ACK for 6.0; this patch is appropriate for any branch which has the
nvidia-wmi-ec-backlight driver.
On Fri, Nov 18, 2022 at 09:10:58PM -0500, Sasha Levin wrote:
> From: Hans de Goede <hdegoede@xxxxxxxxxx>
>
> [ Upstream commit f46acc1efd4b5846de9fa05f966e504f328f34a6 ]
>
> 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.
>
> The amdgpu_bl0 native GPU backlight class device does actually work,
> add a backlight=native DMI quirk for this.
>
> Reported-by: Iris <pawel.js@xxxxxxxxxxxxxx>
> Reviewed-by: Daniel Dadap <ddadap@xxxxxxxxxx>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> Changes in v2:
> - Add a comment that this needs to be revisited when dynamic-mux
> support gets added (suggested by: Daniel Dadap)
> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
> ---
> drivers/acpi/video_detect.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
> index 68a566f69684..aae9261c424a 100644
> --- a/drivers/acpi/video_detect.c
> +++ b/drivers/acpi/video_detect.c
> @@ -578,6 +578,20 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
> DMI_MATCH(DMI_BOARD_NAME, "GMxRGxx"),
> },
> },
> + /*
> + * Models which have nvidia-ec-wmi support, but should not use it.
> + * Note this indicates a likely firmware bug on these models and should
> + * be revisited if/when Linux gets support for dynamic mux mode.
> + */
> + {
> + .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.
> --
> 2.35.1
>
