[Bug 86311] New: HDMI audio requires intel_iommu=igfx_off boot option on Haswell

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=86311

            Bug ID: 86311
           Summary: HDMI audio requires intel_iommu=igfx_off boot option
                    on Haswell
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.10 - 3.17
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: patrakov at gmail.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

This is an intentional duplicate of Bug 60769, because the ALSA-specific part
of that bug got fixed, all that is left is a bad interaction between i915 and
iommu, and that requires a different person to handle. But I can't reassign
bugs.

On all Haswell hardware, if you don't provide the intel_iommu=igfx_off option
(and your distro defaults to intel_iommu=on), then attempts to output audio via
HDMI will lead to undesired behaviour that is different between systems. On
some systems, audio crackles, on others the audio stream immediately hangs.

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