What's a unique customization on your Linux machine you think no one else has?
Just wondering since I know a lot of people quietly use a screen-area-select -> tesseract OCR -> clipboard shortcut.
I separate subjects of interest into different Firefox windows, in different workspaces -- so I have an extension title them and a startup script parse text to ask the compositor to put them in the correct workspace (lets me restart more conveniently).
I have automatically-set different-orientation wallpapers for using my 2-in-1 depending on whether I use it in portrait or landscape (kind of just for looks, but I don't think if anyone else adds a wallpaper change to their screen rotation keybind).
I've got a RPI running a full-screen 'kiosk' view from homeassitant that turns an external display on/off based on a motion sensor.
So basically it's showing current temperatures, thermostat control, etc. but I have the display turn off after X minutes of no movement and turn on when there has been movement so it's only on when you're in the room.
I have a similar display in my kitchen. It's in portrait mode and has time (my timezone and others), weather (hourly and daily), and dynamic popups for weather alerts in the top 1/3. It has a spot for dynamic content below that that shows things like time remaining for my espresso machine to heat up and the temperature of my ember mug if I'm using it. The bottom half of the screen flips every 15 seconds between calenders for my partner and I, and local scheduled transit times and live train times with a map of current train positions.
Much simpler than that - The motion sensors are zigbee and integrated with HomeAssistant. I have a HA automation that sends a REST call to a webservice I wrote on the PI that then just needs to write 1 or 0 to /sys/class/backlight/rpi_backlight/bl_power.
It's one of these. I don't know the chip but I haven't had any issues with false positives. If anything they're slightly under sensitive, but not enough to be a deal breaker for my purposes.