I can confirm this bug in a Vostro V13 with Ubuntu 10.04 LTS.
% uname -a Linux hostname 2.6.32-22-generic #36-Ubuntu SMP Thu Jun 3 19:31:57 UTC 2010 x86_64 GNU/Linux
Section of /proc/sys/input/devices:
I: Bus=0011 Vendor=0002 Product=0001 Version=0000 N: Name="PS/2 Generic Mouse" P: Phys=isa0060/serio2/input0 S: Sysfs=/devices/platform/i8042/serio2/input/input11 U: Uniq= H: Handlers=mouse1 event10 B: EV=7 B: KEY=70000 0 0 0 0 B: REL=3
I can confirm this bug in a Vostro V13 with Ubuntu 10.04 LTS.
% uname -a
Linux hostname 2.6.32-22-generic #36-Ubuntu SMP Thu Jun 3 19:31:57 UTC 2010 x86_64 GNU/Linux
Section of /proc/sys/ input/devices:
I: Bus=0011 Vendor=0002 Product=0001 Version=0000 serio2/ input0 devices/ platform/ i8042/serio2/ input/input11
N: Name="PS/2 Generic Mouse"
P: Phys=isa0060/
S: Sysfs=/
U: Uniq=
H: Handlers=mouse1 event10
B: EV=7
B: KEY=70000 0 0 0 0
B: REL=3