For strange reasons best not asked, I have a projector plugged into my computer that is pointed at a mirror. So the computer image is displayed on a wall, but it is mirrored.
In Linux(ubuntu) I can go to display preferences and set the external monitor to have a rotated image. Is there a clever way I could have it set to rotate/flip the image?
Best Answer
Ok after testing with 2 PC. I found the following:
On some integrated cards like Intel you can use xrandr in console. For example:
Go to console (Ctrl+Alt+T)
xrandr -x
will flip de video horizontally like a mirror.xrandr -y
will flip de video vertically.xrandr -y -x
will flip both.xrandr -o normal
will return to normal the video.xrandr -o inverted
will...invert O.oBut if you have (in my case) an Nvidia this will most likely not work. For an Nvidia to work you need to:
Edit you xorg.conf:
sudo nano /etc/X11/xorg.conf
Finde the section that has Driver "nvidia" in it
Copy and paste the following at the end of that section: Option "RandRRotation" "on"
This will activate the rotation for Nvidia which comes off by default. Why off by default i do not know.
After that reboot and you can change the orientation BUT NOT the reflection. What i mean with this is that Nvidia does not yet support reflection options like -x or -y options in xrandr. I will keep searching for some more since the question is interesting.