
私は定期的にノートパソコンを授業に使用し、プロジェクターに全画面を表示しています。プロジェクターの性能が上がるにつれて、プロジェクターの解像度が LCD 画面の解像度よりも高かったり、異なっていたりすることがよくあります (以前は 1024x768 のみを使用していました)。
What I now would like to do is use the best resolution of the external display, while having the same content down-scaled on the notebook screen (without panning). Alternatively, if the resolution of the projector is smaller in one dimension, black bars would be ok on the LC display. I don't worry about aliasing artefacts on the LCD as long as the external projector uses the highest quality possible.
For example, I recently had:
LVDS1 connected 1280x800+0+0
1280x800 60.2*+ 50.0
...
VGA1 connected 1280x720+0+0
1280x720 60.0*+
...
I tried:
xrandr --output VGA1 --mode 1280x720 --output LVDS1 --mode 1280x800
but then the bottom of a full screen presentation was clipped on the projector. In this case, I would like a black bar or vertical rescaling on the laptop screen. How can I achieve that?
I played with the scale option (can't reproduce this here without projector) but was unsuccessful.
How can I achieve this behaviour?
答え1
I figured out that the --scale-from
option does what I need:
xrandr --output VGA1 --mode 1280x720 --output LVDS1 --primary --scale-from 1280x720