This is a note to let you know that I've just added the patch titled
ACPI: video: Force backlight native for some TongFang devices
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
acpi-video-force-backlight-native-for-some-tongfang-.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 93766b6291e89cd3c9cc9616a400cd5d81624df7
Author: Werner Sembach <wse@xxxxxxxxxxxxxxxxxxx>
Date: Thu Jul 7 20:09:52 2022 +0200
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: Werner Sembach <wse@xxxxxxxxxxxxxxxxxxx>
Cc: All applicable <stable@xxxxxxxxxxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 2837b2f98213..22760cc959c4 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -210,7 +210,56 @@ 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"),
+ },
+ },
/*
* These models have a working acpi_video backlight control, and using
* native backlight causes a regression where backlight does not work
