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da11ef8329
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. Changes in v2: - To avoid linker errors when amdgpu is builtin and video_detect.c is in a module, select ACPI_VIDEO and its deps if ACPI is enabled. When ACPI is disabled, ACPI_VIDEO is also always disabled, ensuring the stubs from acpi/video.h will be used. Changes in v3: - Use drm_info(drm_dev, "...") to log messages - ACPI_VIDEO can now be enabled on non X86 too, adjust the Kconfig changes to match this. Acked-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.