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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [Power][turbo]GPU peak frequency can't reach peak immediately as exceptedly"
href="https://bugs.freedesktop.org/show_bug.cgi?id=72385">72385</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>[Power][turbo]GPU peak frequency can't reach peak immediately as exceptedly
</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>shengyanx.zhao@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>XOrg CVS
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>Test Env:
------------------------------------
Platform: HSW
Arch: x86
OS: Fedora 19
Xserver: (server-1.14-branch)xorg-server-1.14.4.901
Xf86_video_intel: (master)2.99.906
Kernel: kernel-3.12.2_20131203+-2.x86_64
Reproduced Steps:
------------------------------------
1. rpm -ivh kernel-3.12.2_20131203+-2.x86_64.rpm
2. Start up X.
3. Check the minimum frequency: cat /sys/class/drm/card0/gt_min_freq_mhz
4. Check the maximum frequency：cat /sys/class/drm/card0/gt_max_freq_mhz
5. Check the current frequency: cat /sys/class/drm/card0/gt_cur_freq_mhz
6. Start glxgears && cat /sys/class/drm/card0/gt_cur_freq_mhz
7. Stop glxgears && cat /sys/class/drm/card0/gt_cur_freq_mhz
The expected phenomenon should be: when start glxgears, the current frequency
should be reach to max frequency(e.g. 1100MHz), when stop glxgears, the current
frequency should be fall down to minimum frequency(e.g. 200MHz) quickly.
However, actually, when we start glxgears, we cat
/sys/class/drm/card0/gt_cur_freq_mhz and got frequency remain minimum value,
after 30 mins, the value reach to peak value. At this time, when we kill
glxgears, the peak value fall down a little(e.g. 100HMz, from 1100MHz to
1000MHz) instead of our expected minimum value(e.g. 200MHz).
Reproduced Rate:
------------------------------------
100%</pre>
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