link-dupont really nailed it! I am having the same issue on an HP
Elitebook 8770w with ONLY an NVIDIA Quadro K3000M, using the proprietary
driver version 387.34 on Fedora 27, Kernel 4.14.3-300
I tried all:
acpi_backlight=video
acpi_backlight=vendor
acpi_backlight=native
to no avail, so removed all of that and installed inotify-tools, I do
have /sys/class/backlight/acpi_video0 so I ended up with the following
script in /home/YOURUSERHERE/Scripts/backlight_inotify.sh
#!/bin/sh
path=/sys/class/backlight/acpi_video0
luminance() {
read -r level < "$path"/actual_brightness
factor=$((100 / max))
printf '%d\n' "$((level * factor))"
}
read -r max < "$path"/max_brightness
nvidia-settings -n -a BacklightBrightness="$(luminance)"
inotifywait -me modify --format '' "$path"/actual_brightness | while read; do
nvidia-settings -n -a BacklightBrightness="$(luminance)"
done
And then created file brightnessfix.desktop under
/home/YOURUSERHERE/.config/autostart
[Desktop Entry]
Name=Brightness Fix
Exec=/home/YOURUSERHERE/Scripts/backlight_inotify.sh
Terminal=false
Type=Application
Name[en_US]=backlightfix.desktop
It is a very effective workaround, thanks.
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https://bugs.launchpad.net/bugs/1518473
Title:
/sys/class/backlight/acpi_video0/brightness is broken
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