Re: [BUG 2579] linux 2.6.* sound problems

From: Patrizio Bassi (patrizio.bassi_at_gmail.com)
Date: 11/01/05

  • Next message: Paul Mackerras: "Re: [PATCH consolidate sys_ptrace" 
    Date:	Tue, 01 Nov 2005 10:54:55 +0100
To: Ondrej Zary <linux@rainbow-software.org>, "Kernel, " <linux-kernel@vger.kernel.org>

    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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