Documentation: explain [KMG] parameter suffix

[mv-sheeva.git] / Documentation / laptops / thinkpad-acpi.txt

diff --git a/Documentation/laptops/thinkpad-acpi.txt b/Documentation/laptops/thinkpad-acpi.txt
index f6f80257addb12a3f498c65f6ae6cfe279439df5..1565eefd6fd52a4c225fd19f4036164b62af2cbc 100644 (file)
--- 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.
 
 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
 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