Compaq Presario R4000-series laptops are not sending a "volume up button
release" and "volume down button release" signal in the PS/2 protocol for
atkbd. The URL below has some of confirmed reports:

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/385477Signed-off-by: Dave Andrews <jetdog330@hotmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>