[Bug 207086] unable to change LCD brightness on Lenovo Thinkpad Edge E145

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207086

--- Comment #9 from commit-hook at freebsd.org ---
A commit references this bug:

Author: avg
Date: Tue May 26 05:54:00 UTC 2020
New revision: 361495
URL: https://svnweb.freebsd.org/changeset/base/361495

Log:
  MFC r360657: acpi_video: support systems without non-essential methods

  Only _BCL and _BCM methods seem to be essential to the driver's
  operation.  If _BQC is missing then we can assume that the current
  brightness is whatever we set by the last _BCM invocation.  If _DCS or
  _DGS is missing then we can make assumptions as well.

  The change is based on a patch suggested by Anthony Jenkins
  <Scoobi_doo at yahoo.com> in PR 207086.

  PR:           207086

Changes:
_U  stable/12/
  stable/12/sys/dev/acpica/acpi_video.c

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