** Summary changed:

- AGP GPU on PCI mode (when AGP is disabled at kernel build time) known to fail 
on K8 and K10 platforms
+ AGP GPUs driven as PCI ones (when AGP is disabled at kernel build time) are 
known to fail on K8 and K10 platforms

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https://bugs.launchpad.net/bugs/1902981

Title:
  AGP GPUs driven as PCI ones (when AGP is disabled at kernel build
  time) are 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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