[Bug 111250] i915 external monitor not working in usb-c/thunderbolt dock on X1 gen6

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111250

--- Comment #9 from Stanislav Lisovskiy <stanislav.lisovskiy at intel.com> ---
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).

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