xrandrHeads doesnt seem to work (maybe nvidia related)

[gallexme]

Describe the bug xrandrheads settings are beeing ignored by xserver

To Reproduce on a nvidia system(not sure if others are affected)

services.xserver.xrandrHeads = [ 
    {
      output = "DP-2";
      primary = true;
    }
    {
      output="DP-4"; 
      monitorConfig =
    ''
            Option "LeftOf" "DP-2"
    '';
    }
  ];

Expected behavior dp-2 should be primary and dp-4 should be left of dp-2

Additional context generated x config

Section "Files"

  FontPath "/nix/store/jlqzanp3y82apzj2hlx04vhvfb2ka85y-font-bh-lucidatypewriter-100dpi-1.0.3/lib/X11/fonts/100dpi"
  FontPath "/nix/store/g5g7vc7pnpd5f009cmaggw4miv6xa40p-font-bh-lucidatypewriter-75dpi-1.0.3/lib/X11/fonts/75dpi"
  FontPath "/nix/store/mirimzji3bx5d6vnb1swc3idskpjppy3-font-bh-100dpi-1.0.3/lib/X11/fonts/100dpi"
  FontPath "/nix/store/l4jj0r83pp1393z5x6wbh1w6cf64s6zi-font-misc-misc-1.1.2/lib/X11/fonts/misc"
  FontPath "/nix/store/3ph76wlhgk2s0jj5h04qz40j77xqfddp-font-cursor-misc-1.0.3/lib/X11/fonts/misc"
  FontPath "/nix/store/nyx1r5a0vnw0s84p8nh1mqcln89rm3rl-unifont-12.1.03/share/fonts"
  FontPath "/nix/store/lw67xrwapl1680nv9wj2ysj8fx2mkf09-font-adobe-100dpi-1.0.3/lib/X11/fonts/100dpi"
  FontPath "/nix/store/7zg55myfgbm5c2ibbf8ah5jgpj27zvbk-font-adobe-75dpi-1.0.3/lib/X11/fonts/75dpi"
  ModulePath "/nix/store/n83jcxg0ywvwf6mvjcnl8vzh524qlsdk-nvidia-x11-435.21-4.19.80-bin/lib/xorg/modules/extensions"
  ModulePath "/nix/store/n83jcxg0ywvwf6mvjcnl8vzh524qlsdk-nvidia-x11-435.21-4.19.80-bin/lib/xorg/modules/drivers"
  ModulePath "/nix/store/lqmp6hz15a4ahc419fl23f6y6als06ln-xorg-server-1.20.5/lib/xorg/modules"
  ModulePath "/nix/store/lqmp6hz15a4ahc419fl23f6y6als06ln-xorg-server-1.20.5/lib/xorg/modules/extensions"
  ModulePath "/nix/store/lqmp6hz15a4ahc419fl23f6y6als06ln-xorg-server-1.20.5/lib/xorg/modules/drivers"
  ModulePath "/nix/store/wsg47c85z3n59k7lf7ndggz2fv28kiar-xf86-input-evdev-2.10.6/lib/xorg/modules/input"
  ModulePath "/nix/store/9xwxymrmp612m8j2j9n99sj950d6nrpj-xf86-input-libinput-0.28.2/lib/xorg/modules/input"
EndSection
 Section "InputClass"
      Identifier "joystick catchall"
        MatchIsJoystick "on"
          MatchDevicePath "/dev/input/event*"
          # MatchDevicePath "/dev/input/js*"
        #Driver "joystick"
    Driver "evdev"
        Option "StartKeysEnabled" "False"
        Option "StartMouseEnabled" "False"
      # Option "MapAxis1" "deadzone=4000"
      # Option "MapAxis2" "deadzone=4000"
 EndSection

Section "ServerFlags"
  Option "AllowMouseOpenFail" "on"
  Option "DontZap" "on"

EndSection

Section "Module"

EndSection

Section "Monitor"
  Identifier "Monitor[0]"

EndSection

# Additional "InputClass" sections

Section "ServerLayout"
  Identifier "Layout[all]"

  # Reference the Screen sections for each driver.  This will
  # cause the X server to try each in turn.
  Screen "Screen-nvidia[0]"

EndSection

# For each supported driver, add a "Device" and "Screen"
# section.

Section "Device"
  Identifier "Device-nvidia[0]"
  Driver "nvidia"

  Option "monitor-DP-4" "multihead1"
  Option "monitor-DP-2" "multihead2"

EndSection

Section "Screen"
  Identifier "Screen-nvidia[0]"
  Device "Device-nvidia[0]"

  Option "RandRRotation" "on"

EndSection

Section "Monitor"
  Identifier "multihead1"

                Option "LeftOf" "DP-2"

EndSection
Section "Monitor"
  Identifier "multihead2"
  Option "Primary" "true"

  Option "RightOf" "multihead1"

EndSection

# Automatically enable the libinput driver for all touchpads.
Section "InputClass"
  Identifier "libinputConfiguration"
  MatchIsTouchpad "on"

  Driver "libinput"
  Option "AccelProfile" "adaptive"

  Option "LeftHanded" "off"
  Option "MiddleEmulation" "on"
  Option "NaturalScrolling" "off"

  Option "ScrollMethod" "twofinger"
  Option "HorizontalScrolling" "on"
  Option "SendEventsMode" "enabled"
  Option "Tapping" "on"
  Option "TappingDragLock" "on"
  Option "DisableWhileTyping" "off"

EndSection

Metadata Please run nix run nixpkgs.nix-info -c nix-info -m and paste the result. nix run nixpkgs.nix-info -c nix-info -m nix: src/libexpr/attr-set.hh:54: void nix::Bindings::pushback(const nix::Attr&): Assertion `size < capacity_' failed. Aborted (core dumped) uhm?? lets just say newest unstable had same issue since 18.03 but ive used gnome/kde in past to set displays there now im using awesomewm/i3 which dont provide such functionality

Maintainer information:

# a list of nixpkgs attributes affected by the problem
attribute:  services.xserver.xrandrHeads
# a list of nixos modules affected by the problem
module: services.xserver

[stale[bot]]

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[GGG-KILLER]

Still an issue in unstable.

[zeorin]

I'm working around this as follows for the time being:

{
  displayManager.setupCommands = "${pkgs.xorg.xrandr}/bin/xrandr --output HDMI-0 --auto --output DP-1 --auto --right-of HDMI-0 --primary";
}

From https://github.com/NixOS/nixpkgs/issues/30796#issuecomment-675866888, which might be the same underlying issue.

[JordanPavlic]

still an issue in unstable - lost 4 hours on this bug before finding this.