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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 - RX 480 sclk clock speed lowers when under load"
href="https://bugs.freedesktop.org/show_bug.cgi?id=99967">99967</a>
</td>
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<th>Summary</th>
<td>RX 480 sclk clock speed lowers when under load
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
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<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>
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<th>Component</th>
<td>DRM/AMDgpu
</td>
</tr>
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<th>Assignee</th>
<td>dri-devel@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>haagch@frickel.club
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=129917" name="attach_129917" title="screenshot with echo manual > power_dpm_force_performance_level">attachment 129917</a> <a href="attachment.cgi?id=129917&action=edit" title="screenshot with echo manual > power_dpm_force_performance_level">[details]</a></span>
screenshot with echo manual > power_dpm_force_performance_level
My GPU is the factory overclocked XFX Radeon RX 480 XXX OC, this might have
something to do with it.
I noticed this on agd5d/drm-next-4.12-wip and found similar behavior on 4.10,
4.9 and 4.8.
It's even affected even with echo manual >
/sys/class/drm/card0/device/power_dpm_force_performance_level
I've made a screenshot of radeon-profile on linux 4.8.14 and annotated it.
Steps I took:
echo manual > /sys/class/drm/card0/device/power_dpm_force_performance_level
echo 7 > /sys/class/drm/card0/device/pp_dpm_sclk
then started unigine-heaven, closed it, waited a couple of seconds, started
furmark, closed it, waited a couple of seconds and then ran another echo 7 >
/sys/class/drm/card0/device/pp_dpm_sclk
When the GPU is "relatively" idle (just displaying the desktop with a browser,
etc.) this doesn't happen. I can echo any number in
/sys/class/drm/card0/device/pp_dpm_sclk and it sticks.
But when I start applications that put some stress on the GPU, the sclk clock
lowers - and stays on a lower level even when the load is gone, until another
number is echo'ed into /sys/class/drm/card0/device/pp_dpm_sclk</pre>
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