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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [HSW] HDMI monitor does not work via active DisplayPort adapter"
href="https://bugs.freedesktop.org/show_bug.cgi?id=83600#c29">Comment # 29</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [HSW] HDMI monitor does not work via active DisplayPort adapter"
href="https://bugs.freedesktop.org/show_bug.cgi?id=83600">bug 83600</a>
from <span class="vcard"><a class="email" href="mailto:chris.cheney@gmail.com" title="Chris Cheney <chris.cheney@gmail.com>"> <span class="fn">Chris Cheney</span></a>
</span></b>
<pre>Looking closely at my dmesg output it appears that when xrandr probes (eg
running vlc) the driver disables the non-existant (on my system) HDMI-A-3 which
is likely using HDMI-D DDC GPIO pins and it ends up disabling my DisplayPort
connector. On my system the DisplayPort connecter in the VBT is EFP3
DisplayPort D using the HDMI-D DDC GPIO Pins.
I'm guessing the fix would involve not exporting non-existant devices from the
kernel/xorg driver?
My system has physically: 2 HDMI and 1 DP.
--
I didn't have the DP plugged in at the moment when this was run:
$ xrandr -q
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected primary 1920x1080+0+0 (normal left inverted right x axis y
axis) 510mm x 290mm
1920x1080 60.00*+ 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1280x1024 60.02
1280x960 60.00
1152x864 59.97
1280x720 60.00 50.00 59.94
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 60.00 59.94
640x480 60.00 59.94
HDMI2 connected 1920x1080+1920+0 (normal left inverted right x axis y axis)
510mm x 290mm
1920x1080 60.00*+ 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1280x1024 60.02
1280x960 60.00
1152x864 59.97
1280x720 60.00 50.00 59.94
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 60.00 59.94
640x480 60.00 59.94
HDMI3 disconnected (normal left inverted right x axis y axis)
VGA1 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)</pre>
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