[LAU] Terratec DMX 6fire 24/96 intermittent static

Tvrtko Ursulin tvrtko at ursulin.net
Sat Jan 14 17:43:57 UTC 2012


On 14/01/12 15:55, Paul Davis wrote:
> On Sat, Jan 14, 2012 at 7:20 AM, Tvrtko Ursulin<tvrtko at ursulin.net>  wrote:
>> It may have been a hardware problem, but not the sound card. I ended up
>> measuring latencies using cyclictest which was giving me shocking  numbers. At
>> the end (cpufreq, rt kernel were in between attempts) it ended with disabling
>> C1E CPU state in the BIOS. For the record it is a Phenom II X2 CPU on a AMD
>> 785G motherboard.
> What BIOS do you have? I'd love to do the same thing here but I'm not
> sure I've seen anywhere in the BIOS to do this.
>
It is a ASUS M4A785TD-M EVO motherboard whose BIOS has C1E 
enable/disable option exposed. It does not feel good to be missing on 
power savings though. When I find some time I plan to dig for a better 
solution.

Tvrtko

P.S. I seems that my yesterday's post with the attached screen shot 
showing the distortion did not make it to the list. I basically played a 
sine wave to pcm0&1 channels and captured channels 11&12 (which is 
digital mixer). With that I proved that the corruption can only be in 
the driver or in the PCM submission hardware (lets call it like that, 
without knowing the ICE1712 architecture). Basically nature of 
distortion is quite weird in that one to two samples every now and then 
get slightly wrong values (not zero or max). This behaviour lasts for a 
random number of seconds and goes away and back similarly.



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