X.Org Screen Management – How to Disable Part of the Screen

i3linuxxorg

I'm running a Laptop with Arch Linux, X.org and i3. Due to a broken LCD panel, I would like to disable/ignore the left ~228 Pixels of the screen until I have time to get it repaired.

So far, I've tried using a non-standard resolution and then adding an offset, but had no success. Is there any simple solution for this?

Best Answer

You can use xrandr.

I have tested this breathy on a single monitor.

First look at current resolution and subtract 228 from X. Replace X and Y below for new resolutions Y=y, X=x-228. (note in the text below lower case x is a literal x). Run xrandr to get output name.

Then xrandr --fb XxY --output OUTPUT_NAME --transform 1,0,-228,0,1,0,0,0,1

Disable Built-In Keyboard and Trackpad with InputClass

One can disable the built-in devices by setting the Ignore option in an input class to true or on. The necessary information to match the devices can usually be gathered from /var/log/Xorg.0.log.

I chose to place my disabling sections in the evdev configuration file that was already present, since on my system both devices use the evdev driver. The sections could just as easily go somewhere else, but I'm unsure about the precedence of the matching rules and decided to play it safe by placing the rules in the same file above other devices that contain a Driver "evdev" line.

# /etc/X11/xorg.conf.d/10-evdev.conf

Section "InputClass"
        Identifier      "Built-In Touchpad"
        MatchIsTouchpad "on"
        MatchProduct    "SynPS/2 Synaptics TouchPad"
        Option          "Ignore" "true"
EndSection

Section "InputClass"
    Identifier          "Built-In Keyboard"
    MatchIsKeyboard     "on"
    MatchProduct        "AT Translated Set 2 keyboard"
    Option              "Ignore" "true"
EndSection

Best Answer

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How to automatically disable the laptop’s built-in keyboard in X.org

Disable Built-In Keyboard and Trackpad with InputClass

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