ACPI processor module with Atom N270 causes DMA errors

ACPI processor module with Atom N270 causes DMA errors

[Chris Vine]

Hi,

I have a Levono S-12 netbook which uses an Atom N270 processor.
Loading the ACPI 'processor' module clobbers my DMA, specifically when
using the b43 driver for a Broadcom BCM4312 802.11b/g [14e4:4315] low
power phy wireless device.  The b43 driver works correctly if the
processor ACPI module is blacklisted.

This is with kernel 2.6.32-rc5, but the same occurs with earlier
pre-2.6.32 kernels.

Please let me know what further information would be helpful (for
example, the output of dmesg, lspci or lsmod, or other hardware
information).

Chris

Re: ACPI processor module with Atom N270 causes DMA errors

[Alexey Starikovskiy]

Hi Chris,

Please open new bug report against ACPI/Processor in bugzilla.kernel.org
attach outputs from dmesg, acpidump and dmidecode. Kernel config file 
might appear useful too.

Regards,
Alex.

Chris Vine пишет:
> Hi,
>
> I have a Levono S-12 netbook which uses an Atom N270 processor.
> Loading the ACPI 'processor' module clobbers my DMA, specifically when
> using the b43 driver for a Broadcom BCM4312 802.11b/g [14e4:4315] low
> power phy wireless device.  The b43 driver works correctly if the
> processor ACPI module is blacklisted.
>
> This is with kernel 2.6.32-rc5, but the same occurs with earlier
> pre-2.6.32 kernels.
>
> Please let me know what further information would be helpful (for
> example, the output of dmesg, lspci or lsmod, or other hardware
> information).
>
> Chris
>
>
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Re: ACPI processor module with Atom N270 causes DMA errors

[Rafał Miłecki]

2009/10/25 Alexey Starikovskiy <aystarik@gmail.com>:
> Please open new bug report against ACPI/Processor in bugzilla.kernel.org
> attach outputs from dmesg, acpidump and dmidecode. Kernel config file might
> appear useful too.

Chris: after doing so, could you post bug # here, please?

-- 
Rafał
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Re: ACPI processor module with Atom N270 causes DMA errors

[Chris Vine]

On Mon, 26 Oct 2009 00:45:49 +0300
Alexey Starikovskiy <aystarik@gmail.com> wrote:
> Hi Chris,
> 
> Please open new bug report against ACPI/Processor in
> bugzilla.kernel.org attach outputs from dmesg, acpidump and
> dmidecode. Kernel config file might appear useful too.

Thanks.  This is now the subject of further discussion on the bcm43xx
mailing list, as I am glad to say (from my point of view) that Linux
Torvalds is suffering the same problem, albeit not with an Atom.

I will await the outcome of that before posting a kernel bug for the
processor module (there is some suggestion that the BIOS may be at
fault and that kernel ACPI may just be a side effect).

Chris