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SubjectRe: [BUG 2579] linux 2.6.* sound problems
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 <> wrote:
>>>>> starting from 2.6.0 (2 years ago) i have the following bug.
>>>>> link:
>>>>> fast summary:
>>>>> when playing audio and using a bit the harddisk (i.e. md5sum of a
>>>>> 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.

Ondrej Zary

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