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I just installed Oneiric on a SAMSUNG NP300V3A (Series 3) laptop. Everything seems to work fine more or less except one thing:

I can't reduce screen brightness more than 10% or so. Fn+F3 (brightness up) sets brightness to 100% and Fn+F2 (brightness down) sets it to about 90% or so. No matter how many more times I press it, it doesn't fall below that. For a video card I have an integrated Intel HD Graphics 3000 chipset, but that's probably unrelated to the issue.

What can I do to solve this?

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I have found a way to fix it! One must edit /etc/default/grub and add "acpi_backlight=vendor" to GRUB_CMDLINE_LINUX_DEFAULT. And then run update-grub. The keys work now! –  Žygis Oct 27 '11 at 16:48
    
Once before, I did the fix mentioned above and run the grub-update but nothing happen. more important, the loading splash screen broken! I just found some infos on the samsung-tool PPA. Is this tool working? Now I'm on the Samsung Netbook NP148, using the key combination of Fn+ up-down cursor key for brightness adjustments –  Aizan Fahri Nov 14 '11 at 17:10
    
Well, mine is a different laptop so I cannot tell what's the solution for you. In my case, samsung-tools didn't help to fix the issue concerning the brightness keys. However, they did add fan speed control functionality and I use them. Your case might be different, but trying it out should be harmless. You can always uninstall it later if it doesn't work. –  Žygis Nov 15 '11 at 1:33
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This question was solved by the OP:

I have found a way to fix it! One must edit /etc/default/grub and add acpi_backlight=vendor to GRUB_CMDLINE_LINUX_DEFAULT.

And then run update-grub. The keys work now!

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