Public bug reported:
[Impact]
AMD Radeon Pro W5700 doesn't work at all, driver failed to probe the
device due to IOMMU error.
[Fix]
Disable PCI ATS for the device.
[Test]
After applying the patch, there's no more IOMMU error, and the driver
can correctly probe the device. The grahpics also works great.
[Regression Potential]
Low. amdgpu is known to work well with ATS disabled. In addition to
that, AMD confirmed it's the correct fix for this card, so the chance to
break anything is rather low.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux-oem-5.6 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Focal)
Importance: Critical
Status: Confirmed
** Affects: linux-oem-5.6 (Ubuntu Focal)
Importance: Critical
Status: Confirmed
** Tags: oem-priority originate-from-1887609 sutton
** Also affects: linux-oem-5.6 (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.6 (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux-oem-5.6 (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux (Ubuntu Focal)
Importance: Undecided => Critical
** Changed in: linux-oem-5.6 (Ubuntu Focal)
Importance: Undecided => Critical
** Changed in: linux (Ubuntu)
Status: New => Invalid
** Changed in: linux-oem-5.6 (Ubuntu)
Status: New => Invalid
** Tags added: oem-priority originate-from-1887609 sutton
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https://bugs.launchpad.net/bugs/1890306
Title:
Fix IOMMU error on AMD Radeon Pro W5700
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