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

[bugzilla-daemon at freedesktop.org]

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

Ville Syrjala <ville.syrjala at linux.intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |NEEDINFO

--- Comment #10 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
[   14.988821] [drm:intel_dp_read_dpcd [i915]] DPCD: 10 0a 82 40 00 00 01 00 02
00 00 00 10 01 00

means we were able to read the DPCD, and it has a valid revision number.

That leads me to suspect that the display might be saying that SINK_COUNT is
zero.

Please run this:
dd if=/dev/drm_dp_aux1 bs=1 skip=$((0x200)) count=1 2>/dev/null | xxd -p

Your kernel will need to be built with CONFIG_DRM_DP_AUX_CHARDEV=y for that to
work.

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