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setting acpi_backlight=vendor at grub.conf doesn't effect.

asked 2011-10-23 11:09:40 -0500

Lyoko gravatar image

updated 2011-11-25 22:29:04 -0500

mether gravatar image

I'm a former ubuntu user, and i got Asus UL30A laptop.. and I installed Fedora 15, Gnome. setting brightness by Fn keys never worked for me so I have been using official ubuntu guide for my laptop at:

Since there is no update-grub command nor /etc/default/grub.conf file I tried to add manually "acpibacklight=vendor acpiosi=linux" (without these " ") to my grub.conf at /boot/grub/ and it doesn't affect anything.

I have tested setting brightness using terminal and it did work, and i don't want any work arounds.

Thanks everyone!

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answered 2011-10-24 22:02:45 -0500

Where did you add them in grub.conf? they should be on the same line as 'rhgb quiet' are.

Your best bet is to file a bug against the Fedora kernel package and get maintainers to look at it and hopefully fix it for you. See:


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answered 2011-11-10 05:06:40 -0500

place so, acpi_osi=Linux, and use the 'L' uppercase, not lowercase ...

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answered 2011-11-09 13:06:54 -0500

kiilerix gravatar image

This should work out of the box without any boot parameters. Have you tried with Fedora 16?

Anyway: check /proc/cmdline to see if the workaround parameter was handed over to the kernel correctly. That will tell you if the problem is related to grub2 or to the kernel.

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Asked: 2011-10-23 11:09:40 -0500

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Last updated: Nov 10 '11