[PlanetCCRMA] Problems with 2.4.21 --> jack/alsa

Fernando Pablo Lopez-Lezcano nando@ccrma.Stanford.EDU
Thu Aug 14 15:42:02 2003

> Now that the vacations start to fade out I have a question for those
> working with the 2.4.21 kernel.
> I start up with no errors and apart from my USB ADSL modem being "dead",
> wich is strange but not a big problem, the problem appears when I start
> jack (no matter what options) after a 2/3 seconds it crashes (no sound
> no connections) and does the same every time I restart. there's a
> message saying "Alsa Poll timeout.... ". I have no sound with Alsa alone
> either. I have acpi=off in grub.

Sounds like a misrouted interrupt line (just a guess, of course). I
assume things are not better if you start with acpi active. 

> I have none of this problems with the 2.4.20-18 kernel. Jack works fine
> but the latency is, I imagine higher.

A little bit higher, in some tests I did it was about 10mSecs or so.
This is obviously a 2.4.21 kernel problem (as the same alsa drivers work
with the RedHat kernel). 

I'm trying to build a newer kernel based on 2.4.22 (2.4.22-rc2 at this
point) but the acpi subsystem does not build cleanly. I'm waiting for a
newer version of acpi or a fix from the list (most probably today I'm
going to test a build without the acpi patches). 

-- Fernando