I am also currently affected by this bug in Intrepid. It may have been
there last week as well, or it may have appeared in intrepid in the last
couple of days. It's bad in that folks could get frustrated and lose
their work if they are using gtk based apps where file menus are failing
to work.  The above is a great description of this bug... but see below
for my take on it:

The only thing that I would add is that a single press of the keyboard
brightness adjustment combo (Fn + down arrow) seems to register as if
the key was constantly down... i.e. brightness goes from 100% and
rapidly shrinks to 0% after only one light keypress.  The repeated
phantom "keypresses" start as soon as you release the Fn key in the
combo.  For me the brightness heads-up display widget also stays in the
foreground on top of other windows.

With these phantom keypresses perhaps the keyboard buffer could be
staying filled and this could be causing the keyboard malfunctions and
the menus failing to appear on mouseclick?  Menus on apps which aren't
GTK based still seem to work, perhaps the display of non-gtk menus
aren't interrupted by the continual keyboard events?

I am on an Inspiron 640m with intel graphics.  I am running Compiz, but
this bug also manifests with Compiz disabled.

-- 
After Upgrade to 8.10: Keyboard & Mouse Issues after using keyboard to change 
the display brightness
https://bugs.launchpad.net/bugs/287328
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