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FedeDP / Clightd

A linux bus interface that lets you change screen brightness, compute captured webcam frames brightness and change screen temperature.
GNU General Public License v3.0
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Can't set external monitor. #79

Closed MariasStory closed 2 years ago

MariasStory commented 3 years ago

Hi authors, Thank you for the cool solution.

I would like to adjust the backlight for external monitor. But, clightd only detects one device, the notebook monitor:

busctl call org.clightd.clightd /org/clightd/clightd/Backlight org.clightd.clightd.Backlight GetAll "s" ""
===
a(sd) 1 "amdgpu_bl0" 0.0509804

I am using xrandr with --brightness on HDMI-A-0:

xrandr
===
eDP connected 1366x768+244+1080 ...
...
HDMI-A-0 connected primary 1920x1080+0+0 ...
...

How can I set backlight for HDMI-A-0?

FedeDP commented 3 years ago

Hi! Thanks for opening this issue Did you built clightd with ddc support? It requires ddcutil C library installed!

EDIT: have a look at: https://github.com/FedeDP/Clightd/wiki/Build#build-time-switches

MariasStory commented 3 years ago

Hi @FedeDP, I am using: https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=clightd-git

With -DENABLE_DDC=1.

I also installed the gui. There I also find only one device.

Can't I just use xrandr with the brightness parameter set from the camera?

I know that it would not work for wayland and it would be nice to have a universal solution.

FedeDP commented 2 years ago

Can you run sudo ddcutil detect and paste here the output? Thank you!

MariasStory commented 2 years ago

Hi @FedeDP, sorry for the delay:

Invalid display
   I2C bus:  /dev/i2c-5
   EDID synopsis:
      Mfg id:               ORN
      Model:                CLB40B910
      Product code:         0
      Serial number:        
      Binary serial number: 0 (0x00000000)
      Manufacture year:     2014,  Week: 24
   DDC communication failed

Invalid display
   I2C bus:  /dev/i2c-7
   EDID synopsis:
      Mfg id:               BOE
      Model:                
      Product code:         1701
      Serial number:        
      Binary serial number: 0 (0x00000000)
      Manufacture year:     2015,  Week: 1
   DDC communication failed
   This is an eDP laptop display. Laptop displays do not support DDC/CI.
FedeDP commented 2 years ago

Uh :( unfortunately it seems that your monitor does not support DDC/Ci protocol, i am sorry! 😐