problem to access /proc/acpi/battery/BAT1/* files

Hi all,
on my RH9 2.6.0-test6 I noticed a strange log in /var/log/messages:

Oct 17 18:15:16 localhost kernel:  dswload-0269: *** Error: Looking up [PBST] in namespace, AE_ALREADY_EXISTS
Oct 17 18:15:16 localhost kernel:  psparse-0589 [293932] ps_parse_loop         : During name lookup/catalog, AE_ALREADY_EXISTS
Oct 17 18:15:16 localhost kernel:  psparse-1121: *** Error: Method execution failed [\_SB_.PCI0.LPC0.BAT1._BST](Nodec12ab328), AE_ALREADY_EXISTS
Oct 17 18:15:25 localhost kernel:  dswload-0269: *** Error: Looking up [PBST] in namespace, AE_ALREADY_EXISTS
Oct 17 18:15:25 localhost kernel:  psparse-0589 [294043] ps_parse_loop         : During name lookup/catalog, AE_ALREADY_EXISTS
Oct 17 18:15:25 localhost kernel:  psparse-1121: *** Error: Method execution failed [\_SB_.PCI0.LPC0.BAT1._BST] (Node c12ab328), AE_ALREADY_EXISTS

the problem arises when on my system two programs access concurrently the files into /proc/acpi/battery/BAT1/*

for example I run the cpufrequency, a daemon to switch CPU frequency on my P4 laptop http://sourceforge.net/projects/cpufrequency/
(this program checks every some seconds the status of battery)
and I use

      watch -n 8 "cat /proc/acpi/battery/BAT1/*"

to see the battery state in another xterm.

Is there any kind of lock to access the status of battery?

thanks for your time,
Paolo Dovera