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

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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: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mario Limonciello 2022-12-08 10:42:07 -06:00 committed by Rafael J. Wysocki
parent c573e24060
commit 5aa9d943e9
1 changed files with 1 additions and 5 deletions
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6
drivers/acpi/acpi_video.c
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@ -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) "