[Public]
> -----Original Message-----
> From: Hans de Goede <hdegoede@xxxxxxxxxx>
> Sent: Monday, October 31, 2022 16:26
> To: Rafael J . Wysocki <rafael@xxxxxxxxxx>
> Cc: Hans de Goede <hdegoede@xxxxxxxxxx>; Len Brown
> <lenb@xxxxxxxxxx>; linux-acpi@xxxxxxxxxxxxxxx; platform-driver-
> x86@xxxxxxxxxxxxxxx; Daniel Dadap <ddadap@xxxxxxxxxx>
> Subject: [PATCH] ACPI: video: Add backlight=native DMI quirk for Dell G15
> 5515
>
> The Dell G15 5515 has the WMI interface (and WMI call returns) expected
> by the nvidia-wmi-ec-backlight interface. But the backlight class device
> registered by the nvidia-wmi-ec-backlight driver does not actually work.
>
Is there a way to detect this from nvidia-wmi-ec-backlight? I would think it's
cleaner to have that driver return -ENODEV so you end up with just the "working"
amdgpu_bl0.
> The amdgpu_bl0 native GPU backlight class device does actually work,
> add a backlight=native DMI quirk for this.
>
> Cc: Daniel Dadap <ddadap@xxxxxxxxxx>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> drivers/acpi/video_detect.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
> index 841f6213b4de..88acc09773bb 100644
> --- a/drivers/acpi/video_detect.c
> +++ b/drivers/acpi/video_detect.c
> @@ -645,6 +645,16 @@ static const struct dmi_system_id
> video_detect_dmi_table[] = {
> },
> },
>
> + /* Models which have nvidia-ec-wmi support, but should not use it.
> */
> + {
> + .callback = video_detect_force_native,
> + /* Dell G15 5515 */
> + .matches = {
> + DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
> + DMI_MATCH(DMI_PRODUCT_NAME, "Dell G15 5515"),
> + },
> + },
> +
> /*
> * Desktops which falsely report a backlight and which our heuristics
> * for this do not catch.
> --
> 2.37.3
