[Bug 105406] No internal display on kernels > 4.4.x

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105406

--- Comment #16 from Jani Nikula <jani.nikula at intel.com> ---
Looks like this was broken for you by

commit 30d9aa4265fe4b2b28239934770b2c2d59858df3
Author: Shubhangi Shrivastava <shubhangi.shrivastava at intel.com>
Date:   Wed Mar 30 18:05:25 2016 +0530

    drm/i915: Read sink_count dpcd always

in v4.7. (Did you ever try v4.5 or v4.6? I suspect those should have worked.)

I have seen very few displays with DPCD rev 1.0 like you have, and it's so old
I've never been able to acquire the 1.0 or even 1.1 specs to see how the sink
count part was written back then.

It seems to me that the current code is okay for DP 1.2 and later. But maybe we
should look assume sink count == 1 for non-branch devices with DPCD 1.0/1.1.

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