Reviewed-by: Lyude Paul <lyude@xxxxxxxxxx>
Also, ack on this being pushed to drm-misc, along with any other patches I r-b
On Tue, 2022-05-17 at 17:23 +0200, Hans de Goede wrote:
> Before this commit when we want userspace to use the acpi_video backlight
> device we register both the GPU's native backlight device and acpi_video's
> firmware acpi_video# backlight device. This relies on userspace preferring
> firmware type backlight devices over native ones.
>
> Registering 2 backlight devices for a single display really is
> undesirable, don't register the GPU's native backlight device when
> another backlight device should be used.
>
> Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
> ---
> drivers/gpu/drm/nouveau/nouveau_backlight.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c
> b/drivers/gpu/drm/nouveau/nouveau_backlight.c
> index daf9f87477ba..f56ff797c78c 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
> @@ -34,6 +34,8 @@
> #include <linux/backlight.h>
> #include <linux/idr.h>
>
> +#include <acpi/video.h>
> +
> #include "nouveau_drv.h"
> #include "nouveau_reg.h"
> #include "nouveau_encoder.h"
> @@ -404,6 +406,11 @@ nouveau_backlight_init(struct drm_connector *connector)
> goto fail_alloc;
> }
>
> + if (acpi_video_get_backlight_type(true) != acpi_backlight_native) {
> + NV_INFO(drm, "Skipping nv_backlight registration\n");
> + goto fail_alloc;
> + }
> +
> if (!nouveau_get_backlight_name(backlight_name, bl)) {
> NV_ERROR(drm, "Failed to retrieve a unique name for the
> backlight interface\n");
> goto fail_alloc;
--
Cheers,
Lyude Paul (she/her)
Software Engineer at Red Hat
