I run Linux, Debian/Testing to be exact, and recently installed DDCCI DKMS supprt, and ddcutil. I’m using a KDE Plasma (v5 for now is what’s in the Debian/Testing repos) and using a DDC/CI widget, I can detect the external monitor, but it doesn’t see the internal display.
Using ddcutil detect, it seems the internal display, but says it can’t do anything with it. Why is this? Can there be a firmware change to support standard DDC/CI functionality?
$ ddcutil detect
Invalid display
I2C bus: /dev/i2c-14
DRM connector: card0-eDP-1
EDID synopsis:
Mfg id: BOE - BOE
Model:
Product code: 3017 (0x0bc9)
Serial number:
Binary serial number: 0 (0x00000000)
Manufacture year: 2022, Week: 48
This is a laptop display. Laptop displays do not support DDC/CI
Display 1
I2C bus: /dev/i2c-18
DRM connector: card0-DP-4
EDID synopsis:
Mfg id: DEL - Dell Inc.
Model: DELL S2722QC
Product code: 41422 (0xa1ce)
Serial number: 4D2XLD3
Binary serial number: 810961996 (0x30564c4c)
Manufacture year: 2022, Week: 28
VCP version: 2.1