[Bug 93578] [SKL] Intel HD 520 failed to train DP when connected with a external monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93578

--- Comment #97 from Elio <elio.martinez.monroy at intel.com> ---
This topic is really interesting, i was trying to reproduce the issue with a
SKL NuC6i7KYK , having the following messages everytime that i connect the
USB-C dongle:

(03:09 PM) [gfx at gfx-desktop] [~]$ : dmesg | grep xhci_hcd
[  491.597534] xhci_hcd 0000:3c:00.0: remove, state 1
[  491.598091] xhci_hcd 0000:3c:00.0: Host halt failed, -19
[  491.598093] xhci_hcd 0000:3c:00.0: Host not accessible, reset failed.
[  491.598094] xhci_hcd 0000:3c:00.0: USB bus 4 deregistered
[  491.598102] xhci_hcd 0000:3c:00.0: remove, state 4
[  491.598289] xhci_hcd 0000:3c:00.0: USB bus 3 deregistered
[  501.850414] xhci_hcd 0000:3c:00.0: xHCI Host Controller
[  501.850418] xhci_hcd 0000:3c:00.0: new USB bus registered, assigned bus
number 3
[  501.851552] xhci_hcd 0000:3c:00.0: hcc params 0x200077c1 hci version 0x110
quirks 0x00009810
[  501.852021] xhci_hcd 0000:3c:00.0: xHCI Host Controller
[  501.852024] xhci_hcd 0000:3c:00.0: new USB bus registered, assigned bus
number 4
[  502.180089] usb 4-1: new SuperSpeed USB device number 2 using xhci_hcd


Having the following output in xrandr
: xrandr
Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 8192 x 8192
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-3 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis)
621mm x 341mm
   3840x2160     30.00*
   2560x1600     59.97
   2560x1440     59.95
   1920x1080     60.00    60.00    50.00    59.94
   1920x1080i    60.00    50.00    59.94
   1680x1050     59.88
   1280x1024     75.02    60.02
   1440x900      59.90
   1280x960      60.00
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1440x576      50.00
   1024x768      75.03    70.07    60.00
   1440x480      60.00    59.94
   832x624       74.55
   800x600       72.19    75.00    60.32    56.25
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    72.81    66.67    60.00    59.94
   720x400       70.08
HDMI-2 disconnected (normal left inverted right x axis y axis)
  848x480 (0x104) 33.750MHz +HSync +VSync
        h: width   848 start  864 end  976 total 1088 skew    0 clock  31.02KHz
        v: height  480 start  486 end  494 total  517           clock  60.00Hz

Kernel Version: 4.10.

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