can't mount root disk with ACPI enabled

[Sepherosa Ziehau]

On Wed, Jun 3, 2009 at 9:31 PM, Johannes Hofmann
<johannes.hofmann at gmx.de> wrote:
> Johannes Hofmann <johannes.hofmann at gmx.de> wrote:
>> Sepherosa Ziehau <sepherosa at gmail.com> wrote:
>>> On Tue, May 19, 2009 at 8:23 PM, Johannes Hofmann
>>> <johannes.hofmann at gmx.de> wrote:
>>>> Sepherosa Ziehau <sepherosa at gmail.com> wrote:
>>>>> On Tue, May 19, 2009 at 7:33 PM, Johannes Hofmann
>>>>> <johannes.hofmann at gmx.de> wrote:
>>>>>> Hi,
>>>>>>
>>>>>> starting with revision
>>>>>>
>>>>>> commit 50b53814fb840b70162a846420b75c5bb9432931
>>>>>> Author: Sepherosa Ziehau <sephe at dragonflybsd.org>
>>>>>> Date:   Sun May 17 13:11:50 2009 +0800
>>>>>>
>>>>>>    More clock cleanup:
>>>>>>
>>>>>>    - Move rtc initialization to SI_BOOT2_CLOCKREG, SI_ORDER_FIRST
>>>>>>    - Staticize cpu_initclocks()
>>>>>>
>>>>>>
>>>>>> My thinkpad T42 fails to mount the root device with ACPI enabled. When
>>>>>> I boot without ACPI it works fine.
>>>>>
>>>>> Looks like acpi timer is whacked.  Could you do following test:
>>>>> set debug.acpi.disabled="timer"
>>>>> and boot the problematic kernel?
>>>>
>>>> This doesn't help. Unfortunately I can't read the complete console
>>>> output when it fails...
>>>
>>> OK, before I could figure out what's wrong with the reordering, I
>>> revert the commit.  Please re-pull HEAD.
>>
>> With current HEAD it works fine again - as expected.
>
> 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.

>
> 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
w/o ACPI, w/ usb modules
I think using these two combinition, your box is booting?

BTW, what will happen if you load USB modules after boot?

Best Regards,
sephe

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