f470cbb2d6
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 the we can make assumptions as well. The change is based on a patch suggested by Anthony Jenkins <Scoobi_doo@yahoo.com> in PR 207086. PR: 207086 Submitted by: Anthony Jenkins <Scoobi_doo@yahoo.com (earlier version) Reviewed by: manu MFC after: 3 weeks Differential Revision: https://reviews.freebsd.org/D24653
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