I have the same problem with my Dell Inspiron 5150. Battery status AND 
temperature reading stopped working when I upgraded from 2.6.0-test11-mm 
to 2.6.0-mm1. I noticed it because klaptop stopped showing the battery 
charge status, and gkrellm2 stopped showing the battery and temperature 
status (stuck at 25C). Actually, the only thing that still works with 
the battery is wether the AC is plugged in or not. Here is my /proc and 
dmesg from 2.6.0-mm1. I can reboot and show you the working test11-mm 
stuff as well, if needed.

root-2T+B9ReNDUQ@public.gmane.org maalox # cat /proc/acpi/thermal_zone/THM/temperature
temperature:             25 C

root-2T+B9ReNDUQ@public.gmane.org maalox # cat /proc/acpi/battery/BAT0/alarm
alarm:                   unsupported

root-2T+B9ReNDUQ@public.gmane.org maalox # cat /proc/acpi/battery/BAT0/info
present:                 yes
design capacity:         0 mWh
last full capacity:      0 mWh
battery technology:      non-rechargeable
design voltage:          0 mV
design capacity warning: 0 mWh
design capacity low:     0 mWh
capacity granularity 1:  0 mWh
capacity granularity 2:  0 mWh
model number:
serial number:
battery type:
OEM info:

root-2T+B9ReNDUQ@public.gmane.org maalox # cat /proc/acpi/battery/BAT0/state
present:                 yes
capacity state:          ok
charging state:          unknown
present rate:            0 mW
remaining capacity:      0 mWh
present voltage:         0 mV

All the 0 readings have actual numbers with test11-mm, as well as model 
number, serial number, ...

Thanks,
Mark


From: Brown, Len <len-lUQJ9CVx3tM@public.gmane.org>
RE: acpi-20031203-2.6.0.diff brokes the battery status readings with 
2.6.0 in DELL Inspiron 8500
2003-12-19 08:11

  dmesg from before and after would help, plus the info under 
/proc/acpi/battery.

  Thanks,
  -Len

  > -----Original Message-----
  > From: acpi-devel-admin-I+uqrFQUvWk@public.gmane.org
  > [mailto:acpi-devel-admin-I+uqrFQUvWk@public.gmane.org] On Behalf Of
  > Pere Castaņer
  > Sent: Thursday, December 18, 2003 7:00 PM
  > To: acpi-devel
  > Subject: [ACPI] acpi-20031203-2.6.0.diff brokes the battery
  > status readings with 2.6.0 in DELL Inspiron 8500
  >
  >
  > I've just aplyied last patch into 2.6.0 stable release and it
  > brokes the battery monitor from acpi in
  > /proc/acpi/battery/BAT0/status...because of this
  > gnome-battery applet don't shows any information.
  >
  > Do you need more information?
  >
  > PS:with acpi included on 2.6.0 all works fine.