On a side note, because we see a clear behaviour difference when
applying the PCI patch we can assume the driver catch the `rdev->flags &
RADEON_IS_PCI` test instead of the `rdev->flags & RADEON_IS_AGP` one
when running an AGP GPU with AGP disabled in kernel at build time.
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Tags added: amd64 focal kernel-bug
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https://bugs.launchpad.net/bugs/1902981
Title:
AGP GPU on PCI mode (when AGP is disabled at kernel build time) known
to fail on K8 and K10 platforms
Status in linux package in Ubuntu:
Confirmed
Bug description:
This bug is to track specific issues faced by AGP GPUs when running as
PCI devices (when AGP support is disabled at kernel build time),
unless otherwise proven it is believed fixing #1902795 (PCI GPUs
support being broken) may not fix all issues for AGP GPUs running as
PCI ones (more to come on that topic).
See related bugs:
- https://bugs.launchpad.net/bugs/1902795
> PCI graphics broken on AMD K8/K10 platform (while it works on Intel)
verified from Linux 4.4 to 5.10-rc1
- https://bugs.launchpad.net/bugs/1899304
> AGP disablement leaves GPUs without working alternative (PCI fallback is
broken), makes very-capable ATI TeraScale GPUs unusable
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