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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 --- - [BYT] RC6 cannot enable using 2014Q1 Release kernel 3.13.6"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76539">76539</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>[BYT] RC6 cannot enable using 2014Q1 Release kernel 3.13.6
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>major
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>wendy.wang@intel.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>All
</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>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=96267" name="attach_96267" title="RC6 issue dmesg file">attachment 96267</a> <a href="attachment.cgi?id=96267&action=edit" title="RC6 issue dmesg file">[details]</a></span>
RC6 issue dmesg file
Boot with 2014Q1 Release kernel version: Linux 3.13.6_20140318+ #1 SMP Tue Mar
18 09:15:05 CST 2014 x86_64 x86_64 x86_64 GNU/Linux
By default setting, cat rc6 debugfs file as below, will see the RC6 us
disabled.
# cd /sys/kernel/debug/dri/0/
# cat i915_drpc_info
RC information accurate: no
Video Turbo Mode: yes
HW control enabled: yes
SW control enabled: no
RC1e Enabled: no
RC6 Enabled: no
Deep RC6 Enabled: no
Deepest RC6 Enabled: no
Current RC state: on
Core Power Down: no
RC6 "Locked to RPn" residency since boot: 32771
RC6 residency since boot: 1419692410
RC6+ residency since boot: 3755604010
RC6++ residency since boot: 0
RC6 voltage: 245mV
RC6+ voltage: 245mV
RC6++ voltage: 245mV
Even insert RC6 enable parameter, and reboot, RC6 still show disabled in
debugfs file.
Change the kernel to 2014_03_14 nightly kernel branch, RC6 is enabled by
default kernel setting.</pre>
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