[Bug 103474] Hard lock when unplugging and reconnecting external USB-C DP display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103474

Elizabeth <elizabethx.de.la.torre.mena at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |REOPENED
      i915 platform|                            |KBL
      i915 features|                            |display/atomic
         Whiteboard|                            |ReadyForDev

--- Comment #12 from Elizabeth <elizabethx.de.la.torre.mena at intel.com> ---
There are a lot of "Link Training failed" errors through the dmesg. Sample:
...
[drm:drm_dp_dpcd_access [drm_kms_helper]] Too many retries, giving up. First
error: -110
[drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable link training
[drm:intel_dp_start_link_train [i915]] Link Training failed at link rate =
540000, lane count = 4
[drm:intel_dp_modeset_retry_work_fn [i915]] [CONNECTOR:63:DP-2]

...
[drm:intel_dp_start_link_train [i915]] Channel equalization failed 5 times
[drm:intel_dp_set_idle_link_train [i915]] *ERROR* Timed out waiting for DP idle
patterns
[drm:intel_dp_start_link_train [i915]] Link Training failed at link rate =
540000, lane count = 4
[drm:intel_dp_modeset_retry_work_fn [i915]] [CONNECTOR:63:DP-2]
[drm:intel_dp_check_mst_status [i915]] got esi 41 10 00
[drm:intel_dp_check_mst_status [i915]] got esi2 41 10 00
[drm:intel_dp_check_mst_status [i915]] channel EQ not ok, retraining
[drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting for DDI BUF C idle
bit

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