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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - i915 external monitor not working in usb-c/thunderbolt dock on X1 gen6"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111250#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - i915 external monitor not working in usb-c/thunderbolt dock on X1 gen6"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111250">bug 111250</a>
from <span class="vcard"><a class="email" href="mailto:stanislav.lisovskiy@intel.com" title="Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>"> <span class="fn">Stanislav Lisovskiy</span></a>
</span></b>
<pre>In dmesg it looks like whenever it tries to detect DP the dpcd read times out:
[ 11.576987] [drm:intel_dp_detect [i915]] [CONNECTOR:92:DP-1]
[ 11.585363] [drm:intel_dp_aux_xfer [i915]] dp_aux_ch timeout status
0x7d4003ff
[ 11.593726] [drm:intel_dp_aux_xfer [i915]] dp_aux_ch timeout status
0x7d4003ff
[ 11.602089] [drm:intel_dp_aux_xfer [i915]] dp_aux_ch timeout status
0x7d4003ff
...
[ 11.819474] [drm:intel_dp_aux_xfer [i915]] dp_aux_ch timeout status
0x7d4003ff
[ 11.827834] [drm:intel_dp_aux_xfer [i915]] dp_aux_ch timeout status
0x7d4003ff
[ 11.836194] [drm:intel_dp_aux_xfer [i915]] dp_aux_ch timeout status
0x7d4003ff
[ 11.844556] [drm:intel_dp_aux_xfer [i915]] dp_aux_ch timeout status
0x7d4003ff
[ 11.844561] [drm:drm_dp_dpcd_access [drm_kms_helper]] Too many retries,
giving up. First error: -110
Can you boot in console mode and check how it works then? (add "3" after
"drm.debug" in the kernel command line).</pre>
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