This is a note to let you know that I've just added the patch titled
ACPI: video: Add acpi_backlight=vendor quirk for Toshiba Portégé R100
to the 6.6-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-add-acpi_backlight-vendor-quirk-for-toshi.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 8492491eefbbdfd070f436f4b91c451a8b2b01a1
Author: Ondrej Zary <linux@xxxxxxx>
Date: Fri Sep 29 22:20:55 2023 +0200
ACPI: video: Add acpi_backlight=vendor quirk for Toshiba Portégé R100
[ Upstream commit 35a341c9b25da6a479bd8013bcb11a680a7233e3 ]
Toshiba Portégé R100 has both acpi_video and toshiba_acpi vendor
backlight driver working. But none of them gets activated as it has
a VGA with no kernel driver (Trident CyberBlade XP4m32).
The DMI strings are very generic ("Portable PC") so add a custom
callback function to check for Trident CyberBlade XP4m32 PCI device
before enabling the vendor backlight driver (better than acpi_video
as it has more brightness steps).
Fixes: 5aa9d943e9b6 ("ACPI: video: Don't enable fallback path for creating ACPI backlight by default")
Signed-off-by: Ondrej Zary <linux@xxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 442396f6ed1f9..31205fee59d4a 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -130,6 +130,16 @@ static int video_detect_force_native(const struct dmi_system_id *d)
return 0;
}
+static int video_detect_portege_r100(const struct dmi_system_id *d)
+{
+ struct pci_dev *dev;
+ /* Search for Trident CyberBlade XP4m32 to confirm Portégé R100 */
+ dev = pci_get_device(PCI_VENDOR_ID_TRIDENT, 0x2100, NULL);
+ if (dev)
+ acpi_backlight_dmi = acpi_backlight_vendor;
+ return 0;
+}
+
static const struct dmi_system_id video_detect_dmi_table[] = {
/*
* Models which should use the vendor backlight interface,
@@ -270,6 +280,22 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
},
},
+ /*
+ * Toshiba Portégé R100 has working both acpi_video and toshiba_acpi
+ * vendor driver. But none of them gets activated as it has a VGA with
+ * no kernel driver (Trident CyberBlade XP4m32).
+ * The DMI strings are generic so check for the VGA chip in callback.
+ */
+ {
+ .callback = video_detect_portege_r100,
+ .matches = {
+ DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
+ DMI_MATCH(DMI_PRODUCT_NAME, "Portable PC"),
+ DMI_MATCH(DMI_PRODUCT_VERSION, "Version 1.0"),
+ DMI_MATCH(DMI_BOARD_NAME, "Portable PC")
+ },
+ },
+
/*
* Models which need acpi_video backlight control where the GPU drivers
* do not call acpi_video_register_backlight() because no internal panel
