Bug#935270: linux: igfx iommu causes hangs: DMAR: DRHD: handling fault status reg 3

From	Paul Menzel <pmenzel@molgen.mpg.de>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#935270: linux: igfx iommu causes hangs: DMAR: DRHD: handling fault status reg 3
Date	2019-08-21 12:10 +0200
Message-ID	<yxvJ0-76w-13@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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package: src:linux
version: 5.2.9-1
Forwarded: https://bugs.freedesktop.org/show_bug.cgi?id=111451

Dear Debian folks,


Selecting INTEL_IOMMU_DEFAULT_ON [1] causes problem on my Dell Latitude 
E7250.

     00:00.0 Host bridge [0600]: Intel Corporation Broadwell-U Host 
Bridge -OPI [8086:1604] (rev 09)
     00:02.0 VGA compatible controller [0300]: Intel Corporation HD 
Graphics 5500 [8086:1616] (rev 09)

Using `intel_iommu=igfx_off` works around the issue [2].

There are many reports on the Web about the same issues when this option 
is selected. I created a separate issue in the freedesktop.org bug 
tracker [3] with all logs attached.

Until upstream fixes this, I suggest to not select that configuration 
option.


Kind regards,

Paul


[1]: https://bugs.debian.org/934309
[2]: https://bugs.kali.org/view.php?id=5644
[3]: https://bugs.freedesktop.org/show_bug.cgi?id=111451

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Bug#935270: linux: igfx iommu causes hangs: DMAR: DRHD: handling fault status reg 3 Paul Menzel <pmenzel@molgen.mpg.de> - 2019-08-21 12:10 +0200
  Bug#935270: Acknowledgement (linux: igfx iommu causes hangs: DMAR: DRHD: handling fault status reg 3) "Paul Menzel" <pmenzel@molgen.mpg.de> - 2019-08-21 12:20 +0200
  Bug#935270: marked as done (linux: igfx iommu causes hangs: DMAR:  DRHD: handling fault status reg 3) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2019-08-21 15:20 +0200

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