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What do the kernel parameters acpi_osi=linux and acpi_backlight=vendor do?

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I had troubles with the screen brightness control in my laptop and I fixed it by adding the acpi_osi=linux and acpi_backlight=vendorparameters to the filegrub.cfg. I'd like to know what these parameters mean and why they work.

Answers

So... did you try to google that?

The first Google result for "acpi_osi" explains acpi_osi=linux:

[...] BIOS's usually disable functionality if Windows is not detected [...] by default the kernel responds false when asked if Linux is running. acpi_osi=Linux tells the kernel to respond true.(see drivers/acpi/osl.c) It seems that you need to tell the BIOS the truth.

The second Google result for "acpi_osi" explains acpi_backlight=vendor:

acpi_backlight=vendor will prefer vendor specific driver (e.g. thinkpad_acpi, sony_acpi, etc.) instead of the ACPI video.ko driver.

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