Re: [Alsa-user] Audio-gd NFB-17.32 (VIA VT1731)

[Davor H. <dav...@gu...>]

On 03/24/2013 11:03 PM, Torstein Hegge wrote:
> On Sun, Mar 24, 2013 at 22:41:11 +0100, Davor Herga wrote:
>> On 03/24/2013 09:53 PM, Torstein Hegge wrote:
>>> On Sun, Mar 24, 2013 at 00:15:04 +0100, Davor Herga wrote:
>>>> I tried the Openwrt-box with 3.6.11 kernel which already uses the patch
>>>> and I did not have any problems changing sample rates.
>>>> I had two tracks, one 44.1kHz and one 96kHz. No matter which was started
>>>> first, there were no problems noticed.
>>>>
>>>> On the laptop I used the Slax distro with 3.8.2 kernel, which I believe
>>>> does not use the patch, because it is not present in 3.8.3 kernel.
>>>> If I started to play the file with 96kHz track, the sampling rate
>>>> frequency (checked in cat /proc/asound/card2) was set wrong, but if the
>>>> track was stopped and restarted the sampling frequency was correct. When
>>>> I switched to 44.1kHz the sampling frequency was wrong and again after
>>>> stopping and restarting the track it was correct.
>>>>
>>>> I did the reboot of the laptop and this time I started with 44.1kHz and
>>>> the sampling rate frequency was correct. When I changed to 96kHz track
>>>> the sampling frequency was wrong but after stop and restart it was
>>>> correct. And if I changed to 44.1kHz from the sampling rate was again
>>>> wrong, but was correct after I stopped and restarted the track.
>>> I think we can conclude that the VIA VT1731 has the same issue as the
>>> C-Media CM6631.
>>>
>>> I'll add the VT1731 as one of the devices that needs a reset after
>>> sample rate change in the next iteration of the sample rate workaround
>>> patch.
>>    
>>     If I understand correctly, the new iteration will improve the v3?
>>     So I should probably wait for the next iteration before modifying
>> and inserting v3?
>>     Or could I live "happily ever after" with the v1 pcm.c patch instead
>> of  clock.c?
> The current version is v4, I'll probably post v5 with VT1731-support
> tomorrow. I have attached a "v4.5", that is v4 + VT1731-support. If you
> could test that and report back, that would be great.

I tested switching between rates with the "v4.5" patch and no problems
were noticed.


>
>>     I posted a note on head-fi forum and asked other users of Audio-gd
>> devices who use Linux to send me the lsusb -v output. I am not sure if
>> idVendor and idProduct  is the same for all x.32 series, although they
>> all use the VIA VT1731 chip.
> Nice.
>
>>     If I get any informations with different id's, should I mail them to
>> you, or on alsa-users mailing list?
> Please always Cc: the list.
>
>
> Torstein
I removed the above mentioned attached patch "v4.5", so Torstein can
decide when and where to post it.


Thanks for all the help,
Davor.