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The brightness controls do not have any visible effect on my Toshiba Tecra W50. I tried every combination of acpi_brightness=vendor and acpi_osi=Linux to no avail.

How can I change my screen's brightness?

Notes:

  • I've installed the proprietary Nvidia drivers for my graphics card.
  • The only entry in sys/class/backlight is video0
  • For video0, max_brightness, brightness, and actual_brightness are all 100.

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The buttons set the value in /sys/class/backlight/acpi_video0/brightness, which has no effect. Using xbacklight, however, works well:

xbacklight -set 50

Another way to achieve the same result is to use xrandr:

xrandr --output DP-2 --set Backlight 50

You can then remap the function keys to two scripts containing xbacklight -inc 10 and xbacklight -dec 10. On Mint, you do this by creating a custom keyboard shortcut.

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