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So for some reason I could change screen brightness, but only by setting the default in gnome-power-manager. In order to get the function keys to work too I had to play around with HAL config (using an example I found in an ubuntu bug report)
Given that HAL is now deprecated, what is replacing it for handling screen brightness?
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pl give the details of your graphics card. in some cases you need to use setpci command. Most of the Intel integrated graphics work out of box. For latest nvidia cards still some issues to be resolved.
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This was with radeon.
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