I have an annoying problem with my 2nd monitor not activating after sleep or reboot.
I’ve had this problem from day-1 of my EOS/KDE install.
I have an Asus Zenbook S16 connected to an Asus DC500 dock (via USB4/Thunderbolt) which connects via HDMI to an external BenQ GL2580 external screen. Both screens work perfectly under Windows11 (yuk), so I know it’s not a bandwidth/hardware problem.
Symptoms: After waking from sleep or reboot, the BenQ screen is blank (no signal). Opening the KDE Display Configuration in system settings, most times the BenQ is listed as an available and enabled device, just no signal. After several attempts (sometimes dozens) to disable/enable/disable/enable/etc. or logout/login, the monitor it will sometimes just start working.
Another minor annoyance is that the part of the display configuration control where you drag screens to rearrange them, no longer shows the BenQ monitor at all (it used to).
I’m wondering if this is an actual bug with the Kwin/SDDM or a configuration problem. I used my Ventoy to boot a live ISO of Gnome Ubuntu and it detected both screens fine in the live environment (LXQt Ubuntu did NOT however).
Below is a screenshot of my current config when it’s working, and a dump of inxi. With everything working, I can load up Steam and play games with no dropped frames (so AMDGPU is also working fine). Let me know if you have any advice on where to look or commands to use to try and fix this. I’d really rather not have to install Gnome just to get this working.
[Laptop]–TB4 cable–[Dock]–HDMI cable–[monitor]
$ inxi -b
System:
Host: erik-um5606wa Kernel: 6.14.4-arch1-2 arch: x86_64 bits: 64
Desktop: KDE Plasma v: 6.3.4 Distro: EndeavourOS
Machine:
Type: Laptop System: ASUSTeK product: ASUS Zenbook S 16 UM5606WA_UM5606WA
v: 1.0 serial: <superuser required>
Mobo: ASUSTeK model: UM5606WA v: 1.0 serial: <superuser required>
UEFI: American Megatrends LLC. v: UM5606WA.317 date: 03/21/2025
Battery:
ID-1: BAT0 charge: 59.7 Wh (79.5%) condition: 75.1/78.0 Wh (96.3%)
volts: 8.3 min: 8.0
CPU:
Info: 12-core AMD Ryzen AI 9 HX 370 w/ Radeon 890M [MT MCP] speed (MHz):
avg: 1951 min/max: 599/5157:3289
Graphics:
Device-1: Advanced Micro Devices [AMD/ATI] Strix [Radeon 880M / 890M]
driver: amdgpu v: kernel
Device-2: Shinetech ASUS FHD webcam driver: hid-sensor-hub,usbhid,uvcvideo
type: USB
Display: wayland server: X.org v: 1.21.1.16 with: Xwayland v: 24.1.6
compositor: kwin_wayland driver: X: loaded: amdgpu unloaded: modesetting
dri: radeonsi gpu: amdgpu resolution: 1: 1920x1080~60Hz 2: 2880x1800~120Hz
API: OpenGL v: 4.6 compat-v: 4.5 vendor: amd mesa v: 25.0.5-arch1.1
renderer: AMD Radeon Graphics (radeonsi gfx1150 LLVM 19.1.7 DRM 3.61
6.14.4-arch1-2)
Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
de: kscreen-console,kscreen-doctor wl: wayland-info
x11: xdpyinfo, xprop, xrandr
Network:
Device-1: MEDIATEK driver: mt7925e
Device-2: Realtek USB 10/100/1G/2.5G LAN driver: r8152 type: USB
Drives:
Local Storage: total: 3.64 TiB used: 36.59 GiB (1.0%)
Info:
Memory: total: 32 GiB note: est. available: 30.46 GiB used: 3.9 GiB (12.8%)
Processes: 435 Uptime: 9m Shell: Bash inxi: 3.3.38
$ lspci -k -d ::03xx
c4:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Strix [Radeon 880M / 890M] (rev c1)
Subsystem: ASUSTeK Computer Inc. Device 1df3
Kernel driver in use: amdgpu
Kernel modules: amdgpu
