This document is a WORK IN PROGRESS.
This is just a quick personal cheat sheet: treat its contents with caution!

`xrandr`¶

Prerequisite(s)

Reference(s)

Table of contents¶

Install xandr:

Detect devices:

# xrandr -q # to detect devices names and states

Turn the specified monitor output on (e.g. HDMI-1) and set the preferred resolution automatically (default to max resolution):
```
$ xrandr --output HDMI-1 --auto
```
Change the resolution of the specified monitor and change it's refresh rate:
```
$ xrandr --output HDMI-1 --mode 1920x1080 --rate 60
```
Duplicate main monitor (e.g. eDP1) to second monitor (e.g. DP1):
```
$ xrandr --output DP1 --auto --same-as eDP1 --auto
```
Turn off main monitor (e.g. eDP1) but not second monitor (e.g. DP1):
```
xrandr --output eDP1 --off --output DP1 --auto
```

Turn on main monitor (e.g. eDP1) and second monitor (e.g. DP1):

xrandr --output eDP1 --primary --auto --output DP1 --right-of eDP1 --auto.

TODO

If the cursor moves with startx run as root but not when run as a user:

If not, it might be related to this problem:

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