ACPI: video: Allow selecting NVidia-WMI-EC or Apple GMUX backlight from the cmdline

commit 420a1116aef0e8e12c305508f45ce73e5ae30a09 upstream.

The patches adding NVidia-WMI-EC and Apple GMUX backlight detection
support to acpi_video_get_backlight_type(), forgot to update
acpi_video_parse_cmdline() to allow manually selecting these from
the commandline.

Add support for these to acpi_video_parse_cmdline().

Fixes: fe7aebb40d42 ("ACPI: video: Add Nvidia WMI EC brightness control detection (v3)")
Fixes: 21245df307cb ("ACPI: video: Add Apple GMUX brightness control detection")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 76b7e7f..1db8e68 100644 (file)
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -50,6 +50,10 @@ static void acpi_video_parse_cmdline(void)
                acpi_backlight_cmdline = acpi_backlight_video;
        if (!strcmp("native", acpi_video_backlight_string))
                acpi_backlight_cmdline = acpi_backlight_native;
+       if (!strcmp("nvidia_wmi_ec", acpi_video_backlight_string))
+               acpi_backlight_cmdline = acpi_backlight_nvidia_wmi_ec;
+       if (!strcmp("apple_gmux", acpi_video_backlight_string))
+               acpi_backlight_cmdline = acpi_backlight_apple_gmux;
        if (!strcmp("none", acpi_video_backlight_string))
                acpi_backlight_cmdline = acpi_backlight_none;
 }