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ACPI: video: Add backlight=native quirk for Dell OptiPlex 5480 AIO

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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: cd8e468efb ("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>
This commit is contained in:
Hans de Goede 2024-09-18 17:38:49 +02:00 committed by Rafael J. Wysocki
parent 9852d85ec9
commit ac78288fe0
1 changed files with 9 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

9
drivers/acpi/video_detect.c
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@ -844,6 +844,15 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
* controller board in their ACPI tables (and may even have one), but * controller board in their ACPI tables (and may even have one), but
* which need native backlight control nevertheless. * 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 */ /* https://bugzilla.redhat.com/show_bug.cgi?id=2303936 */
.callback = video_detect_force_native, .callback = video_detect_force_native,