path: root/Documentation
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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2010-08-09 23:48:19 -0300
committerMatthew Garrett <mjg@redhat.com>2010-08-16 11:54:50 -0400
commit217f09631a420295a9688e18aa4dbad1b385e56c (patch)
tree4b3f7890f28abad25c1bf3ff2b4b60499c06765d /Documentation
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')
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
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

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