[Bug 100203] New: i915: GPU hang with intel_iommu=on

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100203

            Bug ID: 100203
           Summary: i915: GPU hang with intel_iommu=on
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: stsp at list.ru
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 130221
  --> https://bugs.freedesktop.org/attachment.cgi?id=130221&action=edit
dmesg

With intel_iommu=on in command line, GPU hangs at
boot, after which, the entire machine freeze happens.
I managed to retrieve logs by using "linux=single" -
it helps to avoid the full machine freeze sometimes
(maybe because X doesn't start then), but its still
a blank screen.

intel_iommu=on,igfx_off fixes the problem but I guess
this will not allow to pass-through the video card,
is this correct?

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