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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 --- - [HSW] FBC didn’t save power for game workload"
href="https://bugs.freedesktop.org/show_bug.cgi?id=65694">65694</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>lianyuex.yang@intel.com, ouping.zhang@intel.com
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[HSW] FBC didn’t save power for game workload
</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>tienan.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>
<p>
<div>
<pre>System Environment:
----------------------------------------
Platform: HSW
Libdrm: (master)libdrm-2.4.45-3-
g3586337f3703ce4833a375f66b08df064a1cec28
Mesa: (master)f6beb4c6b647b0d5077c7abd6c99cdaba6e0c112
Xserver: (master)xorg-server-1.14.99.1-82-
g7e97166c4fc38076b6224e4dbdd632b43444149f
Xf86_video_intel:
(master)2.21.6-47-gd6c30d1d4df6bcdfa075bd29da7c8aabee20774c
Cairo: (master)631bf299256e11a17511977f357e0353fb5615f7
Libva:
(staging)880c916092c6d68096c95e49405714d8a21f9322
Libva_intel_driver: (staging)0a5cfdab47c788569feb0a3e4293906687523f88
Kernel: (drm-intel-nightly)
675fa342aa3a54af0a81f23809fff9590dfb6fc1
Test result:
----------------------------------------
HSW-ult FBC disable Average_watt FBC enable Average_watt
game 21 21
IVB FBC disable Average_watt FBC enable Average_watt
game 34.8 34.7
Findings:
----------------------------------------
For game, FBC saved 0.1w on IVB, but didn’t saved power on HSW.
FBC pass/fail criteria is 0.1-0.2w.</pre>
</div>
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