As said there: https://lkml.org/lkml/2021/5/13/752
The bug was also reproduced on Intel Kentsfield platform (Core 2 Quad Q6600 (with VIA PT880/VT82xx) with R300 and TeraScale GPUs. ** Summary changed: - AGP GPUs driven as PCI ones (when AGP is disabled at kernel build time) are 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 AMD K8, K10 and Intel Kentsfield platforms -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 AMD K8, K10 and Intel Kentsfield 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1902981/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
