| commit | c504f8cb68eb0d6cde53ba043daff8cb34586493 | |
| author | Zhang Rui <rui.zhang@intel.com> | |
| Wed, 30 Dec 2009 07:59:23 +0000 (30 15:59 +0800) | ||
| committer | Len Brown <len.brown@intel.com> | |
| Thu, 31 Dec 2009 01:30:04 +0000 (30 20:30 -0500) | ||
| tree | 2d4500519867b0ff345c3e895d7fdb90739023a7 | treesnapshot (tar.gz zip) |
| parent | 6b7b284958d47b77d06745b36bc7f36dab769d9b | commitdiff |
ACPI video: Prune dupe video devices, unless "video.allow_duplicates"
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>
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>
| drivers/acpi/video.c | diffblobblamehistory |