https://bugs.freedesktop.org/show_bug.cgi?id=73530

--- Comment #80 from N.Leiten <nickleiten@gmail.com> ---
For long time digging radeon drivers I got it working perfectly.

As I mentioned above, the problem is in DP initialization. Somewhere in code
DPCD get NULL'ed and function radeon_dp_get_dp_lane_number in atombios.c
returns 1 lane which is not right (now I hardcoded return 2, cause dpcd[0x002]
is '0').

It seems to be a general problem for FHD panels with DisplayPort and radeon GPU
due to same BUGs commited in bugtracker.

I'll continue digging at this BUG and recheck with SpreadSpectrum enabled.
After that provide patch.

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