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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: 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>
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@ -70,11 +70,7 @@ module_param(device_id_scheme, bool, 0444);
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static int only_lcd = -1;
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module_param(only_lcd, int, 0444);
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/*
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* Display probing is known to take up to 5 seconds, so delay the fallback
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* backlight registration by 5 seconds + 3 seconds for some extra margin.
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*/
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static int register_backlight_delay = 8;
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static int register_backlight_delay;
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module_param(register_backlight_delay, int, 0444);
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MODULE_PARM_DESC(register_backlight_delay,
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"Delay in seconds before doing fallback (non GPU driver triggered) "
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