Ubuntu – Screen brightness of Dell inspiron N4050 is not changing

atiresolutionscreenwindows 7

I have installed all the drivers of my laptop (Dell inspiron N4050 with windows 7 professional) and now i am trying to minimize the brightness because its too much bright light is itching me.

  1. Neither Fn+f4 key minimizes the brightness nor there is any option of adjustment in Control Panel/Hardware and Sound/Power Options.

  2. Secondly video song become blurry when I switch to full screen and works well without full screen.

Please help me to sort this problem–thanks in advance.

Best Answer

  • To get working brightness key. try following

    press Alt+f2 , execute gksudo gedit /etc/default/grub

    Change this line

    GRUB_CMLINE_LINUX_DEFAULT="quiet splash"

    to something like below

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

    Open a terminal by Alt+ctrl +T, Execute sudo update-grub and reboot . See if brightness keys are working.

    Let us know the result. And for second question it is preferable to open a new question. As the title something different

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