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petitJAM/ddcutil_cheat_sheet.md

Last active August 14, 2022 14:25
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`ddcutil` Cheat Sheet
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ddcutil_cheat_sheet.md

ddcutil

winddcutil This implements a slightly different API, so the commands are similar to what's below, but not quite the same.

Run everything with sudo.

List displays:

ddcutil detect

Show all VCP feature codes for a display:

# Pipe to less for easier viewing and searching
ddcutil capabilities --display 1 | less

# Or grep what you want
ddcutil capabilities --display 1 | grep -i brightness

Get a VCP value for a display, this will also show value ranges:

ddcutil getvcp 10 --display 1

Set a VCP value:

# 10 is the VCP code, 30 is the value to be set
ddcutil setvcp 10 30 --display 1
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petitJAM commented Jun 15, 2022 •
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At some point it may be worth trying https://frdmtoplay.com/using-ddccontrol-as-a-non-root-user/ to create a ddc group for the i2c monitor devices to run without sudo. (Preferably with Ansible)

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