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Problem

I switched from Nvidia Quadro k620 to ATI Radeon HD 7850, and the ATI works nicely, except for random freezes. From syslog:

Feb 21 16:42:34 kvmhost kernel: [14207.534328] DMAR: DRHD: handling fault status reg 2
Feb 21 16:42:34 kvmhost kernel: [14207.534339] DMAR: INTR-REMAP: Request device [[00:00.1] fault index 4
Feb 21 16:42:34 kvmhost kernel: [14207.534339] INTR-REMAP:[fault reason 38] Blocked an interrupt request due to source-id verification failure
Feb 21 16:42:34 kvmhost kernel: [14207.534345] DMAR: INTR-REMAP: Request device [[00:00.0] fault index 2
Feb 21 16:42:34 kvmhost kernel: [14207.534345] INTR-REMAP:[fault reason 38] Blocked an interrupt request due to source-id verification failure
Feb 21 16:42:52 kvmhost kernel: [14225.947331] DMAR: DRHD: handling fault status reg 202
Feb 21 16:42:52 kvmhost kernel: [14225.947343] DMAR: INTR-REMAP: Request device [[00:00.1] fault index 4
Feb 21 16:42:52 kvmhost kernel: [14225.947343] INTR-REMAP:[fault reason 38] Blocked an interrupt request due to source-id verification failure

Attempted fix

I searched Google for DMAR, and a page about Intel-IOMMU on kernel.org said to disable "igfx" by using intel_iommu=igfx_off. The symptoms are still there, though.

I followed the Intel-IOMMU page and tried to report a bug, but they replied and said to ask here.

System information

  • Install Version: Ubuntu 16.04.2
  • uname -a: Linux kvmhost 4.4.0-64-generic #85-Ubuntu SMP Mon Feb 20 11:50:30 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

If you need more information then please let me know. Thanks for your effort.

3
  • Define freeze! Can you change to VT? Log in with SSH? Which video driver? What is xorg.conf?
    – pauljohn32
    Feb 23, 2017 at 10:37
  • evernote.com/l/AIl-Zu7VFUNN7aqLzTU5EJUh19Lq0hxp9bk Could check above link? I answered your question. Thanks for your effort.. Feb 24, 2017 at 7:07
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    I think it is solved. pci=nomsi, I added it to grub. sudo vi /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="pci=nomsi" After that, the freeze disappear. Thanks for your effort. Feb 24, 2017 at 9:47

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