linux-kernel - [PATCH] ACPI; update docs for "acpi_backlight" kernel parameter options

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Date:   Mon, 30 Mar 2020 17:17:37 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     LKML <linux-kernel@...r.kernel.org>,
        ACPI Devel Mailing List <linux-acpi@...r.kernel.org>
Cc:     Zhang Rui <rui.zhang@...el.com>,
        Hans de Goede <hdegoede@...hat.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>
Subject: [PATCH] ACPI; update docs for "acpi_backlight" kernel parameter
 options

From: Randy Dunlap <rdunlap@...radead.org>

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

Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Cc: linux-acpi@...r.kernel.org
Cc: Zhang Rui <rui.zhang@...el.com>
Cc: Hans de Goede <hdegoede@...hat.com>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Len Brown <lenb@...nel.org>
---
 Documentation/admin-guide/kernel-parameters.txt |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- linux-next-20200330.orig/Documentation/admin-guide/kernel-parameters.txt
+++ linux-next-20200330/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