Popup menus are not positioned properly (Linux GNOME)

[limbonaut]

Godot version

4.2-rc [ad72de5]

System information

Manjaro Linux, X11 (X.Org), Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3060 Laptop GPU () - 11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz (16 Threads)

Issue description

When created close to the screen's edge, popup menus are cut off intead of being properly positioned (GNOME 45, Manjaro Linux). This happens while Single Window Mode is disabled.
Didn't test in other Linux Distro + DE combinations.
I can reproduce it in 4.0.2 and 4.1.3.

Workarounds

a) Use Single Window Mode (enabled in Editor Settings).
b) Use nvidia_drm.modeset=1 kernel option.

Steps to reproduce

1. Build & run the latest Godot 4.2-rc on the GNOME v45 desktop.
2. Right-click on a property in the Inspector close to the screen's edge.

Minimal reproduction project

N/A

[Calinou]

Try enabling Single Window Mode in the Editor Settings and see if this resolves the issue.

Also, can you reproduce this in 4.1.3?

[limbonaut]

@Calinou
I use X.Org, didn't test with Wayland. Single Window Mode helps the issue, thanks, but we loose the floating windows functionality. It's a workaround if you don't need those. I'll add it into the OP.

[limbonaut]

@Calinou
I can reproduce it in 4.0.2 and 4.1.3.

[Sauermann]

I am unable to replicate this problem on Debian X11 Xfce with v4.2.beta.custom_build [c455cb6] when using only Godot builtin nodes.
Does this happen only for your BTPlayer node or also for standard nodes?

[limbonaut]

@Sauermann
On builtin node properties too. Happens also on official builds version 4.1.3 and 4.0.2. It only breaks when Single Window Mode is disabled.

[Calinou]

I can't reproduce this on 4.2.beta da0b1eb (Fedora 39, KDE Plasma 5.27.9). Even if I resize the window to a tiny size (using KDE window overrides to disable Godot's minimum size) and spawn a context menu while the window is on the right edge of the screen, the context menu is positioned correctly:

[limbonaut]

I finally figured it out! So I found out that it only happens with Linux kernel 6.5 and 6.6 (Intel+NVIDIA laptop with X11) and is somehow related to simpledrm driver. I can't reproduce it on kernel 6.1.
When this bug happens, I also have the following weird thing - when I run xrandr my output shows a ghost monitor device None-1-1:

> xrandr
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-4 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
   1920x1080    165.00*+
None-1-1 connected (normal left inverted right x axis y axis)
   1920x1080     60.00 +

To fix it, I added this kernel option to /etc/default/grub:

# /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="nvidia_drm.modeset=1"

Then I ran update-grub and rebooted.
Enabling nvidia_drm.modeset disables simpledrm. Both ghost device and the popup menus in Godot stopped being an issue for me, at least for now.

[Calinou]

I doubt we can do about anything if there's no way to detect this "ghost" monitor from Godot. It's also a system configuration issue that will negatively affect other applications anyway, so it's better to fix it on your end.