Public bug reported:
[Impact]
Integrated GPU on AMD based HP desktop doesn't work.
[Fix]
Coalesce host bridge contiguous apertures so the resources requested by
child devices can be met.
[Test]
Boot affected systems. No picture from the iGPU.
With the patch applied, iGPU can work normally.
[Where problems could occur]
Assume there are device A and device B and they request overlapped
resource region, the original logic may not be able to allocate enough
resource for A so device B claimed the resource in the end.
Once the fix is applied, the region may be big enough for device A,
hence device B won't be able to get the resource it needs.
Hopefully we don't have such broken systems.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Critical
Status: Confirmed
** Affects: linux-oem-5.10 (Ubuntu)
Importance: Undecided
Status: Invalid
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: Won't Fix
** Affects: linux-oem-5.10 (Ubuntu Focal)
Importance: Critical
Status: Confirmed
** Affects: linux (Ubuntu Hirsute)
Importance: Critical
Status: Confirmed
** Affects: linux-oem-5.10 (Ubuntu Hirsute)
Importance: Undecided
Status: Invalid
** Tags: oem-priority originate-from-1914373 stella
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: linux-oem-5.10 (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-oem-5.10 (Ubuntu)
Status: New => Invalid
** Changed in: linux-oem-5.10 (Ubuntu Focal)
Status: New => Confirmed
** Changed in: linux-oem-5.10 (Ubuntu Hirsute)
Status: New => Invalid
** Changed in: linux (Ubuntu Focal)
Status: New => Won't Fix
** Changed in: linux (Ubuntu)
Status: New => Confirmed
** Changed in: linux (Ubuntu Hirsute)
Status: New => Confirmed
** Changed in: linux (Ubuntu)
Importance: Undecided => Critical
** Changed in: linux (Ubuntu Hirsute)
Importance: Undecided => Critical
** Changed in: linux-oem-5.10 (Ubuntu Focal)
Importance: Undecided => Critical
** Tags added: oem-priority originate-from-1914373 stella
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https://bugs.launchpad.net/bugs/1931147
Title:
Fix non-working GPU on Some HP desktops
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