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I have installed Ubuntu 11.10 on my HP dv6 and so far the only problem i've had is that i can't turn down the screen brightness. I use the "hot key" the "short cut keys" I go to settings and make the slider all the way down to dim and screen remains at the brightest me a real bad battery life. Also, I'm accustomed to using low screen settings for reading/writing documents, emails, etc. I've tried using programs such as f.lux and Redshift but these attempts have been without success. I seem to find many others with the same problems. Anyone have any ideas?

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You can add to grub config an acpi command, on the file /etc/default/grub, modify the following lines adding "acpi_backlight=vendor" :

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
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