[Bug 111480] i915 monitor connected through dock not working

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111480

Lakshmi <lakshminarayana.vudum at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO
           Severity|normal                      |not set
      i915 platform|                            |CFL
      i915 features|                            |display/HDMI
         Whiteboard|                            |Triaged

--- Comment #4 from Lakshmi <lakshminarayana.vudum at intel.com> ---
>From "dmesg connecting dock with monitor and activating it " I couldn't find
any errors/failures indicating a kernel issue.


>From "dmesg booting connected with dock (beginnig missing)" even though the log
is not from boot I notice that 
24.879406] [drm:intel_dp_start_link_train [i915]] [CONNECTOR:99:DP-2] Link
Training failed at link rate = 540000, lane count = 4

>From "end of dmesg after drm stopped spamming the log " 
[  374.881814] [drm:intel_dp_start_link_train [i915]] *ERROR* Timed out waiting
for DP idle patterns
[  374.881962] [drm:intel_dp_start_link_train [i915]] [CONNECTOR:99:DP-2] Link
Training failed at link rate = 162000, lane count = 2

Can you please verify the issue with drmtip
(https://cgit.freedesktop.org/drm-tip)? Please attach the full dmesg log from
boot if the problem persists with drmtip.

Also when the issue occurred can you attach display info
cat /sys/kernel/debug/dri/0/i915_display_info

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