So it's not thinkpad-acpi . The issue is very strange but basically any
kernel past 2.6.22 displays it.

Now here is the kicker. The mute button actually mutes the. But the software 
(Gnome or KDE) does not pick it up when running on a kernel past 2.6.22. So the 
mixers are not aware that things have been muted. So you have no visual that 
things are muted.
 
Had a discussion on ibm-acpi-devel but it's not archived SO I'll past my 
results here:

System:
       Thinkpad T61
       Vendor: LENOVO
       Firmware Version: 7LETA7WW (2.07)
       EC Version: 1.08


Here are my test results (These are kernel.org kernels):

kernel 2.6.22.15 (w/ thinkpad-acpi v0.14) = Works great Gnome can see
                                                                      mute 
button pressed

Kernel 2.6.22.15 (with thinkpad-acpi v0.19) = Works great Gnome can see
                                                                        mute 
button pressed

kernel 2.6.23.13 (w/ thinkpad-acpi v0.16) = Gnome does NOT see mute is pressed
                                                              Mute button is 
not recogonized when try to
                                                               associate it 
with a keyboard action
                                                               using 
gnome-keybing-properties

kernel 2.6.24-rc7 (w/ thinkpad-acpi v0.17) = Gnome does NOT see mute is pressed
                                                              Mute button is 
not recogonized when try to
                                                              associate it with 
a keyboard action using
                                                               
gnome-keybing-properties

Kernel 2.6.24-rc7 (with thinkpad-acpi v0.19) = Gnome does NOT see mute is 
pressed
                                                              Mute button is 
not recogonized when try to
                                                              associate it with 
a keyboard action using
                                                               
gnome-keybing-properties

-- 
Thinkpad T61  mute button no longer works in Hardy. It's back!
https://bugs.launchpad.net/bugs/181177
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