Hi Alex,
thank you for your response.
On 15.11.2021 10:43, Alex Deucher wrote:
> [...]
>
> That patch adds support for systems with multiple backlights. Do you
> have multiple backlight devices now? If so, does the other one work?
No, there is still only one backlight device -- amdgpu_bl0.
>
> Can you also try this patch?
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> index 4811b0faafd9..67163c9d49e6 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acpi.c
> @@ -854,8 +854,8 @@ int amdgpu_acpi_init(struct amdgpu_device *adev)
> if (amdgpu_device_has_dc_support(adev)) {
> #if defined(CONFIG_DRM_AMD_DC)
> struct amdgpu_display_manager *dm = &adev->dm;
> - if (dm->backlight_dev[0])
> - atif->bd = dm->backlight_dev[0];
> + if (dm->backlight_dev[1])
> + atif->bd = dm->backlight_dev[1];
> #endif
> } else {
> struct drm_encoder *tmp;
>
There is no difference in behaviour after applying the patch.
Samuel
>
> Alex
>
> >
> > Regards,
> > Samuel Čavoj
> >
> > [0]: https://www.reddit.com/r/AMDLaptops/comments/qst0fm/after_updating_to_linux_515_my_brightness/
