Ubuntu
acpi package

No screen brightness adujstment on acer aspire 5755-6699

Asked by william.lahann@gmail.com

Lately I've been trying to get the most out of my computer's battery life which is why im bringing this to peoples attention.

Im running 11.10 Ubuntu on my Acer Aspire 5755-6699 laptop and I'm unable to dim the screen brightness.

I'm not sure if it's a hard problem to fix sense I know next to nothing about programming but any help or advice would be great.

I've searched for answers but its hard to even find another person using this laptop online.

Thanks in advance!

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actionparsnip
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Best actionparsnip (andrew-woodhead666) said : 		#1

Run:

gksudo gedit /etc/default/grub

find the line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

and chaneg it to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splashacpi_backlight=vendor acpi_osi=Linux"

Save the new file, close gedit and run:

sudo update-grub

reboot to test.

Source:
http://ubuntuforums.org/showthread.php?t=1742352

Revision history for this message
william.lahann@gmail.com (william-lahann) said : 		#2

Thanks actionparsnip, that solved my question.

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pranava swaroop (dvpswaroop) said : 		#3

i used the same command set, but it is not letting me modify the brightness.

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actionparsnip (andrew-woodhead666) said : 		#4

pravana, thats because its not a one fix for all. This page is for a Mac as that is what the post is focussed on. You dont have a mac so it may nit work. The Ubuntu guides for 5.5 macs advises it to make brightness work on a mac, which you arent using......its really very simple. This is why I said to make your own question so help can be directed at your hardware. I have no idea at all why you are following any of this as your system is completely different. It makes no sense.