As many other Ubuntu users several days ago I’ve upgraded my Feisty to Gutsy at my Dell Inspiron 1501.
Unfortunately many things that worked for me in Feisty doesn’t work in Gutsy just after upgrading. Among them are: suspend/hibernate and brightness adjustment. At this moment I’m trying to get these features working and certainly share results here but not workable brightness adjustment really disturbed me. So, until I didn’t find a solution how to adjust LCD brightness with keyboard, there is nice workaround: execute the following command with root rights (sudo -s to get it):
echo -n 100 > /proc/acpi/video/VGA/LCD/brightness
This will make you LCD screen as bright as possible and you can proceed with your work (like me 
). To lower brightness just replace 100 with another value like 62 and watch the results.
Hope it helps!
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I have GFX0 instead of VGA on Karmic and I get the Invalid Argument error too.
/proc/acpi/video/GFX0/LCD# echo -n 100 > brightness
bash: echo: write error: Invalid argument
/proc/acpi/video/GFX0/LCD# cat brightness
/proc/acpi/video/GFX0/LCD#
Sorry, the forum ate my <> signs
/proc/acpi/video/GFX0/LCD# cat brightness
<not supported>
/proc/acpi/video/GFX0/LCD#
??? ???????? ???????????????, ?? ??? ??????? ??? ?? ???????????? ????? ???????? ?????? ????? ?????-?? ?????.
for all of you, who have the "invalid argument" problem. And who can't change the brightnes value, because you are unable to edit the brightness file.
Install xbacklight (eg. sudo apt-get install xbacklight) and use it to change the brightness value eg.
xbacklight -set 100
Just change the 100 to anything you want between 0-100
In my machine the numbers are not in logical order, but once you know how bright each seting is you can "remember those numbers", or write a script
And xbacklight does change the brightness value too...
i installed xbacklight and typed in "xbacklight -set 100"
then it says "No outputs have backlight property"
what's the problem..??
Hi Guys,
Okay - those guys having problems... Type in:
cat /procacpi/video/VGA/LCD/brightness
In that above line, LCD may be something different - mines LLCD. Anyway, there's the possibility that yours isn't on a scale from 0 to 100. Mine goes from 0 to 15. So if you're looking at your monitor and it's already pretty bright, and you've run that command above, that's probably going to be your maximum value.
So go to the original command, and alter your values to match.
Regards,
Nevyn.
i keep getting "bash: /proc/acpi/video/GLX0/LCD/brightness: No such file or directory"
but it is there, i checked by browsing the file system, but the file is read-only
anything i can do?
One note: If you don't have /proc/acpi/video, do this:
sudo modprobe video
Now you have. :)
Hi,
I am also getting “No outputs have backlight property”.
After installing back light. What should i do??
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hey i am sing ubuntu 10.04 version. my system brightness is not changing with Fn key.
/proc/acpi/video/VGA/LCD/brightness is not there. there is /proc/acpi/video/GFX0/DD01/brightness file. but when i followed with echo -n /proc/acpi/video/GFX0/DD01/brightness it is saying that echo is invalid arguement... please help me .. i am facing problem to my eyes with high brightness.
If you use gnome, you could just add Brightness Applet to you Panel
Thanks - it works!
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hi i tried it but it did not work and it says root@me~#
Check my tool for the brightness adjustment.
https://github.com/akozadaev/xbright
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It worked for my HP Pavilion tx 1000 / 1215 laptop.Thanks buddy.
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