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This reverts commitd2a4bb6f8b. So, turns out that this ended up just breaking things. While many laptops incorrectly advertise themselves as supporting PWM backlight controls, they actually will only work with DPCD backlight controls. Unfortunately, it also seems there are a number of systems which advertise DPCD backlight controls in their eDP DPCD but don't actually support them. Talking with some laptop manufacturers has shown it might be possible to probe this support via the EDID (!?!?) but I haven't been able to confirm that this would work on any other manufacturer's systems. So in the mean time, we'll just revert this commit for now and go back to the old way of doing things. Fixes:d2a4bb6f8b("drm/i915: Don't use VBT for detecting DPCD backlight controls") Signed-off-by: Lyude Paul <lyude@redhat.com> Cc: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200204192823.111404-2-lyude@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.