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I bought a Sony Vaio with windows 7 preinstalled. Now I have a lot of problem installing Ubuntu, but I was able to install Ubuntu, but now the brightness doesn't work as needed.

With lspci I get:

VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Thames [Radeon 7500M/7600M Series]

How can I solve this ?

Too much light is hurting my eyes, the brightness is at maximum level and I use the computer to work.

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Try installing xbacklight using apt-get (sudo apt-get install xbacklight). Then try this from the terminal, too: xbacklight -20. If brightness is decreased when running this last command, then this solution might work for you: How to use xbacklight with brightness keys in a VAIO (you'll need to edit some of the paths inside the script).

Hope it helps.

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It not work for me! How can I installed drivers to Radeon 7500M ? Thanks in advance – pablo Sep 28 '13 at 10:30
In 12.04 I used "Additional drivers" (run it from the Ubuntu dash) to install the one corresponding to my video card (it's not a Radeon). In later Ubuntu versions, this option has changed place. ---- Sorry for answering late, I didn't get an email notification. – picheto Oct 25 '13 at 22:52

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