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| author | Hans de Goede <hdegoede@redhat.com> | 2024-09-18 17:38:49 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-10-10 12:01:03 +0200 |
| commit | 1589c411681073eb382e161267b3af2c649784d2 (patch) | |
| tree | ed67cc8a8ab27fce8791481c0c82000ab0a313c9 /drivers | |
| parent | e4a28489b310339b2b8187bec0a437709be551c1 (diff) | |
| download | linux-1589c411681073eb382e161267b3af2c649784d2.tar.gz linux-1589c411681073eb382e161267b3af2c649784d2.tar.bz2 linux-1589c411681073eb382e161267b3af2c649784d2.zip | |
ACPI: video: Add backlight=native quirk for Dell OptiPlex 5480 AIO
commit ac78288fe062b64e45a479eaae74aaaafcc8ecdd upstream.
Dell All In One (AIO) models released after 2017 may use a backlight
controller board connected to an UART.
In DSDT this uart port will be defined as:
Name (_HID, "DELL0501")
Name (_CID, EisaId ("PNP0501")
The Dell OptiPlex 5480 AIO has an ACPI device for one of its UARTs with
the above _HID + _CID. Loading the dell-uart-backlight driver fails with
the following errors:
[ 18.261353] dell_uart_backlight serial0-0: Timed out waiting for response.
[ 18.261356] dell_uart_backlight serial0-0: error -ETIMEDOUT: getting firmware version
[ 18.261359] dell_uart_backlight serial0-0: probe with driver dell_uart_backlight failed with error -110
Indicating that there is no backlight controller board attached to
the UART, while the GPU's native backlight control method does work.
Add a quirk to use the GPU's native backlight control method on this model.
Fixes: cd8e468efb4f ("ACPI: video: Add Dell UART backlight controller detection")
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patch.msgid.link/20240918153849.37221-1-hdegoede@redhat.com
[ rjw: Changelog edit ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/video_detect.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c index 428a7399fe04..b05064578293 100644 --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -845,6 +845,15 @@ static const struct dmi_system_id video_detect_dmi_table[] = { * which need native backlight control nevertheless. */ { + /* https://github.com/zabbly/linux/issues/26 */ + .callback = video_detect_force_native, + /* Dell OptiPlex 5480 AIO */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 5480 AIO"), + }, + }, + { /* https://bugzilla.redhat.com/show_bug.cgi?id=2303936 */ .callback = video_detect_force_native, /* Dell OptiPlex 7760 AIO */ |