ACPI: video: Docs update for "acpi_backlight" kernel parameter options

Update the Documentation for "acpi_backlight" by adding 2 new
options (native and none).

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 4e3885e..457ca22 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -22,11 +22,13 @@
                        default: 0
 
        acpi_backlight= [HW,ACPI]
-                       acpi_backlight=vendor
-                       acpi_backlight=video
-                       If set to vendor, prefer vendor specific driver
+                       { vendor | video | native | none }
+                       If set to vendor, prefer vendor-specific driver
                        (e.g. thinkpad_acpi, sony_acpi, etc.) instead
                        of the ACPI video.ko driver.
+                       If set to video, use the ACPI video.ko driver.
+                       If set to native, use the device's native backlight mode.
+                       If set to none, disable the ACPI backlight interface.
 
        acpi_force_32bit_fadt_addr
                        force FADT to use 32 bit addresses rather than the