1 files changed, 12 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index c86c07459712..dd5013f974d8 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -198,6 +198,18 @@ and is between 256 and 4096 characters. It is defined in the file
                         that require a timer override, but don't have
                         HPET
 
+        acpi_backlight= [HW,ACPI]
+                        acpi_backlight=vendor
+                        acpi_backlight=video
+                        If set to vendor, prefer vendor specific driver
+                        (e.g. thinkpad_acpi, sony_acpi, etc.) instead
+                        of the ACPI video.ko driver.
+
+        acpi_display_output=    [HW,ACPI]
+                        acpi_display_output=vendor
+                        acpi_display_output=video
+                        See above.
+
         acpi.debug_layer=       [HW,ACPI]
                         Format: <int>
                         Each bit of the <int> indicates an ACPI debug layer,