I cannot reduce the screen brightness on my Acer Aspire 5742

I cannot reduce the screen brightness in Ubuntu 13.04, my device is an Acer Aspire 5742. Ubuntu systems settings says the graphics driver is "Intel® Ironlake Mobile x86/MMX/SSE2" but my laptop comes with "Intel HD Graphics". So I assume it's a problem with my graphic drivers. It would be great if some one could tell me how to uninstall my current driver and install the correct one. Thank you.

2 Answers

Try to press Fn and the right or left arrow keys.

Installing graphics driver for Intel has become so easy.. You can use Intel Linux Graphics Installer to install/update your currentt graphics driver. After installation it will automatically scans your graphics device and install/update as needed.

Follow this instruction to install it:

• Open terminal(CTRL+ALT+T) and execute following command:

  wget --no-check-certificate -O - | \
  sudo apt-key add -

  also

  wget --no-check-certificate -O - | \
  sudo apt-key add -
  sudo apt-get update
  sudo apt-get install intel-linux-graphics-installer

  or download it form here for 32 bit or here for 64bit

• When installed successfully run this command from terminal:

  sudo intel-linux-graphics-installer

  or open from the dash.

• Allow it to scan your graphics driver. Probably it will fix your graphics issue.

To fix your brightness you can try following trick:

Open terminal(CTRL+ALT+T) and execute following command:

 $ sudo cp /etc/default/grub /etc/default/grub_backup $ sudo gedit /etc/default/grub

then change the line GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"

Then save the file and close. Finally execute following commands:

 $ sudo update-grub $ sudo reboot now

Hope after reboot your problem would be solved. Reply for further assistance..

_{Source: 01.org}