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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [BSW] System fail to enter S4 at the second cycle to execute "echo disk > /sys/power/state" command"
href="https://bugs.freedesktop.org/show_bug.cgi?id=86697">86697</a>
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<tr>
<th>Summary</th>
<td>[BSW] System fail to enter S4 at the second cycle to execute "echo disk > /sys/power/state" command
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>major
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>wendy.wang@intel.com
</td>
</tr>
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<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>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=109999" name="attach_109999" title="s4-fail-dmesg">attachment 109999</a> <a href="attachment.cgi?id=109999&action=edit" title="s4-fail-dmesg">[details]</a></span>
s4-fail-dmesg
==System Environment==
BSW RVP FAB1 with B1 CPU
BIOS: V41.0
KSC: 1.05
==Failed Kernel==
BSW alpha release kernel: tag: drm-intel-testing 2014-11-21
==Bug detailed description==
-----------------------------
With i915 driver loaded the fail symptom as below:
1. 1st cycle to execute "echo disk > /sys/power/state"
2. test machine will enter S4 successfully, then automatically resume back from
S4.
3. Second time to try executing "echo disk > /sys/power/state", system will
fail to enter into S4
s4-fail-dmesg log file attached.
if disable i915 display with "modprobe.blacklist=i915" parameter, do not have
this S4 issue, which mean second time still can put system into S4, and system
will not automatically wake up.
Attached one good dmesg file for compare: s4-good-dmesg-i915-disable log</pre>
</div>
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