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ACPI processor module with Atom N270 causes DMA errors

DISCUSSION Chris Vine 3 participants 4 messages Oct 25, 2009 ACPI

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Chris Vine

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#0 lore raw

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

#1 lore raw

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:

Quoted 15 lines

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).

Quoted 8 lines

Chris

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#2 lore raw

2009/10/25 Alexey Starikovskiy <[email protected]>:

Quoted 3 lines

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?

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#3 lore raw
In reply to Alexey Starikovskiy
Quoted 5 lines · On Mon, 26 Oct 2009 00:45:49 +0300 Alexey Starikovskiy <[email protected]>…

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