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2fe87f54ab
Currently, amdgpu will always set up the brightness at 100% when it loads. However this is jarring when the BIOS has it previously programmed to a much lower value. The ACPI ATIF method includes two members for "ac_level" and "dc_level". These represent the default values that should be used if the system is brought up in AC and DC respectively. Use these values to set up the default brightness when the backlight device is registered. v2: squash in ACPI fix Reviewed-by: Leo Li <sunpeng.li@amd.com> Acked-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Mario Limonciello <mario.limonciello@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.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 reStructuredText 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.