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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] Intel HD 520 failed to train DP when connected with a external monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93578#c97">Comment # 97</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL] Intel HD 520 failed to train DP when connected with a external monitor"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93578">bug 93578</a>
from <span class="vcard"><a class="email" href="mailto:elio.martinez.monroy@intel.com" title="Elio <elio.martinez.monroy@intel.com>"> <span class="fn">Elio</span></a>
</span></b>
<pre>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@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.</pre>
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