Sunday, October 9, 2011

How to Fix Adjust Screen Backlight of HP dv6t Quad Core Edition with ATI/AMD Radeon HD in Ubuntu/Linux Mint 11.04

If you're looking to fix LCD screen backlight adjustment controls in HP dv6t Quad Core Edition notebook with Intel Core i7 2630QM and powered by ATI/AMD Radeon HD 6770M Switchable/Hybrid Graphics Card, here's the tutorial for you.

For a few problems, I have posted solutions on how to run Ubuntu / Linux Mint 11.04 on HP dv6t Quad Core Edition with ATI/AMD Radeon HD 6770M Switchable Graphics Card.
To fix adjusting monitor/screen backlight functionality with Fn/action keys, follow these steps:
1. Add the Kamal PPA repository that contains patched Linux kernel and gnome-power-manager :
sudo add-apt-repository ppa:kamalmostafa/linux-kamal-mjgbacklight
2. Upgrade your packages (especially linux-* and gnome-power-manager packages)
sudo apt-get update
sudo apt-get upgrade
3. Edit the GRUB2 boot parameters in /etc/default/grub to add acpi_vendor=backlight , as follows:
GRUB_CMDLINE_LINUX_DEFAULT="splash acpi_backlight=vendor"
4. Update GRUB configuration:
sudo update-grub
Reboot Ubuntu / Linux and you should have LCD monitor screen backlight adjustment fully working!
I am now very happy with this HP dv6t Quad notebook! Very powerful, good battery life, cool-looking, and runs Linux quite flawlessly :-)
Find tips to optimize your Ubuntu 11.04 in Ubuntu Unleashed 2011 Edition: Covering 10.10 and 11.04 (6th Edition) !


  1. Thx to Kamal for this patched kernel and thx to you about this fast/simple howto. It's works like a charm. HP 630 here.

  2. This worked great for me on 11.04 but the ppa is not for 11.10 nor kernel 3. Any luck with oneiric?

    1. This works flawlessly on ubuntu 11.10 too!!!Tested it myself :)

  3. Worked like a charm

    Debian Wheezy Kernel 3.2 Xen

    I only needed steps 3 and 4 then reboot

  4. Mint Debian works with only steps 3 and 4 then reboot

  5. Thank you! Only steps 3 and 4 almost work for samsung np300a5 with ubuntu 12.04 after installing bumblebee. I say almost because now I could dim the screen but I cannot take the backlight all the way up again. Any idea?

    Much better now anyway.

  6. Update: I am able to increment brithness by this script:

  7. Thank you, this fixed my display brightness issue for my HP DV7T-6000 quad edition, my brightness controls now work properly on ubuntu 13.04 thanks!!