[ltp] Cpufreq and ALSA

[Åsmund Grammeltvedt]

On Mon, 26 Apr 2004, T. Ivarsson wrote:

> --------- Original Message ---------
> DATE: Sun, 25 Apr 2004 15:21:24
> From: Åsmund Grammeltvedt <asmundg@stud.cs.uit.no>
> 
> >I seem to have some problems with the sound on my T30 when I change CPU
> >speed. The sound starts to break and tear as the speed changes but clears
> >up when the speeds return to where it was when the playback started.
> >
> >My guess is that it is some kind of timing issue, but I haven't found
> >anything that works and I have gotten it with all the kernels from 2.6.0.  
> >Any ideas?
> 
> It sounds to me as if your CPU freq is so low that it can't process all
> the audio-info in time. There may be two solutions to this:
> 
> 1) Don't reduce the CPU speed so much.
> 2) Increase the audio buffer size
> (can be changed in KDE's Sound System). If you are just listening to
> music, then a high buffer is Ok. If you are playing virtual instruments,
> then you want as low buffer as possible since you want to have a quick
> response (in the music-world called low latency).
> 
> Hope this helps,
> T.

No, I don't think that's it. The frequency only steps between 1300 and 
2000 MHz and the distrortion also occurs if the playback starts at 1300 
and the speed then changes to 2000. I doubt low speed would be the cause 
when the frequency actually increases.

Thanks for the try, anyway.

-- 
Åsmund

http://www.hevtollgrensa.no/