Cannot adjust brightness
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Hello, I installed Trisquel 11 on an old MacBook Pro, which has an NVIDIA GeForce 9400M graphics processor. I cannot adjust the brightness in any way.find /sys -iname brightness produces the following output:
/sys/devices/platform/applesmc.768/leds/smc::kbd_backlight/brightness
/sys/devices/pci0000:00/0000:00:04.0/usb3/3-6/3-6:1.0/0003:05AC:0237.0004/input/input7/input7::numlock/brightness
/sys/devices/pci0000:00/0000:00:04.0/usb3/3-6/3-6:1.0/0003:05AC:0237.0004/input/input7/input7::capslock/brightness
/sys/devices/pci0000:00/0000:00:04.0/usb3/3-6/3-6:1.0/0003:05AC:0237.0004/input/input7/input7::kana/brightness
/sys/devices/pci0000:00/0000:00:04.0/usb3/3-6/3-6:1.0/0003:05AC:0237.0004/input/input7/input7::compose/brightness
/sys/devices/pci0000:00/0000:00:04.0/usb3/3-6/3-6:1.0/0003:05AC:0237.0004/input/input7/input7::scrolllock/brightness
According to https://trisquel.info/en/forum/how-adjust-brightness-trisquel-mini#comment-98227, I executed echo 100 | sudo tee '/sys/devices/platform/applesmc.768/leds/smc::kbd_backlight/brightness', but it had no effect.
Any ideas anyone?
Have you tried installing and running the program light?
sudo light -S 100
The command above will make it run at full brightness.
Thanks for your reply. I wish to find a solution that would make the laptop's function keys for brightness work. Light appears to be an interesting utility, though its use is presently "heavily discouraged": "WARNING: This project is considered orphaned since the 8th of March, 2023. Use is heavily discouraged until such a time that it is adopted by another developer." (https://github.com/haikarainen/light)
You need make yourself the shortcuts for use it, since Trisquel mini is mini, dont have that features by default as a shortcuts. I recommend you Trisquel (with MATE)
head -n999 '/sys/devices/platform/applesmc.768/leds/smc::kbd_backlight/brightness' returns 254, which is one value below the output of sys/devices/platform/applesmc.768/leds/smc::kbd_backlight/max_brightness As mentioned above, adjusting the brightness value to 100, let's say, has no effect.
Why is that?
By the way, /sys/class/backlight/ is empty.
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