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Screen brightness on Acer Extensa 2510

Asked by Leonardo Rosi

I've just installed Ubuntu 14.04 on a new Acer Extensa 2510: the screen brightness is blocked on full brightess; no possibility of any adjustment, neither via software nor via hardware.
I've verified this issue is not present under Windows.
Is it possible to submit this problem to Canonical?

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actionparsnip
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actionparsnip (andrew-woodhead666) said : 		#1

Try adding the boot option:

acpi_osi='Linux'

It may help. You can let Canonical know there is an issue by running:

uubuntu-bug acpi

Which will start the ball rolling.

Thanks

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Leonardo Rosi (rosi-leo83) said : 		#2

Do I need to reinstall Ubuntu?
How can I set the boot ooptions?

Thank you in advance

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actionparsnip (andrew-woodhead666) said : 		#3

How would a reinstall fix anything? You would remove the data the put the exact same data in exactly the same place. ....how is this a fix?

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Best actionparsnip (andrew-woodhead666) said : 		#4

If you run :

sudo gedit /etc/default/grub

Change:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

To:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi='Linux'"

Save the new file, close gedit and run:

sudo update-grub

Reboot to test. There are lots of guides online on how to add boot options. I'm guessing you have searched the web and not found any (somehow)....

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Leonardo Rosi (rosi-leo83) said : 		#5

Thanks actionparsnip, that solved my question.

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Leonardo Rosi (rosi-leo83) said : 		#6

My full question was "Do I need to reinstall Ubuntu and use advanced intallation options?"
I looked for answers but not found how to change the boot options; I tried to use boot-repair but I had some doubts about his usefulness.

Concerning about the issue, adjusting brightness by the keyboard is now possible, but not yet by the "brightness & lock" utility in the system settings.

Are there any other solutions to have full brightness support?

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actionparsnip (andrew-woodhead666) said : 		#7

Did you add the boot option, as I gave? Did it work ok?

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actionparsnip (andrew-woodhead666) said : 		#8

Brightness and ACPI depends on the manufaturer. If they use weird solutions, you will get issues and need extra steps to get things nice. If they use standard stuff it will work brilliantly.

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Leonardo Rosi (rosi-leo83) said : 		#9

It works (thank you for all), except for adjustment via system settings ("brightness & lock").
I can adjust brightness with keyboard only, but I'm still happy