[kwin] [Bug 506650] Regression: HDMI signal lost on EDID change

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=506650

--- Comment #2 from ja...@okonski.org ---
Still happening on 6.4.5, kernel 6.17. Do you need me to run a debug build of
KWin as well, or just enable DRM logs and save a snapshot covering this issue
happening?

I get these "atomic modeset failed" errors for other reasons too, like
switching between my HDMI outputs with a kscreen-doctor command.

My workaround helps most of the time by restarting everything, it's just a KWin
script doing this:

    print("Started plasmashell-fix watcher script")

    let restarted = false;
    const x = new QTimer()
    const y = new QTimer()
    x.timeout.connect(function() {
      print("timeout")
      callDBus(
        "org.freedesktop.systemd1",
        "/org/freedesktop/systemd1",
        "org.freedesktop.systemd1.Manager",
        "RestartUnit",
        "plasma-plasmashell.service",
        "replace",
        reply => {
          print(reply)
          restarted = true;
          y.start(5000);
        }
      );
    })
    x.singleShot = true
    y.timeout.connect(function() {
      print("restarted=false on a timer");
      restarted = false;
    });
    y.singleShot = true;


    workspace.windowRemoved.connect(function(client) {
      print(`DEBUG: windowRemoved - resourceClass: ${client.resourceClass},
dock? ${JSON.stringify(client.dock)}`);
      if (client.resourceClass === "plasmashell" && client.dock) {
        print("plasmashell dock disappeared")
        if (restarted) {
          print("ignoring this since we are post-restart");
          restarted = false;
        } else {
          x.start(3000);
        }
      }
    })

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