Home / ubuntu / Questions / 741795
In Process
Leonora Tindall
Asked: 2016-03-04 14:08:40 +0800 CST

CF-52 Mk 1 brightness stops at 50%

  • 772

I used the acpi_osi= trick to make Xubuntu 14.04 work with my newly acquired CF-52 Mk 1 Toughbook. Among other things, this enabled it to control the LCD backlight brightness. This mostly works fine, but at 50%, the backlight brightness stops increasing.

These laptops are notorious for failing CCFL backlights. However, I am not experiencing flaring/flashing on startup, dimming over time, or inconsistent brightness. Is it possible that I have either limited the brightness to 50% somewhere without realizing it?

Thanks.

xubuntu

1 Answers

  1. Download xblacklight from Ubuntu software store.

    Xbacklight is used to adjust the backlight brightness where supported. It finds all outputs on the X server supporting backlight brightness control and changes them all in the same way.

       -get   Print out the current backlight brightness of each  output  with
          such a control. The brightness is represented as a percentage of
          the maximum brightness supported.

   -set percent
          Sets each backlight brightness to the specified level.

   -inc percent
          Increases brightness by the specified amount.

   -dec percent
          Decreases brightness by the specified amount.

   -help  Print out a summary of the usage and exit.

   -time milliseconds
          Length of time to spend fading the backlight between old and new
          value.  Default is 200.

   -steps number
          Number of steps to take while fading. Default is 20.
    • 0