A very similar thing happens to me with the volume wheel. Using showkeys
in the console reports:
keycode 115 release
keycode 115 press
keycode 115 release
keycode 115 press
keycode 115 release
keycode 115 press
keycode 114 release
keycode 114 press
keycode 114 release
keycode 114 press
keycode
Ops, I added the comment before noticing that this bug was closed.
Continuing on bug#273745
--
X deals badly with keys that fail to send keyup events
https://bugs.launchpad.net/bugs/20681
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