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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - GPU lockups with kernel 3.11.0 / 3.12-rc1 when dpm=1 on r600g (Cayman)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=69723#c61">Comment # 61</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW --- - GPU lockups with kernel 3.11.0 / 3.12-rc1 when dpm=1 on r600g (Cayman)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=69723">bug 69723</a>
from <span class="vcard"><a class="email" href="mailto:alexandre.f.demers@gmail.com" title="Alexandre Demers <alexandre.f.demers@gmail.com>"> <span class="fn">Alexandre Demers</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=69723#c60">comment #60</a>)
<span class="quote">> Instead of triggering the power level switches by running GpuTest in bursts,
> I put this in a bash script:
>
> for i in {1..3600}
> do
> echo low > /sys/class/drm/card0/device/power_dpm_force_performance_level
> sleep 1
> echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level
> sleep 5
> done
>
> and just let GpuTest, and piglit, run continously. I found that this also
> trigger the lockups within minutes.
>
> Then I ran the script by itself, no GpuTest or piglit, and left it running
> while I was at work. When I came home the machine was still running, so it
> ran for six hours without any lockup. So it seems the power level switching
> alone is not sufficient to trigger the lockups, it also needs a load of some
> sort.</span >
Do you mean while spread spectrum is still enabled?</pre>
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