can't mount root disk with ACPI enabled

[Johannes Hofmann]

05o11af6e11m974a3ce19d00f8c6 at mail.gmail.com>
User-Agent: tin/1.8.3-20070201 ("Scotasay") (UNIX) (DragonFly/2.3.1-DEVELOPMENT (i386))
Date: 04 Jun 2009 10:59:09 GMT
Lines: 44
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Xref: crater_reader.dragonflybsd.org dragonfly.bugs:10237

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

Unfortunately boot -v doesn't work here because it loops detecting the
cdrom device.

Regards,
Johannes