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Commit 8ed6e5c5 authored by Werner Sembach's avatar Werner Sembach Committed by Greg Kroah-Hartman
Browse files

ACPI: video: Force backlight native for some TongFang devices 



commit c752089f7cf5b5800c6ace4cdd1a8351ee78a598 upstream.

The TongFang PF5PU1G, PF4NU1F, PF5NU1G, and PF5LUXG/TUXEDO BA15 Gen10,
Pulse 14/15 Gen1, and Pulse 15 Gen2 have the same problem as the Clevo
NL5xRU and NL5xNU/TUXEDO Aura 15 Gen1 and Gen2:
They have a working native and video interface. However the default
detection mechanism first registers the video interface before
unregistering it again and switching to the native interface during boot.
This results in a dangling SBIOS request for backlight change for some
reason, causing the backlight to switch to ~2% once per boot on the first
power cord connect or disconnect event. Setting the native interface
explicitly circumvents this buggy behaviour by avoiding the unregistering
process.

Signed-off-by: default avatarWerner Sembach <wse@tuxedocomputers.com>
Cc: All applicable <stable@vger.kernel.org>
Reviewed-by: default avatarHans de Goede <hdegoede@redhat.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 828f4c31

drivers/acpi/video_detect.c

+50 −1
Original line number Diff line number Diff line
@@ -447,7 +447,56 @@ static const struct dmi_system_id video_detect_dmi_table[] = { 
		DMI_MATCH(DMI_BOARD_NAME, "NL5xNU"),

		},

	},



	/*

	 * The TongFang PF5PU1G, PF4NU1F, PF5NU1G, and PF5LUXG/TUXEDO BA15 Gen10,

	 * Pulse 14/15 Gen1, and Pulse 15 Gen2 have the same problem as the Clevo

	 * NL5xRU and NL5xNU/TUXEDO Aura 15 Gen1 and Gen2. See the description

	 * above.

	 */

	{

	.callback = video_detect_force_native,

	.ident = "TongFang PF5PU1G",

	.matches = {

		DMI_MATCH(DMI_BOARD_NAME, "PF5PU1G"),

		},

	},

	{

	.callback = video_detect_force_native,

	.ident = "TongFang PF4NU1F",

	.matches = {

		DMI_MATCH(DMI_BOARD_NAME, "PF4NU1F"),

		},

	},

	{

	.callback = video_detect_force_native,

	.ident = "TongFang PF4NU1F",

	.matches = {

		DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),

		DMI_MATCH(DMI_BOARD_NAME, "PULSE1401"),

		},

	},

	{

	.callback = video_detect_force_native,

	.ident = "TongFang PF5NU1G",

	.matches = {

		DMI_MATCH(DMI_BOARD_NAME, "PF5NU1G"),

		},

	},

	{

	.callback = video_detect_force_native,

	.ident = "TongFang PF5NU1G",

	.matches = {

		DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),

		DMI_MATCH(DMI_BOARD_NAME, "PULSE1501"),

		},

	},

	{

	.callback = video_detect_force_native,

	.ident = "TongFang PF5LUXG",

	.matches = {

		DMI_MATCH(DMI_BOARD_NAME, "PF5LUXG"),

		},

	},

	/*

	 * Desktops which falsely report a backlight and which our heuristics

	 * for this do not catch.