> >I made a patch to incorporate the latest ACPI CA of intel
> >to -current and made an ad hoc patch to shutdown
> >(migrate to S5 at shutdown).

<snip>

> Is the ACPI stuff complete enough that I can swap devices and batteries 
> in the Ultrabay of my Thinkpad T21?  (If so, I'll switch my laptop to 
> -current tomorrow...)

No, the patch is only a subsystem.  

Hot-plugging of devices should be handled by
each device driver (for example, battery, AC, PCI etc.)
which uses this subsystem.

---
Takayoshi Kochi