At Thu, 01 Nov 2007 08:15:57 +1000, Darryl Bond wrote: > > > > Takashi Iwai wrote: > > At Wed, 31 Oct 2007 11:08:06 +1000, > > Darryl Bond wrote: > > > >> I have a Wyse S50 terminal that I am booting diskless. I have been > >> trying to get sound working. The box has a cs5535 chipset. > >> > >> After much fiddling in the kernel source (2.6.22.5 <http://2.6.22.5> ) I > >> have been able to make it work. I'm not sure if it is a cs5535 problem > >> as the code that fixes it is in ac97_pcm.c. > >> > >> It would appear that the card is getting passed an unexpected rate. The > >> function sound/pci/ac97/ac97_pcm.c snd_ac97_set_rate() > >> has a section: > >> case AC97_PCM_FRONT_DAC_RATE: > >> case AC97_PCM_LR_ADC_RATE: > >> > >> if ((ac97->regs[AC97_EXTENDED_STATUS] & AC97_EA_VRA) == 0) /* VRA */ > >> if (rate != 48000 && rate != 96000) > >> return -EINVAL; > >> break; > >> If I use 'aplay wavfile' the rate passed to this function is 44100. > >> I I changethe code to: > >> if (rate != 48000 && rate != 96000 && rate != 44100) > >> > >> it plays but at a slightly incorrect rate. > >> > > > > Apparently your codec doesn't support VRA, so it cannot work except > > for 48kHz (or 96kHz in some cases). Usually other rates are converted > > via alsa-lib plugin. In the recent versions, the default PCM > > "default" does such conversions automagically (unless you specify > > explicitly the non-conversion, e.g., passing the device 'hw"). > > > > > > Takashi > > > The main application I need to run (Citrix ICA client) uses OSS sound. > It works fine with other sound cards and drivers. In this case it passes > 8000 to snd_ac97_set_rate(). OSS emulation also allows the automatic rate conversion, so it should work regardless whether the chip supports non-48kHz or not. > Do I need to make sure that I have a recent Alsalibs? It would appear > that I am using 1.0.10-0. > Does OSS use the alsalibs? Depends. If it's a user-space emulation, then yes. If it's a kerne-space emulation, then no. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
