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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#c62">Comment # 62</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:g02maran@gmail.com" title="Martin Andersson <g02maran@gmail.com>"> <span class="fn">Martin Andersson</span></a>
</span></b>
<pre>(In reply to <a href="show_bug.cgi?id=69723#c61">comment #61</a>)
<span class="quote">> (In reply to <a href="show_bug.cgi?id=69723#c60">comment #60</a>)
> > 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.
>
> Do you mean while spread spectrum is still enabled?</span >
Yes</pre>
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