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joschi
Asked: 2013-01-31 09:28:16 +0800 CST

Maximum brightness is not maximum brightness

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On my dual boot laptop I noticed that maximum brightness in Ubuntu and Windows 8 is totally different. In Windows 8 the screen is much much brighter at maximum level than it is at Ubuntu maximum level. (I was even asked why my laptop display looks that dim.)

I have a Lenovo ThinkPad E330 Laptop with Intel HD 4000 graphics.

How can I increase the maximum brightness level Ubuntu uses?

12.10

4 Answers

  1. did you try xrandr I had the opposite of your problem, my monitor was too bright and adjusted it using xrandr 

    xrandr --output VGA1 --gamma 0.7:0.7:0.7 --brightness 0.8

    you need to replace VGA1 with your current output, and replace 0.8 and 0.7 by 1.5 for example. by default they are all set to 1.

    I hope this helps.

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  2. This worked for me, you could give it a try:

    1. $ sudo gedit /etc/default/grub

    2. Replace this line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" with
      GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

    3. Save and close

    4. $ sudo update-grub

    5. reboot

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  3. Ubuntu has a preset range of values that it can give to any hardware device and assumes that they all use the same brightness values (which they don't) because the BIOS controls for Ubuntu are poorly coded.

    The control is integrated into the window manager and can't be individually configured (same goes for the brightness OSD which can't be disabled without disabling power management altogether).

    I filed a bug for this years ago.

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  4. I also had this problem with my HP 2560p on 16.04. For me it had to do with the light sensor. When I disabled the light sensor in /sys/devices/platform/hp-wmi/als (change 1 to 0) I could increase the brightness higher than before.

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