On Thu, Jun 11, 2020, 08:20 Daniel Morris
[sorry for the lag, I'd left this in my drafts box after a few days of futzing with the setup]
Hi Felix,
Thanks for the suggestions, greatly appreciated and got me something that works. After lots of (literal) head-banging under my desk by swapping cables and outputs I've come up with a repeatable workaround:
Power off the screen (front panel switch) Jump to virtual console one (Ctrl-Alt-F1) Power up the screen (starts at 2560x1440 @75Hz) Ctrl-Alt-F7 back to X and slide the resolution from 1920x1080 to 2560x1440 from Plasma & apply.
About half the time Plasma/X wakes at 2560x1440 without needing to do this.
2560x1440 is only available on the Display Port connector, all other outputs were limited to 1920x1080. I've found with such a large monitor at hi-res that I can work effectively with just one screen, which has simplified things.
I can't find any AOC firmware update and am on the lastest BIOS update. The above isn't ideal, but it works, everytime.
Thanks, Daniel
.
What graphics and CPU are you using? Single screen via DP? Running X or Wayland? KDE or Gnome? I have 15.1 with i5-8259U (HDMI) and i5-6260U (DP) using internal graphics driving Dell display at 3840x2160 refreshing at 60Hz without doing anything special. So, depending on your graphics, the Intel driver should be able to drive your screen just fine. The problem maybe in your monitor EDID data. What does: xrandr --verbose tells you about what the monitor support? Is your desired refresh rate and resolution supported by the screen? I am no expert, perhaps comparing notes can help you get to the bottom of it. Hope it helps, Tomas