2.6.21 -- polling /proc/acpi/battery/*/state breaks ibm_acpi

[Andreas Messer <andreas.messer@stud-mail.uni-wuerzburg.de>]

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Hello,

Up to Kernel 2.6.20 ibm_acpi was working fine on my TP X21.
At least all Fn + <?> Keys worked. Now, since 2.6.21 it generally
works but: When some Application is polling /proc/acpi/battery/*/state,
the Fn - Keys (and perhaps the Lid-Button) became disfunctional until
the next reboot. (Terminating the App didn't help)
I can also produce the problem with a simple loop on cmd-line:

while true; do cat /proc/acpi/battery/BAT0/state; done

I figured out, that after system boot I can do a
cat /proc/acpi/battery/BAT0/state for at least 3 times without
breaking ibm_acpi. But then suddenly the keys FN - Keys are dead.

greetings
Andreas
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