Comments (6)
Hummer12007
commented on June 25, 2024
1
https://gitlab.com/ddcci-driver-linux/ddcci-driver-linux is the better way, exposing everything we need via the backlight sysfs interface that brightnessctl uses.
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lamyergeier
commented on June 25, 2024
@Hummer12007 I installed Ubuntu – Details of package ddcci-dkms in focal sudo apt install ddcci-dkms, and restarted. I am trying to set the brightness of my external monitor connected with HDMI cable to 50%
$ xrandr -q | grep " connected"
eDP-1-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
HDMI-1-1 connected primary 1920x1200+1920+0 (normal left inverted right x axis y axis) 519mm x 324mm
$ brightnessctl -d=hdmi* s 50
Device '=hdmi*' not found.
$ brightnessctl -d=HDMI-1-1 s 50
Device '=HDMI-1-1' not found.Any suggestions?
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Hummer12007
commented on June 25, 2024
Check brightnessctl -l output for the correct device name.
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lamyergeier
commented on June 25, 2024
$ brightnessctl -l
Available devices:
Device 'intel_backlight' of class 'backlight':
Current brightness: 4638 (95%)
Max brightness: 4882
Device 'asus-wireless::airplane' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 1
Device 'input3::numlock' of class 'leds':
Current brightness: 1 (100%)
Max brightness: 1
Device 'input28::numlock' of class 'leds':
Current brightness: 1 (100%)
Max brightness: 1
Device 'ath9k-phy0' of class 'leds':
Current brightness: 255 (100%)
Max brightness: 255
Device 'input3::capslock' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 1
Device 'input28::capslock' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 1
Device 'input28::scrolllock' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 1
Device 'input28::kana' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 1
Device 'input3::scrolllock' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 1
Device 'input28::compose' of class 'leds':
Current brightness: 0 (0%)
Max brightness: 1$ brightnessctl -d=intel_backlight s 50%
Device '=intel_backlight' not found.
$ brightnessctl -d=ath9k-phy0 s 50%
Device '=ath9k-phy0' not found.
$ brightnessctl -d='ath9k-phy0' s 50%
Device '=ath9k-phy0' not found.For my laptop screen
$ brightnessctl s 50%
Updated device 'intel_backlight':
Device 'intel_backlight' of class 'backlight':
Current brightness: 2441 (50%)
Max brightness: 4882
$ brightnessctl -d='intel_backlight' s 80%
Device '=intel_backlight' not found.@Hummer12007, we can see that the device name output from -l option doesn't work! Moreover I don't think that it even includes my external monitor connected with HDMI cable!
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Hummer12007
commented on June 25, 2024
It's -d ath9k-phy0 (or --device=ath9k-phy0) instead
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lamyergeier
commented on June 25, 2024
@Hummer12007 This device is for Wireless. As, I said before the external monitor is not even listed in the list of devices!
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