Thinkpad X61s cannot boot 9.1-BETA1

[Lars Engels]

On Wed, Sep 12, 2012 at 03:54:30PM +0300, Andriy Gapon wrote:
> on 12/09/2012 14:34 Lars Engels said the following:
> > On Wed, Aug 22, 2012 at 08:02:12PM +0200, Thomas Steen Rasmussen wrote:
> >>
> >> -----BEGIN PGP SIGNED MESSAGE-----
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> >>  
> >> On 22-08-2012 18:52, Lars Engels wrote:
> >>> On Wed, Aug 22, 2012 at 02:47:09PM +0200, Thomas Steen Rasmussen wrote:
> >>>>
> >>>> On 22-08-2012 11:33, Lars Engels wrote:
> >>>>>
> >>>>> I have a T61 running 9.1-BETA1 (with PC-BSD). In most cases it is
> >>>>> booting fine, but from time to time it hangs at boot time but the last
> >>>>> lines are uhub0: ... to uhub4
> >>>>> Is that the same or a different issue?
> >>>> Hello,
> >>>>
> >>>> I have that exact issue on an X301 after upgrading from 9.0 to
> >>>> 9-STABLE a little while ago. It feels like it happens mostly when
> >>>> rebooting from Windows to FreeBSD (dualboot machine), but I've
> >>>> seen it from a cold boot as well. I've never seen it twice in
> >>>> a row - turning the machine off and on again (by holding the
> >>>> power button down) and it boots normally the next time.
> >>>>
> >>>> I am willing to test patches or enable extra debugging, or
> >>>> help out any other way I can :)
> >>>
> >>> Have you ever seen that with verbose boot enabled?
> >> Hello,
> >>
> >> No, but I can boot verbosely the next times I boot and see if it comes up ?
> > 
> > Meanwhile I found out what's the cause of it. On 9.x it only hung from
> > time to time, but I tried a few weeks old CURRENT and it hung at every
> > boot at the same time.
> > With enabled verbose boot it looked like this:
> > http://bsd-geek.de/FreeBSD/IMAG0190.jpg
> > 
> > Then I removed the AC cable and booted from battery and that worked. So
> > it seems to me that some ACPI change in CURRENT made the situation even
> > worse.
> > 
> 
> Could you try to play with different eventtimer settings (preferably in current) ?
> You can use this thread / PR as a guide:
> http://thread.gmane.org/gmane.os.freebsd.devel.amd64/14480/focus=14495
> 
> The place where boot stop looks suspiciously close to the place where timer
> interrupts should start driving the system.

Yes, that's it!
Setting  kern.eventtimer.timer="i8254" let's the Thinkpad boot on
CURRENT with the AC cable inserted.
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