The only thing I know of that causes artefacts etc. is de DMA error.
Once that occurs the only 'fix' at this moment is to reboot.
Hans
On Sunday 20 August 2006 22:39, Michael Zanetti wrote:
> Hello,
>
> I'm back home now. I just tried disabling CPU Frequency scaling
> again. The machine is running now for about 3 hours. I haven't seen
> any DMA error yet but I can see already artefacts and corrupted mpg
> video. Usually this happens just before the DMA errors come up. Do
> you have this behavior on your setups? Could someone with a working
> setup please attach or upload a kernel config file? I hope I can find
> out some more settings that cause this problem.
>
> Michael
>
> Am 20.08.2006 um 21:39 schrieb John Drescher:
> >> I've finally managed to reproduce the DMA error reliably and
> >> quickly using the following shell script on my dual AMD:
> >>
> >> #!/bin/sh
> >> cd /sys/devices/system/cpu
> >> echo userspace >cpu0/cpufreq/scaling_governor
> >> echo userspace >cpu1/cpufreq/scaling_governor
> >> while true; do \
> >> echo 2200000 >cpu0/cpufreq/scaling_setspeed; \
> >> echo 2200000 >cpu1/cpufreq/scaling_setspeed; \
> >> sleep 0.3; \
> >> echo 1000000 >cpu0/cpufreq/scaling_setspeed; \
> >> echo 1000000 >cpu1/cpufreq/scaling_setspeed; \
> >> sleep 0.3; \
> >> done
> >>
> >> For some reason powernowd triggers the bug only very rarely, but
> >> this shell script is very effective.
> >
> > Thanks for the script. I got "dmabug.sh: line 9:
> > cpu0/cpufreq/scaling_setspeed: Permission denied" errors when I
> > tried that as root so I guess I'll have to dig a little deaper into
> > my kernel config to see why this is happening.
> >
> > John
> >
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