linux-kernel - Re: Warning: pnp 00:0b: can't evaluate

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Message-ID: <CAErSpo5vZSf_EZr6-XnAA8N2Luv6rA92YtZsidWZCZ8rarkPUQ@mail.gmail.com>
Date:	Mon, 23 Apr 2012 16:04:25 -0600
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	sedat.dilek@...il.com
Cc:	linux-acpi@...r.kernel.org, Len Brown <lenb@...nel.org>,
	Adam Belay <abelay@....edu>, linux-kernel@...r.kernel.org,
	Bob Moore <robert.moore@...el.com>,
	Lin Ming <ming.m.lin@...el.com>
Subject: Re: Warning: pnp 00:0b: can't evaluate _CRS: 12311

On Mon, Apr 23, 2012 at 6:03 AM, Sedat Dilek <sedat.dilek@...glemail.com> wrote:
> On Mon, Apr 23, 2012 at 11:48 AM, Sedat Dilek
> <sedat.dilek@...glemail.com> wrote:
>> [ Please CC me I am not subscribed to this ML ]
>>
>> Hi,
>>
>> with a self-compiled linux-3.4-rc4 I am seeing this bugs/failures/warnings:
>>
>> [    0.241572] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored
>>
>> [    0.279385]  pci0000:00: ACPI _OSC request failed (AE_ERROR),
>> returned control mask: 0x1d
>>
>> [    0.293699] system 00:0a: Plug and Play ACPI device, IDs PNP0c02 (active)
>> [    0.294032] ACPI Error: Invalid/unsupported resource descriptor:
>> Type 0x00 (20120320/utresrc-650)
>> [    0.294037] pnp 00:0b: can't evaluate _CRS: 12311
>>
>> The same outputs I have seen also with an unsupported drm-intel-next
>> kernel from Ubuntu/PPA archives [1].
>>
>> What does ist mean? Is it harmless? Buggy firmware/bios?
>>
>> Do you need more background infos (dmesg, kernel-config, etc.)?
>>
>> Regards,
>> - Sedat -
>>
>> [1] http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-next/current/
>
> I have upgraded this Samsung series-5 notebook from BIOS version 05XK
> to 06XK, but the pnp/_CRS warning still remains.

Resource type 0 is "reserved" per the ACPI spec, so this is likely a
BIOS defect.  However, we might be able to handle it better than we
currently do.

I would expect all versions of Linux would report this error -- can
you confirm that or identify a version that didn't complain?  Also,
can you collect an acpidump (see
http://www.lesswatts.org/projects/acpi/utilities.php)?

In acpi_ut_validate_resource(), we return AE_AML_INVALID_RESOURCE_TYPE
(0x3017 == 12311), which explains the messages you see.  The comments
in acpi_ut_walk_aml_resources() suggest that we can't continue because
the length may be bogus if the type is invalid.  But I suspect that if
we just treat it as a zero-length descriptor and ignore it, things
will probably work, and that's likely what Windows does.

Bjorn
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