Suddenly no DisplayPort output

My Arch Linux Framework stopped outputting to monitor connected via DP cable. I tried another DP cable but nothing changed. When I unplug then replug a DP cable, I briefly see an icon that suggests that the laptop recognizes the connection and tries to output. The monitor also blinks than displays “No Signal” message.

> lspci
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14e8
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Device 14e9
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14ea
00:01.1 PCI bridge: Alspci
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14e8
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Device 14e9
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14ea
00:01.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 14ed
00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 14ed
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14ea
00:02.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 14ee
00:02.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 14ee
00:03.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14ea
00:03.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 19h USB4/Thunderbolt PCIe tunnel
00:04.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14ea
00:04.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 19h USB4/Thunderbolt PCIe tunnel
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14ea
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 14eb
00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 14eb
00:08.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 14eb
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 71)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f7
01:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL Upstream Port of PCI Express Switch (rev 12)
02:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL Downstream Port of PCI Express Switch (rev 12)
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi 33 [Radeon RX 7700S/7600/7600S/7600M XT/PRO W7600] (rev c1)
03:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Navi 31 HDMI/DP Audio
04:00.0 Non-Volatile memory controller: Sandisk Corp PC SN740 NVMe SSD (DRAM-less) (rev 01)
05:00.0 Network controller: MEDIATEK Corp. MT7922 802.11ax PCI Express Wireless Network Adapter
06:00.0 Non-Volatile memory controller: Sandisk Corp WD Black SN850X NVMe SSD (rev 01)
c5:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Phoenix1 (rev c1)
c5:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Rembrandt Radeon High Definition Audio Controller
c5:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 19h (Model 74h) CCP/PSP 3.0 Device
c5:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15b9
c5:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15ba
c5:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] ACP/ACP3X/ACP6x Audio Coprocessor (rev 63)
c5:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h/19h HD Audio Controller
c6:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Device 14ec
c6:00.1 Signal processing controller: Advanced Micro Devices, Inc. [AMD] AMD IPU Device
c7:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Device 14ec
c7:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15c0
c7:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15c1
c7:00.5 USB controller: Advanced Micro Devices, Inc. [AMD] Pink Sardine USB4/Thunderbolt NHI controller #1
c7:00.6 USB controller: Advanced Micro Devices, Inc. [AMD] Pink Sardine USB4/Thunderbolt NHI controller #2
dvanced Micro Devices, Inc. [AMD] Device 14ed
00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 14ed
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14ea
00:02.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 14ee
00:02.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 14ee
00:03.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14ea
00:03.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 19h USB4/Thunderbolt PCIe tunnel
00:04.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14ea
00:04.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 19h USB4/Thunderbolt PCIe tunnel
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14ea
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 14eb
00:08.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 14eb
00:08.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Device 14eb
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 71)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Device 14f7
01:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL Upstream Port of PCI Express Switch (rev 12)
02:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL Downstream Port of PCI Express Switch (rev 12)
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Navi 33 [Radeon RX 7700S/7600/7600S/7600M XT/PRO W7600] (rev c1)
03:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Navi 31 HDMI/DP Audio
04:00.0 Non-Volatile memory controller: Sandisk Corp PC SN740 NVMe SSD (DRAM-less) (rev 01)
05:00.0 Network controller: MEDIATEK Corp. MT7922 802.11ax PCI Express Wireless Network Adapter
06:00.0 Non-Volatile memory controller: Sandisk Corp WD Black SN850X NVMe SSD (rev 01)
c5:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Phoenix1 (rev c1)
c5:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Rembrandt Radeon High Definition Audio Controller
c5:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 19h (Model 74h) CCP/PSP 3.0 Device
c5:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15b9
c5:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15ba
c5:00.5 Multimedia controller: Advanced Micro Devices, Inc. [AMD] ACP/ACP3X/ACP6x Audio Coprocessor (rev 63)
c5:00.6 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h/19h HD Audio Controller
c6:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Device 14ec
c6:00.1 Signal processing controller: Advanced Micro Devices, Inc. [AMD] AMD IPU Device
c7:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Device 14ec
c7:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15c0
c7:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Device 15c1
c7:00.5 USB controller: Advanced Micro Devices, Inc. [AMD] Pink Sardine USB4/Thunderbolt NHI controller #1
c7:00.6 USB controller: Advanced Micro Devices, Inc. [AMD] Pink Sardine USB4/Thunderbolt NHI controller #2

> xrandr
Screen 0: minimum 16 x 16, current 2560 x 1600, maximum 32767 x 32767
eDP-2 connected primary 2560x1600+0+0 (normal left inverted right x axis y axis) 340mm x 220mm
   2560x1600    164.97*+
   2048x1536    164.95  
   1920x1440    164.87  
   1600x1200    164.88  
   1440x1080    164.85  
   1400x1050    164.77  
   1280x1024    164.81  
   1280x960     164.80  
   1152x864     164.77  
   1024x768     164.78  
   800x600      164.72  
   640x480      164.26  
   320x240      163.69  
   1920x1200    164.87  
   1680x1050    164.82  
   1440x900     164.74  
   1280x800     164.81  
   1152x720     164.77  
   960x600      164.72  
   928x580      164.51  
   800x500      164.66  
   768x480      164.47  
   720x480      164.67  
   640x400      164.67  
   320x200      161.83  
   2560x1440    164.90  
   2048x1152    164.90  
   1920x1080    164.83  
   1600x900     164.77  
   1368x768     164.98  
   1280x720     164.71  
   1024x576     164.94  
   864x486      164.71  
   720x400      164.23  
   640x350      164.46

Check which kernel you have booted.
Try using an older kernel. On Ubuntu type systems we also had a problem with a regression.

Currently using Linux 6.9.7-arch1-1.

Boot an older/backup kernel and check if it works.

Switched to Linux 6.6.36-1-lts but still no DP output. Do any of these logs stand out?

> sudo journalctl -b | grep -i 'wayland.*]: '
Jul 05 12:14:08 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.freedesktop.systemd1' requested by ':1.2' (uid=120 pid=1710 comm="/usr/lib/gnome-session-binary --autostart /usr/sha")
Jul 05 12:14:08 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activated service 'org.freedesktop.systemd1' failed: Process org.freedesktop.systemd1 exited with status 1
Jul 05 12:14:08 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.a11y.Bus' requested by ':1.4' (uid=120 pid=1722 comm="/usr/bin/gnome-shell")
Jul 05 12:14:08 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'org.a11y.Bus'
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1791]: dbus-daemon[1791]: Activating service name='org.a11y.atspi.Registry' requested by ':1.0' (uid=120 pid=1722 comm="/usr/bin/gnome-shell")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1791]: dbus-daemon[1791]: Successfully activated service 'org.a11y.atspi.Registry'
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1795]: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.gnome.Shell.Screencast' requested by ':1.3' (uid=120 pid=1722 comm="/usr/bin/gnome-shell")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.freedesktop.impl.portal.PermissionStore' requested by ':1.3' (uid=120 pid=1722 comm="/usr/bin/gnome-shell")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'org.freedesktop.impl.portal.PermissionStore'
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.gnome.Shell.Notifications' requested by ':1.3' (uid=120 pid=1722 comm="/usr/bin/gnome-shell")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'org.gnome.Shell.Notifications'
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.freedesktop.portal.IBus' requested by ':1.10' (uid=120 pid=1850 comm="ibus-daemon --panel disable")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'org.freedesktop.portal.IBus'
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.freedesktop.systemd1' requested by ':1.13' (uid=120 pid=1849 comm="/usr/lib/gsd-sharing")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activated service 'org.freedesktop.systemd1' failed: Process org.freedesktop.systemd1 exited with status 1
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.gnome.ScreenSaver' requested by ':1.26' (uid=120 pid=1955 comm="/usr/lib/gsd-power")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1856]: Xlib:  extension "DRI2" missing on display ":1024".
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1856]: Xlib:  extension "DRI2" missing on display ":1024".
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'org.gnome.ScreenSaver'
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.freedesktop.portal.IBus' requested by ':1.34' (uid=120 pid=2118 comm="ibus-daemon --panel disable -r --xim")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'org.freedesktop.portal.IBus'
Jul 05 12:14:10 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'org.gnome.Shell.Screencast'
Jul 05 12:14:18 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='ca.desrt.dconf' requested by ':1.3' (uid=120 pid=1722 comm="/usr/bin/gnome-shell")
Jul 05 12:14:18 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'ca.desrt.dconf'

> sudo journalctl -b | grep -i 'gdm.*]: '
Jul 05 12:14:07 archlinux gdm-launch-environment][1674]: pam_systemd(gdm-launch-environment:session): New sd-bus connection (system-bus-pam-systemd-1674) opened.
Jul 05 12:14:08 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.freedesktop.systemd1' requested by ':1.2' (uid=120 pid=1710 comm="/usr/lib/gnome-session-binary --autostart /usr/sha")
Jul 05 12:14:08 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activated service 'org.freedesktop.systemd1' failed: Process org.freedesktop.systemd1 exited with status 1
Jul 05 12:14:08 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.a11y.Bus' requested by ':1.4' (uid=120 pid=1722 comm="/usr/bin/gnome-shell")
Jul 05 12:14:08 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'org.a11y.Bus'
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1791]: dbus-daemon[1791]: Activating service name='org.a11y.atspi.Registry' requested by ':1.0' (uid=120 pid=1722 comm="/usr/bin/gnome-shell")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1791]: dbus-daemon[1791]: Successfully activated service 'org.a11y.atspi.Registry'
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1795]: SpiRegistry daemon is running with well-known name - org.a11y.atspi.Registry
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.gnome.Shell.Screencast' requested by ':1.3' (uid=120 pid=1722 comm="/usr/bin/gnome-shell")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.freedesktop.impl.portal.PermissionStore' requested by ':1.3' (uid=120 pid=1722 comm="/usr/bin/gnome-shell")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'org.freedesktop.impl.portal.PermissionStore'
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.gnome.Shell.Notifications' requested by ':1.3' (uid=120 pid=1722 comm="/usr/bin/gnome-shell")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'org.gnome.Shell.Notifications'
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.freedesktop.portal.IBus' requested by ':1.10' (uid=120 pid=1850 comm="ibus-daemon --panel disable")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'org.freedesktop.portal.IBus'
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.freedesktop.systemd1' requested by ':1.13' (uid=120 pid=1849 comm="/usr/lib/gsd-sharing")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activated service 'org.freedesktop.systemd1' failed: Process org.freedesktop.systemd1 exited with status 1
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.gnome.ScreenSaver' requested by ':1.26' (uid=120 pid=1955 comm="/usr/lib/gsd-power")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1856]: Xlib:  extension "DRI2" missing on display ":1024".
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1856]: Xlib:  extension "DRI2" missing on display ":1024".
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'org.gnome.ScreenSaver'
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='org.freedesktop.portal.IBus' requested by ':1.34' (uid=120 pid=2118 comm="ibus-daemon --panel disable -r --xim")
Jul 05 12:14:09 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'org.freedesktop.portal.IBus'
Jul 05 12:14:10 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'org.gnome.Shell.Screencast'
Jul 05 12:14:11 archlinux gdm-password][2184]: pam_systemd_home(gdm-password:auth): New sd-bus connection (system-bus-pam-systemd-home-2184) opened.
Jul 05 12:14:18 archlinux gdm-password][2184]: gkr-pam: unable to locate daemon control file
Jul 05 12:14:18 archlinux gdm-password][2184]: gkr-pam: stashed password to try later in open session
Jul 05 12:14:18 archlinux gdm-password][2184]: pam_unix(gdm-password:session): session opened for user a(uid=1000) by a(uid=0)
Jul 05 12:14:18 archlinux gdm-password][2184]: pam_systemd(gdm-password:session): New sd-bus connection (system-bus-pam-systemd-2184) opened.
Jul 05 12:14:18 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Activating service name='ca.desrt.dconf' requested by ':1.3' (uid=120 pid=1722 comm="/usr/bin/gnome-shell")
Jul 05 12:14:18 archlinux /usr/lib/gdm-wayland-session[1709]: dbus-daemon[1709]: [session uid=120 pid=1709] Successfully activated service 'ca.desrt.dconf'
Jul 05 12:14:18 archlinux gdm-password][2184]: gkr-pam: unlocked login keyring
Jul 05 12:14:18 archlinux gdm[1656]: Gdm: on_display_added: assertion 'GDM_IS_REMOTE_DISPLAY (display)' failed
Jul 05 12:14:21 archlinux gdm-launch-environment][1674]: pam_systemd(gdm-launch-environment:session): New sd-bus connection (system-bus-pam-systemd-1674) opened.
Jul 05 12:14:21 archlinux gdm[1656]: Gdm: Child process -1702 was already dead.
Jul 05 12:14:21 archlinux gdm[1656]: Gdm: on_display_removed: assertion 'GDM_IS_REMOTE_DISPLAY (display)' failed

Nope - nothing that actually triggers anything for me.

Which port are you plugging the Display Port cable into?
Left, Right, Back ?