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Message-ID: <43673B6F.5030909@gmail.com>
Date: Tue, 01 Nov 2005 10:54:55 +0100
From: Patrizio Bassi <patrizio.bassi@gmail.com>
Reply-To: patrizio.bassi@gmail.com
Organization: patrizio.bassi@gmail.com
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To: Ondrej Zary <linux@rainbow-software.org>,
       "Kernel, " <linux-kernel@vger.kernel.org>
Subject: Re: [BUG 2579] linux 2.6.* sound problems
References: <53L1x-6dC-13@gated-at.bofh.it> <53LkE-6QU-5@gated-at.bofh.it> <53LkW-6QU-49@gated-at.bofh.it> <53LEq-7gr-7@gated-at.bofh.it> <43667406.9070104@gmail.com> <4366A49F.3000101@rainbow-software.org>
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Ondrej Zary ha scritto:

> Patrizio Bassi wrote:
>
>> Ray Lee ha scritto:
>>
>>> On Mon, 2005-10-31 at 18:04 +0100, Patrizio Bassi wrote:
>>>
>>>
>>>>> On 10/31/05, Patrizio Bassi <patrizio.bassi@gmail.com> wrote:
>>>>>
>>>>>
>>>>>> starting from 2.6.0 (2 years ago) i have the following bug.
>>>>>> link: http://bugzilla.kernel.org/show_bug.cgi?id=2579
>>>>>
>>>
>>>
>>>>>> fast summary:
>>>>>> when playing audio and using a bit the harddisk (i.e. md5sum of a
>>>>>> 200mb
>>>>>> file) i hear noises, related to disk activity. more hd is used,
>>>>>> more chicks
>>>>>> and ZZZZ noises happen.
>>>>>
>>>>>
>>>>> Does hdparm -i (or -I) show differences between the 2.4 kernels and
>>>>> 2.6? 2.6 has new IDE drivers, and so perhaps your system isn't using
>>>>> the best driver any more.
>>>>>
>>>>> You may also want to compare lspci -vv of your IDE controller and
>>>>> sound card between 2.4 and 2.6, and see if there are any differences.
>>>>>
>>>>> No guarantees, but this is where you'd start.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> Ready to test any patch/solution.
>>>>>
>>>>>
>>>>>
>>>>> Try that. If nothing obvious appears in the examination, you may want
>>>>> to try the 2.6.14-rt1 patchset from Ingo Molnar. It's designed to
>>>>> reduce latency in the kernel, but also has a latency tracer that may
>>>>> be particularly useful for your problem. (Assuming it's a latency
>>>>> issue, and not a hardware misconfiguration due to 2.6 doing something
>>>>> wrong.)
>>>>
>
> I've seen something like this yesterday on ECS P6EXP-Me board (i440EX
> chipset) with onboard CMI8338 PCI sound chip. The sound was distorted
> when e.g. moving mouse in Windows. When I disabled "PCI 2.1 support"
> in BIOS, the problem disappeared in Windows. But when I booted Slax
> LiveCD, the same problem appeared - so I think that Linux enables
> something that's causing these problems with some PCI sound devices on
> these chipsets.
>
i played a bit with bios, but no luck.
considering that in my windows copy i have no problems, i'm sure it's
linux 2.6

update: can't use linux 2.4, i have nptl only and acpi problems too.
i'll play with timers and latency
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