/proc/acpi/ibm/volume broken on X20 since 2.6.22

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Hello,

at, first, I'm not subscribing ibm-acpi-devel, so CC me, if you want me
to answer. I'm not sure, this to be the right place for my bug report,
but i think so. Up to Kernel 2.6.21 thinkpad-acpi was working fine on my
TP X20. Now, since 2.6.22 setting the volume seems to be broken:
"echo -n mute >/proc/acpi/ibm/volume" leads to an I/O-Error. Doing
the thing with the usual Fn-? Keys is working, also polling the current
volume state works fine. I also tried to do an 
"echo 2 >/sys/.../cmos_command" and got the same error message. Ok, that
was all, I want to tell you. 

Greetings,
Andreas Messer
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