At Tue, 19 Jun 2007 21:49:01 -0700,Vasilis Manοlopoulos wrote:> > > Thanks for the reply Takashi.> I don't think that this is hardware problem, cause in windows XP, using > the drivers by the manufacturer Hercules, the sound is fine. About the > test you mentioned, I 'll check it when I find free time on weekend and > I 'll let you know the results. I hope you could provide me some further > help then. Unfortunately I am new in linux & sound issues, so creating a > 6 channel wav file and the whole procedure is a bit difficult to me and > it's better to deal with it in the weekend!!
Well, I didn't mean that your hardware is broken. Rather I meant thatit's hardware-specific problem due to the current driverimplementation (three parallel streams without synchronization).
Takashi
> > > > Regards.> > > > O/H Takashi Iwai έγραψε:> > At Sat, 16 Jun 2007 16:56:53 +0300,> > Vasilis Manwlopoulos wrote:> > > >> Hi,> >>> >>> >> Sorry for bothering the list again, but I have major problems with the > >> surround 5.1 sound. I have manually compiled/installed th latest > >> alsa-1.0.14 drivers but nothing improved. I am using Ubuntu 7.04 and my > >> soundcard is the Hercules Fortissimo III. This is, as far as I know by > >> reading on Internet, supported by the module snd-cs46xx in ALSA. I have > >> enabled the surround sound by creating the following .asoundrc file.> >>> >> pcm.!default {> >> type plug> >> slave.pcm "surround51"> >> slave.channels 6> >> route_policy duplicate> >> }> >>> >>> >> The problem is that sound pauses whenever I try to do something "heavy" > >> such as opening a new firefox window or generally another app. Also, > >> there are delays and echo between the front and the rear speakers from > >> time to time. I think that the problem is that, this alsa setup(meaning > >> surround5.1 and the specific soundcard) places a heavy load on the cpu. > >> There are 99% cpu usage times when the only thing active is a player > >> playing a "normal bitrate" mp3. When I delete the .asoundrc file and I > >> switch to default stereo sound using only the 2 front speakers the > >> problems disappear.> >>> >> Can anyone suggest anything about this?> >> > >> > First, try to investigate whether it's a problem of surround51> > implementation or rather the "default" definition above.> > For example, prepare a 6-channel WAV file, and play directly with> > surround51 PCM.> >> > But, from the symptom, I'm afraid it's rather a hardware problem.> > The cs46xx uses three stereo streams for 5.1 output, and they are not> > strictly synchronized. And, debugging cs46xx driver is really a> > nightmare...> >> >> > Takashi> >> > > _______________________________________________Alsa-devel mailing listAlsa-devel@xxxxxxxxxxxxxxxxxxxx://mailman.alsa-project.org/mailman/listinfo/alsa-devel
