[Bug 98491] [HSW] i915 only uses 165MHz for HDMI port

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98491

--- Comment #15 from Jani Nikula <jani.nikula at intel.com> ---
The original problem is that we detect your adapter as type 1 DP dual mode
adapter, which are notoriously bad about reporting their max clock. Trying to
read it from the adapter would result in more failures and black screens than
what it would solve. Thus we limit to 165 MHz on type 1 adapters.

Bit 11 of the VBT device class does seem to indicate HDMI rather than DVI
output, but I am really not sure if that can be universally trusted. Something
to think about though.

Have you tried kernel v4.10 or later? It does have some fixes for certain types
of adapters.

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