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ACPI: video: Add backlight=native quirk for Dell OptiPlex 7760 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 7760 AIO has an ACPI device for one if its UARTs with
the above _HID + _CID. Loading the dell-uart-backlight driver shows that
there actually is a backlight controller board attached to the UART,
which reports a firmware version of "G&MX01-V15".

But the backlight controller board does not actually control the backlight
brightness and 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: 484bae9e4d ("platform/x86: Add new Dell UART backlight driver")
Closes: https://bugzilla.redhat.com/show_bug.cgi?id=2303936
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://patch.msgid.link/20240814190159.15650-4-hdegoede@redhat.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Hans de Goede 2024-08-14 21:01:59 +02:00 committed by Rafael J. Wysocki
parent b5f0943001
commit 5c7bb62cb8
1 changed files with 15 additions and 0 deletions
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15
drivers/acpi/video_detect.c
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@ -823,6 +823,21 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
},
},
/*
* Dell AIO (All in Ones) which advertise an UART attached backlight
* controller board in their ACPI tables (and may even have one), but
* which need native backlight control nevertheless.
*/
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=2303936 */
.callback = video_detect_force_native,
/* Dell OptiPlex 7760 AIO */
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "OptiPlex 7760 AIO"),
},
},
/*
* Models which have nvidia-ec-wmi support, but should not use it.
* Note this indicates a likely firmware bug on these models and should