ThinkPad - UltraBay battery magic

[Kevin Oberman]

> From: "Dan Langille" <dan at langille.org>
> Date: Sat, 17 Jun 2006 21:08:54 -0400
> 
> On 17 Jun 2006 at 16:54, Kevin Oberman wrote:
> 
> > > When installing a 2nd battery (i.e in the UltraBay after removing the 
> > > CD drive) in a ThinkPad, I think there's some magic you must invoke 
> > > to get the system to notice the additional power resource.
> > > 
> > > Any ideas?
> > 
> > The code to allow ACPI to add batteries has yet to be written (or committed, 
> > at least). If the system is booted with 2 two batteries, both will be seen. 
> > Even it one is removed and then returned, it will be seen. But if a system is 
> > booted with a single battery, ACPI will not ever see the second battery.
> > 
> > Please note that the second battery WILL be seen by the hardware and both 
> > charged and used.
> 
> I rebooted.  It froze after probing ad0.  I powered off.  I removed 
> the spare battery. I rebooted.  Froze again, same place.  I put in 
> the CD drive, it booted fine.  I swapped out the CD drive and put the 
> battery back in.  This time I did a verbose boot.
> 
> In short:
> both batteries are seen in the probing.
> ad0 is probed
> pcm0 is measured
> fdc0: output ready timeout
> [repeat above line 7 times]
> GEOM: new disk ad0
> 
> Screen shot here:
> 
>   http://www.langille.org/tmp/100_2831.jpg
> 
> Ideas? Suggestions?

This is sounding just a bit familiar. Do you actually have a floppy
drive? If so, try putting a disk into it. If not, try building a kernel
without the floppy and see if that behaves.

There have been several similar reports. You might want to look at the
archives.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634