Bug#1125275: mutter: Black screen on an HDMI monitor after loading Gnome Wayland session on a laptop with AMD Radeon graphics

[Nazik]

Package: mutter
Version: 48.7-0+deb13u1
Severity: important
X-Debbugs-Cc: nazarii.kretovych at gmail.com

Hi. Today, I ran "apt upgrade" on my laptop. There were a lot of updates (13.2 -> 13.3). I've noticed that gnome-shell was updated from 48.4 to 48.7.

My laptop is connected to an external monitor via HDMI. When I boot it, i can see GDM login screen on the internal screen, and I can see GDM's gray background on the external monitor.
All is ok here. But after I type login and password, both the external and internal screens are OFF, and I can't use my system. In Gnome Settings, I always turn off the internal screen.

Black screen appeared immediately after the 13.2->13.3 upgrade.

My laptop is Lenovo ThinkPad AMD Ryzen™ 5 7530U with Radeon™ Graphics × 12.

I also have an old Macbook 2012 Pro with Intel HD graphics. The issue does not happen there.

I also checked if the issue happens in the prev. kernel 6.12.57. It also happens with the older kernel. I suspect there is a bug in mutter / gnome-shell, but I am not 100% sure.

-- System Information:
Debian Release: 13.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.63+deb13-amd64 (SMP w/12 CPU threads; PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB.UTF-8
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages mutter depends on:
ii  adwaita-icon-theme            48.1-1
ii  gnome-settings-daemon-common  48.1-1
ii  gsettings-desktop-schemas     48.0-1
ii  libc6                         2.41-12+deb13u1
ii  libgles2                      1.7.0-1+b2
ii  libglib2.0-0t64               2.84.4-3~deb13u2
ii  libmutter-16-0                48.7-0+deb13u1
ii  mutter-common                 48.7-0+deb13u1

mutter recommends no packages.

Versions of packages mutter suggests:
ii  gnome-control-center  1:48.4-1~deb13u1
ii  xdg-user-dirs         0.18-2