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| author | Chitransh Mandhaniya <Chitransh_Mandhaniya@dell.com> | 2026-10-10 18:18:30 +0530 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2026-10-12 20:09:13 +0200 |
| commit | 5d76269ee75391812bfdf18df4b2db690d7e264d (patch) | |
| tree | edaae78ee6bb3b1b5cf9ff0f7727ca9c455a028a /drivers | |
| parent | efed63bc78ede446f8bdc3b7b1730882016d332d (diff) | |
| download | linux-next-5d76269ee75391812bfdf18df4b2db690d7e264d.tar.gz linux-next-5d76269ee75391812bfdf18df4b2db690d7e264d.zip | |
ACPI: video: force native backlight on Dell OptiPlex AIO 7410 35W
The Dell OptiPlex AIO 7410 35W (board 01KP8D) declares DELL0501 in its
ACPI DSDT (status = 0x0F) even though no UART scalar board is physically
present. This causes acpi_video_get_backlight_type() to return
acpi_backlight_dell_uart, which makes i915 skip registering
intel_backlight. The dell-uart-backlight driver then times out talking
to the absent board and the probe fails, leaving the machine with zero
backlight control.
A BIOS update fixes this on some models (e.g. OptiPlex 7420, board
0914RT) by setting DELL0501 _STA to 0, but Dell has not shipped a
corrected BIOS for the 7410 even in the latest release (1.37.0,
2026-05-28).
Add a DMI quirk to force native backlight on this model so that i915
registers intel_backlight and brightness control works out of the box.
Tested on:
- OptiPlex AIO 7410 35W (01KP8D, BIOS 1.37.0) -- confirmed
acpi_backlight=native produces working intel_backlight (raw,
max=96000), DMI quirk has the same effect.
- OptiPlex AIO 7420 35W (0914RT, BIOS 1.27.0) -- DELL0501 absent in
updated BIOS, intel_backlight works natively (no regression).
Signed-off-by: Chitransh Mandhaniya <Chitransh_Mandhaniya@dell.com>
Reviewed-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
Link: https://patch.msgid.link/20261010124830.116750-1-chitranshmandhaniya@gmail.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/video_detect.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c index 3037fd18d420..326d4c6d132a 100644 --- a/drivers/acpi/video_detect.c +++ b/drivers/acpi/video_detect.c @@ -883,6 +883,14 @@ static const struct dmi_system_id video_detect_dmi_table[] = { DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 7770 AIO"), }, }, + { + .callback = video_detect_force_native, + /* Dell OptiPlex AIO 7410 35W */ + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex AIO 7410 35W"), + }, + }, /* * Models which have nvidia-ec-wmi support, but should not use it. |