tldr/pages/linux/ddcutil.md

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# ddcutil
> Control the settings of connected displays via DDC/CI.
> This command requires the kernel module `i2c-dev` to be loaded. See also: `modprobe`.
> More information: <https://www.ddcutil.com>.
- List all compatible displays:
`ddcutil detect`
- Change the brightness (option 0x10) of display 1 to 50%:
`ddcutil --display {{1}} setvcp {{10}} {{50}}`
- Increase the contrast (option 0x12) of display 1 by 5%:
`ddcutil -d {{1}} setvcp {{12}} {{+}} {{5}}`
- Read the settings of display 1:
`ddcutil -d {{1}} getvcp {{ALL}}`