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

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commit 420a1116ae 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: fe7aebb40d ("ACPI: video: Add Nvidia WMI EC brightness control detection (v3)")
Fixes: 21245df307 ("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>
This commit is contained in:
Hans de Goede
2023-01-09 20:18:11 +01:00
committed by Greg Kroah-Hartman
parent 462ed8a2be
commit 1f4a940802
1 changed files with 4 additions and 0 deletions
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4
drivers/acpi/video_detect.c
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@@ -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;
}