ACPI video: Prune dupe video devices, unless "video.allow_duplicates"

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Some buggy BIOS exports multiple ACPI video bus devices for the same
VGA controller, and multiple backlight control methods as well.
This messes up the ACPI video backlight control.

http://bugzilla.kernel.org/show_bug.cgi?id=13577

With this patch applied, only the FIRST ACPI video bus device
under a PCI device node is bind to ACPI video driver by default.

If the first ACPI video bus device doesn't work well, we can use
video.allow_duplicates=1 to go back to the old behavior.

Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

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This commit is contained in:

Zhang Rui 2009-12-30 15:59:23 +08:00 • committed by Len Brown

parent 6b7b284958

commit c504f8cb68

1 changed files with 43 additions and 0 deletions

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drivers/acpi/video.c

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