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I'm running an HP Pavillon DV 9643 EG 17 with OpenSUSE 12.2 and KDE.

I don't know how to adjust the brightness of the screen.

Would looking at /usr/bin/nvidia-settings help?

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You should be able to control it using the KDE brightness settings, just have a look in the Kontrol Center. –  terdon Jan 18 '13 at 16:29

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