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Date: Tue, 23 Aug 2022 10:22:51 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Werner Sembach <wse@...edocomputers.com>, Hans de Goede <hdegoede@...hat.com>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com> Subject: [PATCH 4.14 010/229] ACPI: video: Force backlight native for some TongFang devices From: Werner Sembach <wse@...edocomputers.com> 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: Werner Sembach <wse@...edocomputers.com> Cc: All applicable <stable@...r.kernel.org> Reviewed-by: Hans de Goede <hdegoede@...hat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/acpi/video_detect.c | 51 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 50 insertions(+), 1 deletion(-) --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -431,7 +431,56 @@ static const struct dmi_system_id video_ 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.
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