Additional info:
It is enough to execute
xrandr --output LVDS1 --off
xrandr --output VGA1 --auto
to reproduce the problem. In my case the latter forces a resolution adjustment that I think has something to do with the problem.
The problem also show when combining the above into selections in lxrandr.
It is also intermittent. On rare occasions it actually work as supposed. I haven't figured out what makes a difference.
Additional info:
It is enough to execute
xrandr --output LVDS1 --off
xrandr --output VGA1 --auto
to reproduce the problem. In my case the latter forces a resolution adjustment that I think has something to do with the problem.
The problem also show when combining the above into selections in lxrandr.
It is also intermittent. On rare occasions it actually work as supposed. I haven't figured out what makes a difference.