Public bug reported:

[Impact]
After suspend then restart, the System would hang during shutdown.

[Fix]
Skip the TE disabling for the quirky gfx dedicated iommu and
the system would not hang during shutdown.

[test]
With the patch, the machine restart successfully.

[Regression Potential]
low, the patch just skip the TE disabling and wouldn't affect the normal usage.

** Affects: linux-oem-5.6 (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: linux-oem-5.6 (Ubuntu Focal)
     Importance: Undecided
     Assignee: koba (kobako)
         Status: In Progress

** Also affects: linux-oem-5.6 (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Changed in: linux-oem-5.6 (Ubuntu Focal)
     Assignee: (unassigned) => koba (kobako)

** Changed in: linux-oem-5.6 (Ubuntu Focal)
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1888375

Title:
  Restart the machine successfully after suspend

Status in linux-oem-5.6 package in Ubuntu:
  New
Status in linux-oem-5.6 source package in Focal:
  In Progress

Bug description:
  [Impact]
  After suspend then restart, the System would hang during shutdown.

  [Fix]
  Skip the TE disabling for the quirky gfx dedicated iommu and
  the system would not hang during shutdown.

  [test]
  With the patch, the machine restart successfully.

  [Regression Potential]
  low, the patch just skip the TE disabling and wouldn't affect the normal 
usage.

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