[Bug 89554] [SKL Bisected] eDP can not be lighted up after entering kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89554

--- Comment #20 from Sonika <sonika.jindal at intel.com> ---
Can you please also attach the dmesg with the working panel?
This panel reports HBR2 as the max link rate in DPCD:
[    1.804801] [drm:intel_dp_get_dpcd] DPCD: 12 14 c4 41 00 00 01 c0 02 00 00
00 1f 0b 00

Also, the edp low vswing is selected based on one parameter in vbt
VswingPreEmphasis Value which is a separate field other than the link
parameters where it specifies the vswing and pre-emphasis level.

Following is my bios info from dmesg logs:
Intel Corporation Skylake Client platform/Skylake AIO DDR3L
RVP10, BIOS SKLSE2P1.86C.B060.R01.1411140050

Please note that, the low_vswing_preemph value is set to 1 in my case.
I don't have the vbt for this one to really see the value. But I added some
logs and from there I see that this value is 1 which means default swing
settings (400mv)

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