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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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