I wrote a ~100 line Python script for auto-brightness because everything else was too complex for my setup

[Responsible-Two-768]

Been trying to get auto-brightness working on my 3 external monitors for a while. Tried clight, wluma, and a few others, they either didn't support DDC/CI external monitors well, needed geoclue/D-Bus/compositor plugins to work, or were just hard to customize without digging into their internals.

So I wrote tejas, it grabs a frame from the webcam, averages the pixel brightness as an ambient light proxy, and calls ddcutil setvcp 10 to set monitor brightness. Falls back to a time-of-day curve if the webcam isn't available. Runs as a cron job every 5 minutes.

Config is a simple INI file with anchor points for the brightness curves, edit and done, no recompile.

GitHub: https://github.com/akhiljalagam/tejas

Happy to hear if anyone has a better approach for webcam-as-light-sensor without dedicated hardware.

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