[alsa-devel] Wyse Winterm CS5535 Driver
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 (126.96.36.199 <http://188.8.131.52> ) 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;
>> 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").
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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