Public bug reported:

Binary package hint: linux-image-2.6.20-15-generic

ACPI seems to be extremely slow. Suspending works, but takes
approximately two minutes to complete a full cycle. Querying various
/proc/acpi entries takes a long time. For example:

$ time cat /proc/acpi/battery/BAT0/state 
present:                 yes
capacity state:          ok
charging state:          charging
present rate:            2740 mW
remaining capacity:      44660 mWh
present voltage:         12572 mV

real    0m8.508s
user    0m0.004s
sys     0m0.000s

This causes some UI problems with some applications and applets that
poll this file. In addition, hald takes a long time to start up
(delaying most of the time on "modprobe battery" according to Bash's -x
) and lid and button ACPI events are not recognised at all. Identical
problems with the latest stock Debian 2.6.18 and 2.6.20 kernels.

** Affects: linux-source-2.6.20 (Ubuntu)
     Importance: Undecided
         Status: Unconfirmed

-- 
Extremely slow ACPI on Thinkpad R51e
https://bugs.launchpad.net/bugs/107826
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