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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.

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2 Answers 2

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 https://download.01.org/gfx/RPM-GPG-KEY-ilg -O - | \
    
    sudo apt-key add -
    

    also

    wget --no-check-certificate https://download.01.org/gfx/RPM-GPG-KEY-ilg-2 -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

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

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