Display modesetting / repositioning doesn't work with multi-GPU

[CodingKoopa]

Please fill out the following:

• Sway Version: sway version 1.10

• Kernel Version: Currently 6.11.9 rather than 6.12.6 due to an amdgpu bug (but I could test on latest if that'd help)

• Debug Log:

  • Full log: https://gist.github.com/CodingKoopa/b34716a564cf775e36d0c6f620eca31a
    • In this log, I use nwg-displays to attempt to lower eDP-2. It executes two sway commands, starting at Handling command 'output.
  • Separate (shorter) log: https://gist.github.com/CodingKoopa/54a03b7686fe016ad1f326b1d6ebd101
    • In this log, I manually execute the output eDP-2 pos 1920 280 sway command.

• Display/card assignment:

$ ls -l /sys/class/drm
total 0
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card1 -> ../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card1
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card1-DP-1 -> ../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card1/card1-DP-1
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card1-eDP-1 -> ../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card1/card1-eDP-1
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card1-Writeback-1 -> ../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/card1/card1-Writeback-1
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card2 -> ../../devices/pci0000:00/0000:00:08.1/0000:c4:00.0/drm/card2
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card2-DP-2 -> ../../devices/pci0000:00/0000:00:08.1/0000:c4:00.0/drm/card2/card2-DP-2
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card2-DP-3 -> ../../devices/pci0000:00/0000:00:08.1/0000:c4:00.0/drm/card2/card2-DP-3
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card2-DP-4 -> ../../devices/pci0000:00/0000:00:08.1/0000:c4:00.0/drm/card2/card2-DP-4
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card2-DP-5 -> ../../devices/pci0000:00/0000:00:08.1/0000:c4:00.0/drm/card2/card2-DP-5
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card2-DP-6 -> ../../devices/pci0000:00/0000:00:08.1/0000:c4:00.0/drm/card2/card2-DP-6
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card2-DP-7 -> ../../devices/pci0000:00/0000:00:08.1/0000:c4:00.0/drm/card2/card2-DP-7
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card2-DP-8 -> ../../devices/pci0000:00/0000:00:08.1/0000:c4:00.0/drm/card2/card2-DP-8
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card2-DP-9 -> ../../devices/pci0000:00/0000:00:08.1/0000:c4:00.0/drm/card2/card2-DP-9
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card2-eDP-2 -> ../../devices/pci0000:00/0000:00:08.1/0000:c4:00.0/drm/card2/card2-eDP-2
lrwxrwxrwx 1 root root    0 Dec 25 20:33 card2-Writeback-2 -> ../../devices/pci0000:00/0000:00:08.1/0000:c4:00.0/drm/card2/card2-Writeback-2
lrwxrwxrwx 1 root root    0 Dec 25 20:33 renderD128 -> ../../devices/pci0000:00/0000:00:01.1/0000:01:00.0/0000:02:00.0/0000:03:00.0/drm/renderD128
lrwxrwxrwx 1 root root    0 Dec 25 20:33 renderD129 -> ../../devices/pci0000:00/0000:00:08.1/0000:c4:00.0/drm/renderD129
-r--r--r-- 1 root root 4096 Dec 25 20:44 version

• wlr-randr output: (this is after sending a command to adjust eDP2 away from (1920, 0)

$ wlr-randr
DP-3 "Microstep Optix MAG24C 0000000000001 (DP-3 via HDMI)"
  Make: Microstep
  Model: Optix MAG24C
  Serial: 0000000000001
  Physical size: 520x290 mm
  Enabled: yes
  Modes:
    1920x1080 px, 60.000000 Hz (preferred, current)
(SNIP)
    720x400 px, 70.082001 Hz
  Position: 0,0
  Transform: normal
  Scale: 1.000000
  Adaptive Sync: disabled
eDP-2 "BOE 0x0BC9 (eDP-2)"
  Make: BOE
  Model: 0x0BC9
  Serial: (null)
  Physical size: 340x220 mm
  Enabled: yes
  Modes:
    2560x1600 px, 165.000000 Hz (preferred, current)
    2560x1600 px, 60.001999 Hz (preferred)
(SNIP)
    640x480 px, 165.000000 Hz
  Position: 1920,0
  Transform: normal
  Scale: 2.000000
  Adaptive Sync: enabled

• Configuration File:

  • I reset my configuration by moving ~/.config/sway/ to ~/.config/sway.bak and was able to reproduce.

• Description:

This issue started after I installed a dGPU (the Framework 16 Graphics Module) in my Framework 16. The iGPU (AMD Radeon 780M) has been working just fine on its own; however, since installing the dGPU (AMD Radeon RX 7700S), I have not been able to reposition my displays in Sway. The internal display (eDP-2) is apparently connected to a mux s.t. the dGPU is used if present. As for the external display (DP-3), it is connected to an HDMI port that only goes to the iGPU. I don't currently have the necessary USB-C to HDMI cable needed to connect my monitor to the dGPU.

My main test has been moving eDP2 from (1920,0) to (1920,280), but I can't seem to get any repositioning or modesetting to work. I have been trying:

• manually issuing swaymsg "output eDP-2 pos 1920 280", which doesn't error but also doesn't take effect
• wdisplays, which (appears to) revert to the original layout immediately clicking apply
• nwg-displays, which itself keeps the layout change (despite it not taking effect in sway)

Initially I was suspicious that I was getting something like the display name wrong (since they did in fact change), but every time I try using power off / power on, it works without issue.

I have found multiple issues pertaining to multi-display with multi-GPU (including different GPUs for different displays, as in #7460), but in my case, both displays are working; I just can't move them around.

[CodingKoopa]

I just removed the dGPU and noticed that my initial assessment was wrong: all of this still occurs with just my iGPU. The reason why I don't notice is that, even if I revert to the default Sway configuration, from somewhere it gets the layout that I configured at some point (layout changes and setting eDP-1 to use 1.5 fractional scaling - definitely not a Sway default!). I don't understand where It's getting this from, but I've uploaded that log here (can Ctrl-F for 1.5). My feeling at this point is that it's an amdgpu issue.

(That is to say: modesetting/reposition doesn't work with iGPU either, but I don't notice since I've already setup my preferred layout. Perhaps someone more competent can correct the issue title accordingly.)