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Thread: brightness not getting adjusted by brightness control keys.

  1. #1
    Join Date
    Dec 2012
    Beans
    1

    brightness not getting adjusted by brightness control keys.

    I am using ubuntu 12.04 in my sony vaio VPCEH38FN E series laptop. The brightness is always set to maximum and when i try to adjust it by brightness contol keys ,no effect is there.There is no such problem when i run windows. What to do?

  2. #2
    Join Date
    Jun 2005
    Location
    Toronto, Canada
    Beans
    Hidden!
    Distro
    Xubuntu 14.04 Trusty Tahr

    Re: brightness not getting adjusted by brightness control keys.

    Hello and welcome to the forums.

    What video card do you have and which driver are you using? Can you open a terminal window, run the following commands and post back the results:
    Code:
    sudo lspci -vnn | grep -A12 VGA
    Code:
    cat /proc/cmdline
    Code:
    for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/max_brightness; done
    Code:
    cat /var/log/dmesg | grep -i brightness
    Lets see what you've got.

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