Cannot adjust Brightness on Lenovo G560 core i5 using Fn+Up & Fn+Dn keys

Asked by Yahya Al-Hajj

Lenovo G560 core i5 450M, with Mobile Intel Graphics Media Accelerator 4500MHD Notebook + Ubuntu 10.04.

Unable to adjust the screen brightness using Fn+Up & Fn+Dn but it works when I want to adjust the sound or when I want to suspend the notebook.

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Ubuntu Edit question
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