ACPI: video: Rationalise ACPI backlight implementation

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The sysfs backlight class provides no mechanism for querying the
acceptable brightness for a backlight. The ACPI spec states that values
are only valid if they are reported as available by the firmware. Since
we can't provide that information to userspace, instead collapse the
range to the number of actual values that can be set.

http://bugzilla.kernel.org/show_bug.cgi?id=9277

Signed-off-by: Matthew Garrett <mjg59@srcf.ucam.org>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

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Matthew Garrett 2007-12-26 02:03:26 +00:00 • committed by Len Brown

parent aa62999269

commit 38531e6fe5

1 changed files with 13 additions and 7 deletions

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20

drivers/acpi/video.c

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