Pardon my globbish.
I’m using 2 monitors, landscape+portrait mode. At startup, the latter is well oriented but not properly offset.
This is my .config/openbox/autostart:
# écrans dell+philips
xrandr --output DP1 --off --output DP2 --off --output HDMI1 --off --output HDMI2 --mode 1280x1024 --pos 0x0 --rotate normal --output VGA1 --mode 1024x768 --pos 1280x0 --rotate left --right-of HDMI2 --output VIRTUAL1 --off &
# required for xfce settings to work
xfsettingsd &
# start the panel
tint2 &
# load wallpaper
nitrogen --restore &
Maybe some setting is overriding this one.
But where to look at ?