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<base href="https://bugs.freedesktop.org/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BDW Regression]igt/pm_rpm/debugfs-read causes *ERROR* dpcd read (15 bytes at 0) failed (-110)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90060">90060</a>
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<th>Summary</th>
<td>[BDW Regression]igt/pm_rpm/debugfs-read causes *ERROR* dpcd read (15 bytes at 0) failed (-110)
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>medium
</td>
</tr>
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<th>Component</th>
<td>DRM/Intel
</td>
</tr>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>huax.lu@intel.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=115140" name="attach_115140" title="dmesg">attachment 115140</a> <a href="attachment.cgi?id=115140&action=edit" title="dmesg">[details]</a></span>
dmesg
==System Environment==
--------------------------
Regression: Yes
good commit: 2d1070b21e004609a5bebafdb4303bb021f5477c
bad commit: 097f8261ddda4b1896dd335dec95dedeecfeaa1b
Non-working platforms: BDW
==kernel==
--------------------------
drm-intel-nightly/d600654ab94b325f253e267422dcf60302120ea0
commit d600654ab94b325f253e267422dcf60302120ea0
Author: Daniel Vetter <<a href="mailto:daniel.vetter@ffwll.ch">daniel.vetter@ffwll.ch</a>>
Date: Thu Apr 16 17:54:10 2015 +0200
drm-intel-nightly: 2015y-04m-16d-15h-53m-28s UTC integration manifest
==Bug detailed description==
-----------------------------
It sporadically causes <3>[ 48.390458] [drm:i915_dpcd_show [i915]] *ERROR*
dpcd read (15 bytes at 0) failed (-110).
root@x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# time ./pm_rpm
--run-subtest debugfs-read
IGT-Version: 1.10-gbeddb3b (x86_64) (Linux:
4.0.0_drm-intel-nightly_d60065_20150417+ x86_64)
Runtime PM support: 1
PC8 residency support: 1
Subtest debugfs-read: SUCCESS (34.806s)
real 0m35.166s
user 0m0.026s
sys 0m0.026s
root@x-bdw05:/GFX/Test/Intel_gpu_tools/intel-gpu-tools/tests# dmesg -r | egrep
"<[1-4]>" |grep drm
<3>[ 48.390458] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (15 bytes at 0)
failed (-110)
<3>[ 48.392991] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (2 bytes at
112) failed (-110)
<3>[ 48.395522] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (16 bytes at
128) failed (-110)
<3>[ 48.398053] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (11 bytes at
256) failed (-110)
<3>[ 48.400584] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (8 bytes at
512) failed (-110)
<3>[ 48.403114] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (1 bytes at
1536) failed (-110)
<3>[ 48.405644] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (1 bytes at
1792) failed (-110)
<3>[ 48.408174] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (4 bytes at
1793) failed (-110)
<3>[ 48.410704] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (16 bytes at
1824) failed (-110)
<3>[ 48.413249] [drm:i915_dpcd_show [i915]] *ERROR* dpcd read (2 bytes at
1842) failed (-110)
==Reproduce steps==
----------------------------
1. ./pm_rpm --run-subtest debugfs-read</pre>
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