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On the previous versions the default screen brightness was perfect for me but on 11.10 the default brightness is killing my eye.

I have changed the brightness like this level

enter image description here

but after restarting and every login/logout it returns to default 100%.

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possible duplicate of Desktop doesn't remember brightness settings after a reboot – Jorge Castro Nov 16 '11 at 4:27
@Achu - have you looked at the answers in the duplicate question flagged by Jorge? or have you solved the problem some other way. Can you provide some updated information if not I will flag to close the question as a duplicate. – Mark Rooney Feb 28 '12 at 1:47
up vote 2 down vote accepted

It was a bug on kernel 3.0.0-12-generic and i report it on launchpad

another report i linked to it:

The suggested solution was to upgrade to 3.1. So, I installed kernel 3.1.0-030100-generic and the problem fixed.

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Maybe you can try Ishans Python script:

This stores the current brighness-Information until the next boot.

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From Ubuntu 10.04 to 11.10 I can not change my screen brightness. I use an Acer laptop with VGA Intel HD graphic 3000, and I think this is because my laptop (I tried to update BIOS two or three times so I think that make problems)

I must use xbrightness to fix my problem. You can try to install this package.

It requires some packages like: xutils-dev, libxxf86vm-dev, libxaw7-dev. After installation finish. You can change the brightness by run for example:

$ xbrightness 50000

You can read more on the man page or home site of xbrightness.

You can use this program while waiting for the bug fixed.

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