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<body><span class="vcard"><a class="email" href="mailto:roberto.derenzi@unipr.it" title="Roberto De Renzi <roberto.derenzi@unipr.it>"> <span class="fn">Roberto De Renzi</span></a>
</span> changed
<a class="bz_bug_link
bz_status_CLOSED bz_closed"
title="CLOSED FIXED - [SKL] failed to train DP when connected with DA200 adapter"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93578">bug 93578</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">i915 features</td>
<td>display/DP
</td>
<td>
</td>
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<b><a class="bz_bug_link
bz_status_CLOSED bz_closed"
title="CLOSED FIXED - [SKL] failed to train DP when connected with DA200 adapter"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93578#c153">Comment # 153</a>
on <a class="bz_bug_link
bz_status_CLOSED bz_closed"
title="CLOSED FIXED - [SKL] failed to train DP when connected with DA200 adapter"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93578">bug 93578</a>
from <span class="vcard"><a class="email" href="mailto:roberto.derenzi@unipr.it" title="Roberto De Renzi <roberto.derenzi@unipr.it>"> <span class="fn">Roberto De Renzi</span></a>
</span></b>
<pre>I have a related but distinct problem with Ubuntu 16.04 on Dell XPS 13 9360,
with BIOS 2.2.1. Similarly to other cases in this closed & fixed thread the
issue is on the USB-C HDMI output, used as an external monitor in dual head
configuration.
However in my case the output does work, but only erratically. When it works,
like now, it is perfect, as per the xrandr output below. But many times it does
not and the monitor enters sleep mode. Sometimes it is sufficient to unplug and
plug in again the HDMI cable, but sometimes neither cable, nor X relaunch,
forcing xrandr by
xrandr --newmode "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083
1088 1120 -hsync +vsync
xrandr --addmode DP-1 "1920x1080_60.00"
xrandr --output DP-1 --mode 1920x1080_60.00
playing with Screen Display or reboot are effective. In a fraction of cases the
monitor turns on spontaneously again after a few hours.
Any suggestion or question welcome! Thanks a lot.
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 8192 x 8192
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y
axis) 294mm x 165mm
1920x1080 59.93*+
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1280x1024 60.02
1440x900 59.89
1280x960 60.00
1360x768 59.80 59.96
1152x864 60.00
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
960x600 60.00
960x540 59.99
800x600 60.00 60.32 56.25
840x525 60.01 59.88
800x512 60.17
700x525 59.98
640x512 60.02
720x450 59.89
640x480 60.00 59.94
680x384 59.80 59.96
576x432 60.06
512x384 60.00
400x300 60.32 56.34
320x240 60.05
DP-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis)
521mm x 293mm
1920x1080 60.00*+ 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 74.98 59.90
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 72.81 66.67 60.00 59.94
720x400 70.08
DP-2 disconnected (normal left inverted right x axis y axis)</pre>
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