Monitor can't go in standby with monitor's "Auto" mode
System information
System:
Host: enrico-kubuntu Kernel: 6.2.0-32-generic arch: x86_64 bits: 64
compiler: N/A Desktop: KDE Plasma v: 5.27.8 tk: Qt v: 5.15.8 wm: kwin_x11
dm: SDDM Distro: Ubuntu 23.04 (Lunar Lobster)
CPU:
Info: 12-core (4-mt/8-st) model: 12th Gen Intel Core i5-1240P bits: 64
type: MST AMCP arch: Alder Lake rev: 3 cache: L1: 1.1 MiB L2: 9 MiB
L3: 12 MiB
Speed (MHz): avg: 1920 high: 2100 min/max: 400/4400:3300 cores: 1: 2100
2: 2100 3: 2100 4: 2100 5: 668 6: 2100 7: 663 8: 2100 9: 2100 10: 2100
11: 2100 12: 2100 13: 2100 14: 2100 15: 2100 16: 2100 bogomips: 67584
Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
Device-1: Intel Alder Lake-P Integrated Graphics driver: i915 v: kernel
arch: Gen-12.2 ports: active: HDMI-A-2 empty: DP-1, DP-2, DP-3, DP-4,
HDMI-A-1 bus-ID: 00:02.0 chip-ID: 8086:4626
Display: x11 server: X.Org v: 1.21.1.7 with: Xwayland v: 22.1.8
compositor: kwin_x11 driver: X: loaded: modesetting unloaded: fbdev,vesa
dri: iris gpu: i915 display-ID: :0 screens: 1
Screen-1: 0 s-res: 1920x1080 s-dpi: 96
Monitor-1: HDMI-A-2 mapped: HDMI-2 model: Idek Iiyama PL2492H
res: 1920x1080 dpi: 93 diag: 604mm (23.8")
API: OpenGL v: 4.6 Mesa 23.0.4-0ubuntu1~23.04.1 renderer: Mesa Intel
Graphics (ADL GT2) direct-render: Yes
Describe the issue
My monitor has an "auto" mode that automatically switch the input soruce (HDMI or DisplayPort). It works fine on X11 and on Windows, but not on Wayland. When I'm on Wayland the monitor never goes in standby, it's always-on. I've tested it on Ubuntu/Kubuntu/Fedora both on Gnome and KDE.
Please let me know if I can provide any other useful informations. My monitor is an iiyama ProLite XUB2492HSU-B1 but I've read of similar problems with other monitors (older posts in other websites so I'm not sure if they are exactly the same problem).