[Bug 69693] [BYT]igt/kms_flip causes [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=69693

Jani Nikula <jani.nikula at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #5 from Jani Nikula <jani.nikula at intel.com> ---
The dmesg is filled with:

[  114.978739] [drm:vlv_sideband_rw], IOSF sideband finish wait (read) timed
out
[  114.986739] [drm:vlv_sideband_rw], IOSF sideband idle wait (write) timed out
[  114.994738] [drm:vlv_sideband_rw], IOSF sideband idle wait (read) timed out

which means the DP doesn't have a chance to pass link training, as sideband is
used for setting up the DPLL, port, etc.

Please provide a full dmesg from boot. Use log_buf_size=4M or similar if
necessary to catch everything.

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