J Leslie Turriff composed on 2025-08-23 14:15 (UTC-0500):
OTOH, on this machine, /etc/trinity/tdedisplay/ is empty,
| @14:02:05 leslie@pinto | wd=/home/leslie | $ ls -l /etc/trinity/tdedisplay/ | total 0 | rc=0
so maybe just removing that config file will fix it?
Personal settings like display setup are in ~/.trinity/. Display settings you can change from KControl don't go anywhere in /etc/trinity/ I remember ever seeing, except for in tdmrc, where I don't think screen resolution is any of the possibles. If I had to guess which file causes the trouble, it would be either kdeglobals or twinrulesrc:
ls -gGlrt | tail
-rw------- 1 2113 Aug 23 15:57 twinrc -rw-rw-r-- 1 333 Aug 23 16:05 startupconfigkeys -rw------- 1 2787 Aug 23 16:06 kickerrc -rw------- 1 63 Aug 23 16:06 knotifyrc -rw-rw-r-- 1 1516 Aug 23 16:06 gtkrc -rw-rw-r-- 1 1550 Aug 23 16:06 gtkrc-2.0 -rw------- 1 215 Aug 23 16:06 khelpcenterrc -rw------- 1 1070 Aug 23 16:08 twinrulesrc -rw------- 1 6562 Aug 23 16:08 kdeglobals -rw------- 1 16 Aug 23 16:08 kiccconfigrc
Before messing with config files, if this is basically about a screen resolution problem you can try dropping a one-line file with xrandr in:
Debian/*buntu: /etc/X11/Xsession.d/ openSUSE/Fedora: /etc/X11/xinit/xinitrc.d/
to set resolution automatically as the session starts, e.g.:
xrandr --dpi 100 --output HDMI-1 --mode 1600x900 --rate 60
Set to at least on thing that you know is supported but not the normal default, to tip the session that an override of EDID is desired. If this helps, then remove that file or change it before next session start to include only settings you really want applied.