Thinkpad X61s cannot boot 9.1-BETA1

[John Baldwin]

On Friday, July 20, 2012 10:11:33 am jb wrote:
> Per olof Ljungmark <peo <at> intersonic.se> writes:
> 
> > ... 
> > >> Did anyone else experience this? With 9.1-BETA1 the boot process
> > >> freezes, among the last lines with verbose boot are
> > >>
> > >> acpi_acad0: On Line
> > >> acpi_acad0: acline initialization done, tried 1 times
> > >>
> > >> after this, dead.
> > >> ...
> > Tried ALL boot options, none worked. For example, if I try "disable 
> > acpi" it will stop at "no event timer available".
> 
> Here is something similar ...
> http://forums.freebsd.org/archive/index.php/t-32423.html
> ...
> "When I enabled verbose boot logging, the boot seems to hang up just after the
> kernel load. I have tried disabling ACPI and APIC with the same results.
> 
> Here is where the news starts to turn good. I tried a FreeBSD 9 disk and got
> much further. Then, I was either getting a page fault or panic: no usable event
> timer found depending on boot options. The release errata then set me straight.
> With debug.acpi.disabled="hostres" I was able to boot! ..."
> 
> Here is the related errata:
> http://www.freebsd.org/releases/9.0R/errata.html
> ...
> "[amd64, i386] FreeBSD 9.0-RELEASE includes several changes to improve resource
> management of PCI devices. Some x86 machines may not boot or may have devices
> that no longer attach when using ACPI as a result of these changes. This can be
> worked around by setting a loader(8) tunable debug.acpi.disabled to hostres. To
> do this, enter the following lines at the loader prompt:
> 
> set debug.acpi.disabled="hostres"
> boot
> 
> Or, put the following line into /boot/loader.conf:
> 
> debug.acpi.disabled="hostres"
> ..."
> 
> Anyway, regardless of this attempt, file a PR# for 9.1-BETA1.

Please try this and let me know if it works.  The bugs that I knew of related to
"hostres" should be fixed in 9.1, so if there are still problems I'd like to
know about it.

-- 
John Baldwin