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ACPI video: no warning message if "acpi_backlight=vendor" is used

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AML code always sends notifications to ACPI video device,
even if we disable the ACPI backlight control by using
boot option "acpi_backlight=vendor".

In this case we should not print any warning message.
http://bugzilla.kernel.org/show_bug.cgi?id=13671#c14

Sigend-off-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Zhang Rui 2009-07-13 10:33:24 +08:00 committed by Len Brown
parent 6b7b284958
commit 28c32e99bd
1 changed files with 4 additions and 0 deletions
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4
drivers/acpi/video.c
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@ -1979,6 +1979,10 @@ acpi_video_switch_brightness(struct acpi_video_device *device, int event)
unsigned long long level_current, level_next;
int result = -EINVAL;
/* no warning message if acpi_backlight=vendor is used */
if (!acpi_video_backlight_support())
return 0;
if (!device->brightness)
goto out;