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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [BDW Regression ]HDMI hot plug case ERROR."
href="https://bugs.freedesktop.org/show_bug.cgi?id=82611">82611</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[BDW Regression ]HDMI hot plug case ERROR.
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Reporter</th>
<td>lei.a.liu@intel.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=104611" name="attach_104611" title="dmesg">attachment 104611</a> <a href="attachment.cgi?id=104611&action=edit" title="dmesg">[details]</a></span>
dmesg
==System Environment==
--------------------------
Regression: Yes. Before this issue , HDMI hot plug cause system hang.
==kernel==
--------------------------
-nightly: 723dbbfb6ce02b5662c0c4cac9be3bcdfbb11d35 (failed)
drm-intel-nightly: 2014y-08m-12d-19h-37m-18s integration manifest
-queued: c0ee2e894256703265604a7455d614409c010ce8 (failed)
drm/i915: Unify ivb_update_cursor() and i9xx_update_cursor()
-fixes: be71eabebaf9f142612d34d42292b454e984dcb5 (failed)
Revert "drm/i915: Enable semaphores on BDW"
==Bug detailed description==
-----------------------------
<a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED --- - [HSW/BYT/BDW Bisected]HDMI hot plug cause system hang"
href="show_bug.cgi?id=81856">bug 81856</a> block my bisect.
When I unplug or plug in HDMI monitor, ERROR message will be outputted like
below:
[ 305.444350] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
[ 305.446126] [drm:intel_dp_set_signal_levels] Using signal levels 00000000
[ 305.453020] [drm:drm_dp_dpcd_access] too many retries, giving up
[ 305.453021] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
[ 305.454789] [drm:intel_dp_set_signal_levels] Using signal levels 00000000
[ 305.461683] [drm:drm_dp_dpcd_access] too many retries, giving up
[ 305.461685] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
[ 305.463463] [drm:intel_dp_set_signal_levels] Using signal levels 00000000
[ 305.470267] [drm:drm_dp_dpcd_access] too many retries, giving up
[ 305.470269] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
[ 305.473171] [drm:intel_dp_set_signal_levels] Using signal levels 00000000
[ 305.479570] [drm:intel_dp_set_signal_levels] Using signal levels 01000000
[ 305.486403] [drm:drm_dp_dpcd_access] too many retries, giving up
[ 305.486405] [drm:intel_dp_start_link_train] *ERROR* failed to update link
training
[ 305.489126] [drm:intel_dp_set_signal_levels] Using signal levels 01000000
[ 305.495960] [drm:drm_dp_dpcd_access] too many retries, giving up
[ 305.495962] [drm:intel_dp_complete_link_train] *ERROR* failed to update link
training
[ 305.497507] [drm:drm_dp_mst_allocate_vcpi] initing vcpi for 619 16
[ 305.518263] [drm:intel_mst_enable_dp] 1
==Reproduce steps==
----------------------------
1. unplug HDMI monitor
2. plug HDMI monitor</pre>
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