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

Recently installed Ubuntu 12.04 on my Samsung NP300e5za0pin laptop . Brightness function is not fully functioning, and it will not bring down below 70% when I press the FN++Brighness.

Brightness automatically becomes 100% and then again loss of battery.

Please give some suggestion to solve the problem !!

share|improve this question

I got another samsung laptop. Try to add/change this line in your /etc/default/grub file and run update-grub and restart afterwards. It fixed my problem with the brightness control.

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="

However, battery life is still terrible under Ubuntu .. only 2 hours instead of 4 hours. If anybody has a fix for that, it would be appreciated.

share|improve this answer
If you have optimus graphics, installing bumblebee does wonders for your battery life! See here… for my account. – Charl Botha Oct 13 '12 at 10:41

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.