(In reply to comment #61)
> (In reply to comment #60)
> > 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?

Yes