[SRU] [H/Unstable/OEM-5.10] [PATCH 0/1] Fix non-working GPU on Some HP desktops

Kai-Heng Feng kai.heng.feng at canonical.com
Mon Jun 7 16:39:08 UTC 2021

BugLink: https://bugs.launchpad.net/bugs/1931147

Integrated GPU on AMD based HP desktop doesn't work.

Coalesce host bridge contiguous apertures so the resources requested by
child devices can be met.

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.

Kai-Heng Feng (1):
  PCI: Coalesce host bridge contiguous apertures

 drivers/pci/probe.c | 49 +++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 45 insertions(+), 4 deletions(-)


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