[Bug 81762] Backlight keys on ASUS UX301

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81762

--- Comment #5 from Josh Boyer <jwboyer at fedoraproject.org> ---
Yes, when I looked at it I came to a similar conclusion.  From my
understanding, what would need to be done is essentially having i915 keep a
mapping of it's connectors to the ACPI device id's that are returned via the
_ADR method.  The only way I know how to do that is to decode them according to
the opregion spec, but it does seem to be possible.  Once that mapping is
created, i915 could set CADL whenever the display switches to a new connector.

The shortcut is to just quirk this somehow, but that doesn't sound like a good
overall solution.

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