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.

The amdgpu_bl0 native GPU backlight class device does actually work,
add a backlight=native DMI quirk for this.

Reported-by: Iris <pawel.js@protonmail.com>
Reviewed-by: Daniel Dadap <ddadap@nvidia.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
- Add a comment that this needs to be revisited when dynamic-mux
  support gets added (suggested by: Daniel Dadap)

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index c02e960..b2a6162 100644 (file)
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -646,6 +646,20 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
        },
 
        /*
+        * 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.
         */