E-mail from customer:
I have an ASUS ROG PG348 monitor, which I have successfully used with Debian on ThinkPad T570, over HDMI, ith out any custom tweaks - it was detected and worked at native resolution of 3440x1440 60Hz.
On Librem 15, over HDMI, with either PureOS or Debian, with or without manually-copied non-free firmware, the initial boot steps output to the monitor at 3440x1440 50Hz, then, right before prompting to decrypt the drive - the outputted resolution switches to 1920x1080 60Hz. From that point on - it is the maximum resolution reported by xrandr (I tried and failed to add the missing mode using a modeline generated by cvt).
Would highly appreciate your help in getting the correct resolution to work!
I own an LG 29WK600-W that has a native resolution of 2560x1080 (21:9) but GNOME won't even show that as an option, only 1920x1080 (16:9).
Is there any way to manually add resolutions (like the 21:9 ones) in PureOS since it runs Wayland? Or is there another way to fix this issue?