[Bug 87223] [BSW] eDP screen is blank when booting with DP display connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87223

--- Comment #3 from Jeff Zheng <jeff.zheng at intel.com> ---
I tried 10-17 nightly kernel that was tested fine before, but I saw both DP and
eDP screen are blank. So it seems that this issue might be related with BIOS
version. I tried to downgrade the BIOS from 0.49 to 0.40, and found that both
DP and eDP screen shows text for 10-17 nightly kernel. I tried other kernel and
below is the result:
BIOS    10-17 nightly   3.18.0          drm-intel-testing 12-06
0.49    both blank      both blank      eDP shows text, DP blank
0.40    Both show text  both show text  DP shows text, eDP blank

I then run "testdisplay -a" for 3.18.0 + 0.40 BIOS, but DP screen is blank with
two level 3 errors (many entried for each error):
    <3>[  187.580558] [drm:intel_dp_start_link_train] *ERROR* too many full
retries, give up
    <3>[  187.580932] [drm:intel_dp_complete_link_train] *ERROR* failed to
train DP, aborting


Is it a BIOS issue?

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