To all developper's attempting to fix this bug:

This problem exists in the __kernel__.  Not in evdev.  Not in X.  Not in
Gnome, KDE, or anywhere else.

Quirking the evdev driver does not fix this problem - and your evdev
driver AND the kernel will probably be faced with increased CPU time as
a result of key-event message passing.  What happens is that once the
kernel starts spamming the volume up/down key signals to the various
kernel/X input handlers (i.e. anything that begins with
xf86-input-____), X gets spammed with key events, causing the lockups
you're describing.

The reason the kernel spams evdev is quite simple:  We have logs earlier
in this thread that indicate that the physical hardware implementing the
PS/2 protocol on the keyboard do not create a release event for the
volume buttons (this wheel produces "down" ticks, but
__does_not_always__ produce "up" ticks).

Quirking evdev, as per the solution by ktemkin described in this thread,
and on a repeatedly referenced ubuntuforums post, will __not__ stop this
increased key-event message passing!  It will only cause evdev to ignore
the respective key signals from the kernel, but it is an extremely
hackish-fix,and your kernel input handling will still be highly clogged!
Also, the problem will reoccur if you (or ubuntu official) were ever to
switch away from using xf86-input-evdev.

The problem starts WAY earlier than evdev.  It (likely) exists in the
input/drivers/atkbd.c kernel input driver.  What this fix needs is a
quirk for the key scancodes that are not producing "release" events, so
that the linux kernel can give "keyup" events for evdev, any other
xf86-input handlers, and the resulting userspace applications that use
these input handlers.  Then your volume wheel will work normally.

We need to get some kernel bugfixers in here!  I would fix this myself,
but real-life work is unfortunately taking the majority of my time.

I hope this will jumpstart a fix -- i know it's rough trying to find
someone to get this stuff done!

-- 
Toshiba Satellite U300 volume wheel sticking
https://bugs.launchpad.net/bugs/271706
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