[alsa-devel] Wyse Winterm CS5535 Driver

Darryl Bond dbond at nrggos.com.au
Wed Oct 31 23:15:57 CET 2007

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 ( <> ) 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_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().

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?



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