linux-kernel - Re: 2.6.21-rt9 problem : xruns

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Date:	Fri, 29 Jun 2007 22:26:51 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	skyball000@...esurf.fr
cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.21-rt9 problem : xruns

On Fri, 29 Jun 2007 skyball000@...esurf.fr wrote:

> Hi,
> 
> I've recently compiled a "vanilla" 2.6.21 kernel, patched with Ingo Molnar's
> rt-8 patch, as I was unable to compile with rt-7.
> 
> I needed it because I'm using audio applications (tests were made with
> FrugalWare, but I don't think it's a distro issue).
> 
> Everything was allright until I changed my motherboard for an  Asrock
> 4coreDual-Vsta (I formerly used a Nforce4 one), with VIA PT880 Ultra chipset.
> 
> I've justed switched the hardware, as Linux is neat enough to boot without
> having to reinstall the whole OS.
> 
> Since, I get tons of xruns when using RT applications, and the only solution
> I've found to "fix" it was to disable ACPI at boot time.

Interestingly, this looks very similar to a problem I had... Could you, 
please, verify if acpid is running (with ACPI configured on), and if yes - 
stop it and retest for xruns?

Thanks
Guennadi

> Moreover, I get this message at boot time :
> PCI: BIOS bug: MCFG area@...00000 is not E820 reserved
> PCI: not using MMCONFIG
> 
> I've also tested this hardware setup with a UbuntoStudio kernel (2.6.19),
> and everything works flawlessy (no XRUNS, no kernel messages) !
> 
> So here is my question (I'd like to understand what's happening) :
>    - is it a kernel (or patch) issue ?
>    - is it a bad chipset support in the latest kernel versions ?
>    - could this be related to BIOS issues only (I've tried all available
> versions without any change) ?
>    - should I use special settings in the ".config" in order to avoid these
> problems ?
> 
> I wasn't able to detect what causes these XRUNS, so if anyone has clues ...
> 
> Regards
> skb
> 
> 
> 
> 
> 
> -
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---
Guennadi Liakhovetski
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