Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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.

share|improve this question
up vote 1 down vote accepted

To get working brightness key. try following

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

Change this line


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

share|improve this answer
Web-E i am using windows 7 as i have mentioned in my question please guide me for windows 7.. – Itian Jul 12 '12 at 12:20
This isn't Q&A site for windows. This is for ubuntu only. – Web-E Jul 12 '12 at 15:00

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.