Repeating comment from duplicate bug #364442:

The problem is that on ThinkPads, these buttons *also* have an effect at
the hardware level; we have previously been overriding the defaults of
the thinkpad-acpi module to force these button presses to be exposed to
userspace, but there is no way to disable the action in hardware, so we
end up with double handling.

The short-term fix for this is to /not/ override the kernel module and
expose these keypresses to userspace. This has the unfortunate side-
effect of leaving us without OSD for these keys, but this is effectively
because hal/gnome-settings-daemon are not equipped to deal with this
kind of "notification-only" mixer event, and there are currently no
standard linux input key events defined for this.

In the long term, we need a good way to expose these mixer changes to
userspace, but reverting to the previous behavior isn't more correct
than what we're currently doing.

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No notification when sliding audio volume, muting volume, sliding LCD 
brightness on X31, X32, T60, R50e, T42
https://bugs.launchpad.net/bugs/357673
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