System configuration:
- Dell XPS 13 9310 2-in-1 laptop
- Intel i7 11th Gen
- Mesa Intel XE Graphics (TGL GT2)
- Ubuntu 22.04 LTS 64 bit
- Gnome version 42.5
- Wayland windowing system
External displays used:
- Dell S2817Q (4k)
- HP 2509M
HDMI to USB-C Adapter used:
I used HP 2509M for around 3-4 months and suddenly one day, the external display brightness just dimmed. I had not changed any brightness settings at all, neither on the laptop nor on the external display itself. Then I switched to the Dell display and after roughly the same amount of time, I am facing the same issue with this display. Issue persists irrespective of extended display mode - single, mirror or extend.
Triaging
- Tried upgrading the display drivers, and also tried the xrandr command, but to no effect.
| xrandr -q |grep " connected"
XWAYLAND12 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 620mm x 340mm
| xrandr --output XWAYLAND12 --brightness 0.9
Tried changing the USB-C to HDMI adapter to isolate if the issue is in the adapter, issue persists even with a different adapter.
Tried connecting external display to a Windows machine, external display brightness is fine.
