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thinkpad-acpi: untangle ACPI/vendor backlight selection

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acpi_video_backlight_support() already tells us if ACPI is handling
backlight control through the generic ACPI handle.  It is better to just
trust it.

While at it, adjust down a printk priority, and test earlier for
brightness_enable=0.

Signed-off-by: Henrique de Moraes Holschuh <[email protected]>
Signed-off-by: Matthew Garrett <[email protected]>
This commit is contained in:
Henrique de Moraes Holschuh 2010-08-09 23:48:19 -03:00 • committed by Matthew Garrett
commit 217f09631a
2 changed files with 24 additions and 22 deletions
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4
Documentation/laptops/thinkpad-acpi.txt
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@ -1024,6 +1024,10 @@ ThinkPad-specific interface. The driver will disable its native
backlight brightness control interface if it detects that the standard
ACPI interface is available in the ThinkPad.
If you want to use the thinkpad-acpi backlight brightness control
instead of the generic ACPI video backlight brightness control for some
reason, you should use the acpi_backlight=vendor kernel parameter.
The brightness_enable module parameter can be used to control whether
the LCD brightness control feature will be enabled when available.
brightness_enable=0 forces it to be disabled. brightness_enable=1