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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [hsw DP] Haswell Iris 5100 DisplayPort stops working when USB device is connected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85670#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [hsw DP] Haswell Iris 5100 DisplayPort stops working when USB device is connected"
href="https://bugs.freedesktop.org/show_bug.cgi?id=85670">bug 85670</a>
from <span class="vcard"><a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> <span class="fn">Jani Nikula</span></a>
</span></b>
<pre>(In reply to Andrzej Pronobis from <a href="show_bug.cgi?id=85670#c0">comment #0</a>)
<span class="quote">> however, if the external monitor is
> configured after the USB device is plugged in, then the following backtrace
> appears in dmesg:
>
> [ 57.685383] ------------[ cut here ]------------
> [ 57.685396] WARNING: CPU: 0 PID: 1879 at
> /build/buildd/linux-3.16.0/drivers/gpu/drm/i915/intel_dp.c:3122
> intel_dp_link_down+0x1a9/0x230 [i915]()
> [ 57.685397] Modules linked in: cdc_ether usbnet r8152 mii pci_stub</span >
...
<span class="quote">> [ 57.688050] [drm:intel_dp_complete_link_train] *ERROR* failed to train
> DP, aborting</span >
Please attach dmesg with drm.debug=14 module parameter set, from boot to this
problem, i.e. plug a problematic USB3 device in first, then the DP cable.</pre>
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