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<b><a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [BYT]igt/many kms_flip subcases randomly fail with *ERROR* failed to train DP, aborting"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73037#c21">Comment # 21</a>
on <a class="bz_bug_link
bz_status_REOPENED "
title="REOPENED --- - [BYT]igt/many kms_flip subcases randomly fail with *ERROR* failed to train DP, aborting"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73037">bug 73037</a>
from <span class="vcard"><a class="email" href="mailto:huax.lu@intel.com" title="lu hua <huax.lu@intel.com>"> <span class="fn">lu hua</span></a>
</span></b>
<pre>Created <span class=""><a href="attachment.cgi?id=101717" name="attach_101717" title="dmesg">attachment 101717</a> <a href="attachment.cgi?id=101717&action=edit" title="dmesg">[details]</a></span>
dmesg
It still happens on latest -nightly kernel.
# ./kms_flip
IGT-Version: 1.7-gfedb9b6 (x86_64) (Linux:
3.16.0-rc2_drm-intel-nightly_891f8a_20140625+ x86_64)
Using monotonic timestamps
Beginning wf_vblank on crtc 6, connector 25
1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
..........................................................................................
wf_vblank on crtc 6, connector 25: PASSED
Beginning wf_vblank on crtc 11, connector 25
1920x1080 60 1920 1966 1996 2080 1080 1082 1086 1112 0xa 0x48 138780
......................................................................^C
# dmesg -r | egrep "<[1-3]>" |grep drm
<3>[ 94.616157] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
<3>[ 95.504899] [drm:intel_dp_complete_link_train] *ERROR* failed to train
DP, aborting
<3>[ 95.507159] [drm:intel_pipe_config_compare] *ERROR* mismatch in
has_dp_encoder (expected 1, found 0)
<3>[ 95.507835] [drm:i9xx_set_fifo_underrun_reporting] *ERROR* pipe B
underrun
<3>[ 95.507839] [drm:valleyview_pipestat_irq_handler] *ERROR* pipe B underrun
<3>[ 107.666500] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
<3>[ 108.789734] [drm:intel_dp_complete_link_train] *ERROR* failed to train
DP, aborting
<3>[ 109.794928] [drm:intel_pipe_config_compare] *ERROR* mismatch in
has_dp_encoder (expected 1, found 0)
<3>[ 109.795557] [drm:valleyview_pipestat_irq_handler] *ERROR* pipe A underrun</pre>
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