Commit 5aa9d943 authored by Mario Limonciello's avatar Mario Limonciello Committed by Rafael J. Wysocki
Browse files

ACPI: video: Don't enable fallback path for creating ACPI backlight by default 



The ACPI video detection code has a module parameter
`register_backlight_delay` which is currently configured to 8 seconds.
This means that if after 8 seconds of booting no native driver has created
a backlight device then the code will attempt to make an ACPI video
backlight device.

This was intended as a safety mechanism with the backlight overhaul that
occurred in kernel 6.1, but as it doesn't appear necesssary set it to be
disabled by default.

Suggested-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarMario Limonciello <mario.limonciello@amd.com>
Reviewed-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent c573e240

drivers/acpi/acpi_video.c

+1 −5
Original line number Diff line number Diff line
@@ -70,11 +70,7 @@ module_param(device_id_scheme, bool, 0444); 
static int only_lcd = -1;

module_param(only_lcd, int, 0444);



/*

 * Display probing is known to take up to 5 seconds, so delay the fallback

 * backlight registration by 5 seconds + 3 seconds for some extra margin.

 */

static int register_backlight_delay = 8;

static int register_backlight_delay;

module_param(register_backlight_delay, int, 0444);

MODULE_PARM_DESC(register_backlight_delay,

	"Delay in seconds before doing fallback (non GPU driver triggered) "