[Marveric Beta] Result of testing some firewire devices

[Ricardo Lameiro]

Hi Takashi et al

I also tested Firewire devices on the Ubuntustudio Beta.
My device is a Edirol FA-101.
What I can say is that it worked out the box, just configuring it right in
Jack.
I had almost no XRUNS (ocasional XRUN when opening a jack app like Ardour,
its normal) using the generic kernel.
This is a great improvement since past setups, since it was almost mandatory
to use a RT kernel with Firewire devices.
True to be told, I was working at 16ms latency, maybe with the old stack, I
could go to 8 ms and less XRUNS.
There is also a point that most of users sometimes miss, the hardware...
The Firewire chipset is a key element for the stability of a good and stable
stream of data on the FW bus. this is not only related to Linux, but to all
the operative systems, and it is recommended, by specialist the usage of
Texas instruments Firewire chipsets (TI).
Unfortunately, I have a Ricoh chipset on my laptop, but one of this days I
will try to find a pcmcia card with a TI chipset.

I think that reporting devices not working on the new stack should be
reported not only to ubuntu, but also to upstream FFADO. If FFADO fixes some
driver, then everyone will benefit from the changes.

greetings

2010/9/28 Takashi Sakamoto <o-takashi at sakamocchi.jp>

> Hi,
>
> I test my firewire audio device, M-Audio Firewire Solo and MOTU 828 Mk2
> on Ubuntu Studio Marveric Beta. And I found some changes from Marveric.
>
> 1. default jackd is version 2.
> As you know. We can change jackd2 to jackd1 in synaptic exclusively.
>
> 2. New firewire stack (?) is default
> The default kernel modules for firewire is firewire_ohci, firewire_core,
> crc_itu_t as a result of running "lsmod".
> In lucid, these are raw1394, ohci1394, ieee1394.
> The developper of FFADO seem to call the former as "new firewire stack"
> and latter as "old firewire stack".
>
> I read some documents of FFADO and they reccomend to use old firewire
> stack. But it seems to be old for me. So I test my devices in both stacks.
>
> 2. both of my device work but...
>
> I can connect jackd2 to my M-Audio FW Solo with both stacks but to 828
> Mk2 only with old firewire stack. I use "rmmod" and "modprobe" commands
> much time in this operation.
>
> M-Audio Firewire Solo works fine in both stacks.
> MOTU 828 Mk2 works in old stack but the sound is the worst.
>
> 3. new stack makes more FFADO XRUNs than old stack
>
> Then I use Renoise 2.6.6 (Beta) because this version can run under
> jackd2 in the same device (M-Audio FW Solo). I played the same sample
> music in both stacks. As a result, I got more FFADO XRUNs than old stack.
>
> You can see my report in launchpad.
>
> MOTU 828 Mk2 works but the sound is noisy, like buzzing.
> https://bugs.launchpad.net/ubuntu/+source/libffado/+bug/649542
>
> New firewire stack makes more FFADO XRUNs than old firewire stack.
> https://bugs.launchpad.net/ubuntu/+source/libffado/+bug/649583
>
> Please post to this mailing list if you know the other changes between
> lucid and marveric.
>
> Thanks
>
>
> Takashi Sakamoto
> o-takashi at sakamocchi.jp
>
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-- 
Fagote / Contrafagote
Bassoon / Contra-bassoon
http://myspace.com/ricardolameiro
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