[Intel-gfx] [PATCH] drm/i915: Use AUX for backlight only if eDP 1.4 or later

[David Weinehall]

On 2017-07-25 02:15, Puthikorn Voravootivat wrote:
> I saw a DP 1.3 panel that advertise AUX backlight brightness control
> but not working properly. So it should work but not in real world.
> I think that is good reason enough to add this as a heuristic.
>
>
Either key it on eDP 1.4 and hope that it's a reasonable expectation,
or employ a whitelist (potentially lots of effort adding all displays that
supports AUX backlight, but safe from regressions) or a blacklist
(potentially fewer displays need to be added, but risks introducing
regressions for end users).


Kind regards, David
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