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[DCN32/7900XTX] re-enablement of windowed mpo odm support regresses overlay plane transitions in gamescope-session, introducing artifacts briefly on the primary plane

Brief summary of the problem:

This was discovered while debugging #3441 (closed) but I forgot to split it out into a separate issue after a successful bisect, apologies

When using the side menu to toggle the Mangohud overlay in gamescope-session (gamescope with -e launched from a VT), the overlay transition triggered by the menu toggle briefly introduces corruption into the primary plane.

Bisected to: agd5f/linux@34241dc6

This commit introduces artifacting similar to the type that Vangogh presents in #3441 (closed) except it was a an easy bisect on DCN32 compraed to that specific issue, and the Melissa Wen patch here does not fix the issue: https://lore.kernel.org/amd-gfx/20240822131836.236644-1-mwen@igalia.com/. It remains unclear whether or not the bisected commit causes the same exact issue or a different issue that presents identically, but reverting the bisected commit makes this issue no longer happen on my 7900XTX.

Including several images below with /sys/kernel/debug/dri/0/amdgpu_dm_visual_confirm used to provide additional context.

Hardware description:

  • CPU: AMD Ryzen Threadripper 7970X
  • GPU: [AMD/ATI] Navi 31 [Radeon RX 7900 XT/7900 XTX/7900M] [1002:744c] (rev c8)
  • System Memory: 62.29 GiB @ 6400mhz
  • Display(s): Alienware AW3423DW OLED Monitor, 3440x1440p@175hz maximum with HDR
  • Type of Display Connection: DisplayPort 1.4

System information:

  • Distro name and Version: CachyOS
  • Kernel version: 6.11.0-rc6
  • Custom kernel: 6.11.0-rc6-1-git-00308-gb31c44928842
  • AMD official driver version: N/A

How to reproduce the issue:

Pre-requisites:

  • as new of a gamescope version as possible, preferably 3.15.0 or greater, and using either gamescope -e -f -h 1440 -w 3440 -r 175 --mangoapp -- steam -steamdeck -steamos3 -steampal -gamepadui or the upstream gamescope-session script from Valve's gamescope package directly for consistency. using a more readily accessible fork like gamescope-session-plus is also an option for non-Arch testing and should not affect the viability of this test.

Repro steps in Hades 2:

  1. launch gamescope-session
  2. enter Hades 2 and wait until the game loads, then acknowledge the early access prompt
  3. toggle the mangohud overlay on and off repeatedly with the side menu once you're in the main menu

Attached files:

Screenshots/video files

Plane transition process on 6.11-rc6 with no reverts:

No overlay - note the position of the right side menu is behind the red line: IMG_2056

Toggling overlay on - very start of transition, note the position of the right side menu is now in front of the red line: vlcsnap-2024-09-06-23h14m17s836

Overlay on - transition is complete, artifacts are gone, right side menu is still in front of the red line: IMG_2057

Plane transition process on 6.11-rc6 with agd5f/linux@34241dc6 reverted:

No overlay - note that the position of the ride side menu starts out in front of the red line: IMG_2052

Toggling overlay on - very start of transition, note the position of the right side menu is still in front of the red line: vlcsnap-2024-09-06-23h20m27s925

Overlay on - note that the position of the ride side menu is still in front of the red line: IMG_2053

Log files (for system lockups / game freezes / crashes)

  • Dmesg log (full log): dmesg.log
  • drm_info can be captured via ssh during any overlay transition stage upon request
Edited by Matthew Schwartz