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The first method I googled is to add a line in the
[Device] session of
… and it works. But that option unfortunatelly disables Compiz (now default installed in every Ubuntu) and Beryl — Accroding to X.org documentation,
Rotate option disables RandR extension which is required for Beryl to start up.
I ended up using another method to do the rotatation: Since RandR would able to rotate the screen itself by
xrandr command, I then removed the line in
xorg.conf and add the following command in
xrandr -o 3
Anything works fine now; Beryl starts as expected. It’s odd to see the Beryl cube become a cuboid though. No screenshots – I haven’t figure out how to do it under Linux.
P.S. I believe a 900×1440 screen is called a “Long screen” instead of a “Tail screen”. I was wrong and unable to figure out these fine difference of adjectives in English.