What does the kernel boot parameter "set acpi_osi=Linux" do?

Posted by AIB on Ask Ubuntu See other posts from Ask Ubuntu or by AIB
Published on 2011-03-03T12:07:27Z Indexed on 2011/03/05 15:32 UTC
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Filed under:

10.10

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graphics

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grub

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laptop

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display

I am facing an issue with brightness control in my laptop which has Intel HD graphics. So when I searched for a fix I found that a common suggestion is to edit the GRUB file line,

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"

So could anyone tell me what the kernel boot option acpi_osi=Linux do?

My OS is Ubuntu 10.10 64-bit version

update

The boot parameter acpi_osi is used as follows,

    acpi_osi=       [HW,ACPI] Modify list of supported OS interface strings
                    acpi_osi="string1"      # add string1 -- only one string
                    acpi_osi="!string2"     # remove built-in string2
                    acpi_osi=               # disable all strings

But still I don't find a reason why this should fix any laptop issue!!

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