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I have problems using the brightness control on my acer aspire 3935 (w/ Ubuntu 12.04) - it seems to work for the system (the brightness bar goes up and down), but nothing actually happens (actual brightness don't change). Can you help me? Thanx!

Asked by Alessandro

I have problems using the brightness control on my acer aspire 3935 (w/ Ubuntu 12.04) - it seems to work for the system (the brightness bar goes up and down, both with control keys and with "system control"), but nothing actually happens (actual brightness don't change). Can you help me, please? Thanx!

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Ubuntu acpi Edit question
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N1ck 7h0m4d4k15
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actionparsnip (andrew-woodhead666) said : 		#1

Run:
gksudo gedit /etc/default/grub

Find this line:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

Change it to:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi = Linux"

Save the new file, close gedit and run:
sudo update-grub

Reboot to test. Source:
http://ubuntuforums.org/showthread.php?t=1743301

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Best N1ck 7h0m4d4k15 (nicktux) said : 		#2

Or you can simply run this 2 commands to a terminal

(1) sudo sed 's/GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"/GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="/g' -i /etc/default/grub

(2) sudo update-grub

Reboot your PC

Thanks

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actionparsnip (andrew-woodhead666) said : 		#3

Fancy pants :)

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N1ck 7h0m4d4k15 (nicktux) said : 		#4

On 10/17/2012 04:41 PM, actionparsnip wrote:
> Question #211457 on Ubuntu changed:
> https://answers.launchpad.net/ubuntu/+question/211457
>
> actionparsnip proposed the following answer:
> Fancy pants :)
>
 Hahahahaha

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Alessandro (letterato-alex) said : 		#5

wow! that's a quick answer!
i've tried what you said, and now the problemi is fixed...
thank you guys!
thanks Ubuntu community!

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Alessandro (letterato-alex) said : 		#6

Thanks NikTh, that solved my question.

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wordsmyth2 (wordsmyth2) said : 		#7

I'm having the same problem with my Aspire 3680. Have tried the above suggestions, result negative. Have had no problem with previous Ubuntu distros and am currently using 12.04. When I use the slider on Adjust Brightness, nothing happens: thed isplay remains dim. Any further suggestions,people?