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Message #04012
[Bug 2111684] Re: [SRU] Xorg AMD platform A + N config selected wrong primary GPU
The new approach proposed by upstream.
https://gitlab.freedesktop.org/xorg/lib/libpciaccess/-/merge_requests/39
https://lore.kernel.org/linux-pci/20250706143613.1972252-1-superm1@xxxxxxxxxx/T/#m53c998f4946ae7eb99d2cbc329a968a0ed0daba0
Here is the test ppa.
https://launchpad.net/~superm1/+archive/ubuntu/libpciaccess/+packages
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https://bugs.launchpad.net/bugs/2111684
Title:
[SRU] Xorg AMD platform A + N config selected wrong primary GPU
Status in OEM Priority Project:
New
Status in libpciaccess package in Ubuntu:
Fix Released
Status in libpciaccess source package in Noble:
Triaged
Status in libpciaccess source package in Oracular:
Won't Fix
Status in libpciaccess source package in Plucky:
Triaged
Status in libpciaccess source package in Questing:
Fix Released
Bug description:
[ Impact ]
* On AMD platform with Nvidia dGPU, if the iGPU is not VGA compatible. and pci order is later than NV
* The system will select Nvidia as the primary GPU, which is wrong on AMD platform.
[ Test Plan ]
* Test Ubuntu Desktop and kubuntu and Linux Mint impacted by the
package update
* The form factors need to be covered:
I+N Laptop
I+N Desktop with output connect to either I or N
A+N Laptop
A+N Laptop with output connect to either A or N
* Check if the graphical login page can show-up and enter password to
get into the desktop successfully
* After entering desktop Xorg session
* Check the renderer by $ xrandr -display <display name> --listproviders
1. The primary GPU should be on built-in connector for laptop for laptop
2. The primary GPU should be the card with output for Desktop
[ Where problems could occur ]
* The Xorg server can't find device to output
[ Other Info ]
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References