Some displays not recognized anymore after update

[Noratrieb]

Describe the bug

Only one of my three displays is recognized and displays anything. xrandr only showed that one display. The non-working displays were connected with display port, the working one was HDMI.

This happened after updating (I am on unstable): https://github.com/Nilstrieb/nixos/commit/3039fb6454aeae6730d5d1fabc895cc25dbb1fdd

I will attempt to bisect the regression.

Steps To Reproduce

Steps to reproduce the behavior: I don't really have concise steps to reproduce, it happened when upgrading from 20f77aa09916374aa3141cbc605c955626762c9a to 2726f127c15a4cc9810843b96cad73c7eb39e443. I use X11 with GNOME.

Expected behavior

All 3 displays are working.

Screenshots

If applicable, add screenshots to help explain your problem.

Additional context

Add any other context about the problem here.

Notify maintainers

Metadata

Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

[user@system:~]$ nix-shell -p nix-info --run "nix-info -m"
# This is the working version, as I can't properly show the non-working one.
 - system: `"x86_64-linux"`
 - host os: `Linux 6.6.22, NixOS, 24.05 (Uakari), 24.05.20240321.20f77aa`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.18.2`
 - channels(root): `"nixos"`
 - channels(nils): `"nixos"`
 - nixpkgs: `/nix/store/wa8lhchql76i6czzvad3bqz6lvnjnbr5-source`

---

Add a :+1: reaction to issues you find important.

[Noratrieb]

I think the regression was in 1ed5df1e703135d2d6814a761ce67e6e8073af30, I will try to verify that.

[Noratrieb]

Yes, it was that commit. @K900 do you have an idea what could be causing this problem? I know nothing about graphics, so I'm happy to fix my config of there was a problem somewhere.

[K900]

What hardware is this on?

[Noratrieb]

CPU: AMD Ryzen 9 3950X, GPU: NVIDIA GeForce RTX 2080 Ti

[K900]

Are you running the proprietary Nvidia driver or Nouveau?

[Noratrieb]

I think I am using the proprietary driver: https://github.com/Nilstrieb/nixos/blob/03be64e31a82968c42f2de5fae6787e971ca798c/nixos/configuration.nix#L127

[K900]

Can you try setting hardware.nvidia.modesetting.enable = true;?

[Noratrieb]

I added that option and updated to the broken commit and to the latest nixos-unstable and it worked again, thanks.

[shimunn]

Same propblem here on an ThinkPad T470s via Intel HD Graphics

[librephoenix]

I'm having this same issue on an Asus Rog Strix G15. I'm using Hyprland.

CPU: AMD Ryzen 9 5900HX GPU: AMD Radeon RX 6800M

Also this if it's helpful:

[emmet@snowfire:~]$ nix-shell -p nix-info --run "nix-info -m"
- system: `"x86_64-linux"`
- host os: `Linux 6.8.0-zen1, NixOS, 24.05 (Uakari), 24.05.20240321.20f77aa`
- multi-user?: `yes`
- sandbox: `yes`
- version: `nix-env (Nix) 2.18.2`
- channels(root): `"nixos-22.11"`
- channels(emmet): `"home-manager, nixpkgs"`
- nixpkgs: `/home/emmet/.nix-defexpr/channels/nixpkgs`

EDIT: My problem might be a separate issue (?) I finaly figured out that before the update, my graphics devices were registered as /dev/dri/card0 and /dev/dri/card1, but after updating, they are now /dev/dri/card1 and /dev/dri/card2. I had hardcoded card0 and card1 into my Hyprland config per some old Hyprland wiki instructions, however now the Hyprland wiki has updated instructions: https://wiki.hyprland.org/Configuring/Multi-GPU/

I haven't tried the graphics device symlinking strategy specified in the Hyprland wiki, but switching from:

env = WLR_DRM_DEVICES,/dev/dri/card0:/dev/dri/card1

to:

env = WLR_DRM_DEVICES,/dev/dri/card2:/dev/dri/card1

was enough to fix it.

I imagine this would fix any similar issues on other wlr-based compositors, but I don't know if there's something similar for Xorg, and/or if this is part of the problem with Xorg systems as well.

Hope this helps anyone else with similar problems :)

[jackschu]

I get an issue where xrandr only picks up a None-1 connected after updating from 23.11 to 24.05 where it used to pick up DP-3 connected primary and so i get terrible resolution.

trying hardware.nvidia.modesetting.enable = true; xrandr does pick up the display seemingly correctly but i get some very weird graphical hiccups (flashing, failing to select, transparency not working)

For now going to stay on 23.11 and see how this shakes out.

---

My info I'm running with a NVIDIA GeForce RTX 2070 SUPER and AMD Ryzen 5 3600X 6-Core Processor with the proprietary drivers

Heres nix-shell -p nix-info --run "nix-info -m"

[jackschu@nixos:~]$ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 6.6.37, NixOS, 24.05 (Uakari), 24.05.2539.49ee0e94463a`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.18.4`
 - channels(root): `"nixos-24.05"`
 - nixpkgs: `/nix/var/nix/profiles/per-user/root/channels/nixos`

[carlthome]

Same issue for me on a 2080 Ti and 5600X.

❯ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 6.6.43, NixOS, 24.05 (Uakari), 24.05.20240730.cf05eea`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.18.5`
 - channels(carl): `""`
 - channels(root): `"nixos, nixpkgs"`
 - nixpkgs: `/nix/store/z3vrsz16ypv60m2pp0gi7x7gpx40gfh1-source`

After hardware.nvidia.modesetting.enable = true; resolution was set for my display but lots of graphical glitches.