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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2010-08-09 22:48:19 -0400
committerMatthew Garrett <mjg@redhat.com>2010-08-16 11:54:50 -0400
commit217f09631a420295a9688e18aa4dbad1b385e56c (patch)
tree4b3f7890f28abad25c1bf3ff2b4b60499c06765d /Documentation/laptops/thinkpad-acpi.txt
parent122f26726b5e16174bf8a707df14be1d93c49d62 (diff)
thinkpad-acpi: untangle ACPI/vendor backlight selection
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 <hmh@hmh.eng.br> Signed-off-by: Matthew Garrett <mjg@redhat.com>
Diffstat (limited to 'Documentation/laptops/thinkpad-acpi.txt')
-rw-r--r--Documentation/laptops/thinkpad-acpi.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index f6f80257addb..1565eefd6fd5 100644
--- a/Documentation/laptops/thinkpad-acpi.txt
+++ b/Documentation/laptops/thinkpad-acpi.txt
@@ -1024,6 +1024,10 @@ ThinkPad-specific interface. The driver will disable its native
1024backlight brightness control interface if it detects that the standard 1024backlight brightness control interface if it detects that the standard
1025ACPI interface is available in the ThinkPad. 1025ACPI interface is available in the ThinkPad.
1026 1026
1027If you want to use the thinkpad-acpi backlight brightness control
1028instead of the generic ACPI video backlight brightness control for some
1029reason, you should use the acpi_backlight=vendor kernel parameter.
1030
1027The brightness_enable module parameter can be used to control whether 1031The brightness_enable module parameter can be used to control whether
1028the LCD brightness control feature will be enabled when available. 1032the LCD brightness control feature will be enabled when available.
1029brightness_enable=0 forces it to be disabled. brightness_enable=1 1033brightness_enable=0 forces it to be disabled. brightness_enable=1