can't mount root disk with ACPI enabled

[Sepherosa Ziehau]

On Thu, Jun 4, 2009 at 6:59 PM, Johannes Hofmann
<johannes.hofmann at gmx.de> wrote:
> Sepherosa Ziehau <sepherosa at gmail.com> wrote:
>> On Thu, Jun 4, 2009 at 2:28 PM, Johannes Hofmann
>> <johannes.hofmann at gmx.de> wrote:
>>> Sepherosa Ziehau <sepherosa at gmail.com> wrote:
>>>>>
>>>>> Just noticed that even with revision
>>>>> 7e7d17cb48838b48389fb990950f2959b9635e63
>>>>> I still can't mount the root disk iff I load usb modules (usb, ehci,
>>>>> umass) during boot via /boot/loader.conf - which I normally don't to
>>>>> allow CPU to enter C3 state.
>>>>
>>>> You box is UP, so only i8254 is used.  C3 does not affect the i8254
>>>> interrupt timer.
>>>
>>> Right, but usb modules prevent the CPU from entering C3 generally
>>> (As far as I know it's a bus mastering DMA thing).
>>>
>>>>
>>>>>
>>>>> So maybe this is just some sort of timing problem?
>>>>> Is anyone else seeing this? I guess thinkpads are quite common here.
>>>>
>>>> This looks very strange, could you give me the bootverbose dmesgs:
>>>> w/ ACPI, w/o usb modules
>>>
>>> http://leaf.dragonflybsd.org/~hofmann/acpi_nousb.dmesg
>>>
>>>> w/o ACPI, w/ usb modules
>>>
>>> http://leaf.dragonflybsd.org/~hofmann/noacpi_usb.dmesg
>>>
>>>> I think using these two combinition, your box is booting?
>>
>> Is ad0 detected w/ ACPI and w/ usb modules?
>
> Ah, just noticed that it's detected as ad1 in that case:
>
> http://leaf.dragonflybsd.org/~hofmann/acpi_usb.dmesg

It looks very strange to me, do you have ATA_STATIC_ID in your kernel
config file?

Best Regards,
sephe

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