To change the refresh rate, use the -r option with the refresh rate in Hz (only certain
values are permitted at each resolution; see the output of xrandr -q earlier). To select
a 70 Hz refresh rate:
$ xrandr -r 70
Some displays permit reflection??”mirroring the image left-to-right or top-to-bottom.
This can be useful for rear projection applications. The -x and -y options control vertical
and horizontal reflection: if they are present, then the image will be reflected.
Most drivers do not provide reflection capability. Some provide rotation
only when enabled in the X server configuration file; for example,
the closed-source NVIDIA driver requires the entry Option
"RandRRotation" to be added to the Device section of the configuration
file to enable rotation using RANDR.
KDE provides an applet, krandr, which can be added to your panel bar. Clicking on
the krandr icon will present a list of available resolutions, rotations, reflections, and
refresh rates; simply click on the value you wish to use. A similar program named
gnome-display-properties is included in Gnome.
5.4 Using the Middle Mouse Button
The Mac GUI was designed to work optimally with a one-button mouse; Microsoft
Windows was designed for two buttons; and the X Window System works best with
at least three buttons.
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