Configure the TV input type to "PC" using LGWebOSRemote

configure-tv-input.sh

#!/bin/bash

APPID=$(lgtv --name MyTV --ssl getForegroundAppInfo | head -n 1 | python3 -c "import sys, json; print(json.load(sys.stdin)['payload']['appId'])")

lgtv --name MyTV --ssl startApp com.webos.app.homeconnect && sleep 6
lgtv --name MyTV --ssl sendButton up up right enter && sleep 2
lgtv --name MyTV --ssl sendButton enter && sleep 2

# number of `down`s here depends on the input ID; in this case I'm configuring HDMI 3
lgtv --name MyTV --ssl sendButton down down down left enter && sleep 2

lgtv --name MyTV --ssl sendButton down down down down down down down down down enter && sleep 2

# as noted above, number of `up`s here depends on input ID
lgtv --name MyTV --ssl sendButton up up up right enter && sleep 2

lgtv --name MyTV --ssl startApp $APPID

Configure-TvInput.ps1

$appid = (lgtv --name MyTV --ssl getForegroundAppInfo | ConvertFrom-Json).payload.appid
lgtv --name MyTV --ssl startApp com.webos.app.homeconnect
Start-Sleep 6
lgtv --name MyTV --ssl sendButton up up right enter
Start-Sleep 2
lgtv --name MyTV --ssl sendButton enter
Start-Sleep 2
lgtv --name MyTV --ssl sendButton down down down left enter
Start-Sleep 2 # number of `down`s here depends on the input ID in this case I'm configuring HDMI 3
lgtv --name MyTV --ssl sendButton down down down down down down down down down enter
Start-Sleep 2
lgtv --name MyTV --ssl sendButton up up up right enter
Start-Sleep 2 # as noted above, number of `up`s here depends on input ID
lgtv --name MyTV --ssl startApp $appid

This requires https://github.com/klattimer/LGWebOSRemote (latest as of Jan 2024)

TODO: set up a Hammerspoon script to run this automatically when HDMI is connected to the Macbook.

Linux/macOS version moved to dotfiles repo with better error handling. See https://github.com/alimbada/dotfiles/blob/macos/bin/configure-tv-input.sh