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| author | Mario Limonciello <mario.limonciello@amd.com> | 2022-12-08 17:42:07 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-12-22 17:26:42 +0100 |
| commit | 5aa9d943e9b6bf6e6023645cbe7ce7d5ed84baf4 (patch) | |
| tree | 435fa82f6b554f9d02570517e6f97ba638b694fc /drivers | |
| parent | drm/amd/display: Report to ACPI video if no panels were found (diff) | |
| download | linux-5aa9d943e9b6bf6e6023645cbe7ce7d5ed84baf4.tar.xz linux-5aa9d943e9b6bf6e6023645cbe7ce7d5ed84baf4.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/acpi_video.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/drivers/acpi/acpi_video.c b/drivers/acpi/acpi_video.c index 75dc37affff2..97b711e57bff 100644 --- a/drivers/acpi/acpi_video.c +++ b/drivers/acpi/acpi_video.c @@ -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) " |