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I am a novice in Ubuntu.

The usual brightness increase/decrease key combination using Fn key doesn't work in Ubuntu 12.04 as many pointed out.

I had found two solutions on this forum to set the screen brightness.

One was to make the usual key combination work answer is given here:

Is there a way to set a hotkey to change screen brightness?

and the other is using the command

sudo setpci -s "00:02.0" F4.B=20

where the 20 is a hexadecimal number representing brightness.

It's only the latter that worked in my case.

I observe that the original brightness setting is restored after resumption from sleep mode.

All I want is to keep my brightness setting permanent. How do I do that?

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Well, it does work - on my laptop (Thinkpad). What laptop are you using? – January Oct 1 '12 at 5:39
I use Acer Aspire One – Aneesh karthik C Oct 1 '12 at 5:41
Alok's suggestion worked for me, but the maximum value looks like 7 for my Sony VAIO. So my values are between 0 and 7. – Rudy Apr 7 at 17:48

3 Answers

up vote 1 down vote

Possibly, the second solution posted in this thread applies to your laptop as well: passing the options acpi_osi=Linux acpi_backlight=vendor to grub. Try to edit the line starting with "GRUB_CMDLINE_LINUX" in the file /etc/default/grub to:

GRUB_CMDLINE_LINUX="quiet splash acpi_osi=Linux acpi_backlight=vendor"

and then run

sudo update-grub

Maybe this will help.

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I found that the commands were executed free of errors, but to no avail :-( I looked up this thread askubuntu.com/questions/56155/… where it asks you to set backlight preferences in the folder /sys/class/backlight I find that this folder is empty. How do I get started adding stuff to this folder, in order to solve my issue? – Aneesh karthik C Oct 1 '12 at 13:15
up vote 0 down vote

If you have Samsung in addition to acpi_backlight=vendor look at https://launchpad.net/~voria/+archive/ppa and install samsung-tools and samsung-backlight.

Also no need to add acpi_osi=Linux.

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up vote 0 down vote

I myself made a geeky solutions for "brightness restoration" problem on my Acer 5755......

paste the following code in text file, make it executable, & add to startup applications....done

pkexec /usr/lib/gnome-settings-daemon/gsd-backlight-helper --set-brightness 800

Your display brightness now set on startup, change "800" as per Your requirement.

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