang

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