External display flickers when switching window focus on main display

[neilking01]

Hyprland Version

v0.40.0

Bug or Regression?

Bug

Description

External screen flickers sometimes when switching window focus.

Please see video: https://youtu.be/FTt0BPJ43Cg

How to reproduce

Its intermittent. Not sure what triggers it. Am using Arch on a Dell XPS 13 Plus.

Crash reports, logs, images, videos

No response

[vaxerski]

what if you open a window on the display?

[neilking01]

I've seen it happening with windows on the display too. It's intermittent, so hard to reproduce. I'm sticking to v0.38.1 for now but can tempararily test v0.40.0 if there are more things you want me to try that will help in fixing the bug.

[vaxerski]

does that mean it's a regression? You haven't marked it as such.

[neilking01]

I'm not sure if this specific bug has been reported before by someone else. If you're referring to a similar bug that I reported, this one is slightly different in that a large portion of the screen flickers rather than a specific window that overlaps displays.

[ajmasia]

The same here on external monitor using HDMI with AMD Ryzen winth NixOS Unstable

Hyprland 0.41.1

https://github.com/hyprwm/Hyprland/assets/23419327/7e56f804-12f4-4d52-bdd5-0e0422e314cb

I've noted that it;s more frequent using Firefox

Hyprland module

{ inputs, pkgs, ... }:
# let
#   openglPackage = pkgs.mesa.drivers;
#   openglPackage32 = pkgs.pkgsi686Linux.mesa.drivers;
# in
{

  programs.hyprland = {
    enable = true;

    package = inputs.hyprland.packages.${pkgs.system}.hyprland;
    xwayland.enable = true;

    portalPackage = inputs.hyprland.packages.${pkgs.system}.xdg-desktop-portal-hyprland.override
      {
        inherit (pkgs) mesa;
      };

    # https://github.com/hyprwm/Hyprland/issues/5148
    # portalPackage = inputs.hyprland.packages.${pkgs.system}.xdg-desktop-portal-hyprland.override {
    #   inherit (pkgs) mesa;
    # };
  };

  programs.dconf.enable = true;

  environment.sessionVariables = {
    NIXOS_OZONE_WL = "1"; # hint electron apps to use wayland
    MOZ_ENABLE_WAYLAND = "1"; # ensure enable wayland for Firefox
    WLR_RENDERER_ALLOW_SOFTWARE = "1"; # enable software rendering for wlroots
    WLR_NO_HARDWARE_CURSORS = "1"; # disable hardware cursors for wlroots
    NIXOS_XDG_OPEN_USE_PORTAL = "1"; # needed to open apps after web login
  };

  services = {
    # Applications messaging system
    dbus = {
      enable = true;

      packages = with pkgs; [
        gcr # crypto services (from gnome)
        dconf # settings daemon (from gnome)
      ];
    };
  };

  xdg = {
    portal = {
      enable = true;

      extraPortals = with pkgs; [
        xdg-desktop-portal-gtk
      ];
      configPackages = [
        pkgs.xdg-desktop-portal-gtk
      ];
    };
  };

  hardware = {
    opengl =
      {
        enable = true;

        # package = openglPackage;
        # package32 = openglPackage32;

        driSupport = true;
        driSupport32Bit = true;
      };
  };
}