Public bug reported:

[Impact]
Connect with the WD19TB on the right TB port and plug the USB dongle on it, 
the machine can't recognize the USB dongle.

[Fix]
Enable the PCI ACS when Intel IOMMU is detected with platform opt in hint.

[test]
With the fix, the machine can recognize the USB dongle.

[Regression Potential]
Low. the patch has landed on the mainline kernel.

** 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

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => koba (kobako)

** Package changed: linux (Ubuntu) => linux-oem-5.6 (Ubuntu)

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

** 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/1891449

Title:
  Enable PCI ACS for platform opt

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