https://bugs.freedesktop.org/show_bug.cgi?id=80678
--- Comment #2 from Harald Judt h.judt@gmx.at --- No, it doesn't work with glamor either. Besides, I'd like to use EXA because of xv support.
Actually, I notice one difference after executing xrandr --fb 1920x2400 --output HDMI-0 --mode 1920x1200 --scale-from 1920x2400
The vertical panel seems to stretch/extend to the new vertical size (2400). However, the intended scaling doesn't get applied.
xrandr --verbose before and after this command shows no differences.