USB tablet support sometimes confuses VMs

[Quentin Smith]

Some distros misinterpret the USB tablet that we provide, and they end up with both a /dev/input/mouse0 for the regular PS/2 mouse and a /dev/input/mouse1 for the USB tablet. X then listens on /dev/input/mice, which is the union of all mouse devices in the system. The result is that these distros see every mouse movement twice, which makes it impossible to sync your cursor. On SystemRescueCD, this presents as:

drwxr-xr-x 4 root root 240 2009-01-03 17:50 /dev/input
drwxr-xr-x 2 root root 80 2009-01-03 17:50 /dev/input/by-id
lrwxrwxrwx 1 root root 9 2009-01-03 17:50 /dev/input/by-id/usb-QEMU_0.9.0_QEMU_USB_Tablet_1-event-joystick -> ../event3
lrwxrwxrwx 1 root root 9 2009-01-03 17:50 /dev/input/by-id/usb-QEMU_0.9.0_QEMU_USB_Tablet_1-joystick -> ../mouse2
drwxr-xr-x 2 root root 140 2009-01-03 17:50 /dev/input/by-path
lrwxrwxrwx 1 root root 9 2009-01-03 17:50 /dev/input/by-path/pci-0000:00:01.3-usb-0:2:1.0-event-joystick -> ../event3
lrwxrwxrwx 1 root root 9 2009-01-03 17:50 /dev/input/by-path/pci-0000:00:01.3-usb-0:2:1.0-joystick -> ../mouse2
lrwxrwxrwx 1 root root 9 2009-01-03 17:50 /dev/input/by-path/platform-i8042-serio-0-event-kbd -> ../event1
lrwxrwxrwx 1 root root 9 2009-01-03 17:50 /dev/input/by-path/platform-i8042-serio-1-event-mouse -> ../event2
lrwxrwxrwx 1 root root 9 2009-01-03 17:50 /dev/input/by-path/platform-i8042-serio-1-mouse -> ../mouse1
crw-r----- 1 root root 13, 64 2009-01-03 17:50 /dev/input/event0
crw-r----- 1 root root 13, 65 2009-01-03 17:50 /dev/input/event1
crw-r----- 1 root root 13, 66 2009-01-03 17:50 /dev/input/event2
crw-r----- 1 root root 13, 67 2009-01-03 17:50 /dev/input/event3
crw-r----- 1 root root 13, 63 2009-01-03 17:50 /dev/input/mice
crw-r----- 1 root root 13, 32 2009-01-03 17:50 /dev/input/mouse0
crw-r----- 1 root root 13, 33 2009-01-03 17:50 /dev/input/mouse1
crw-r----- 1 root root 13, 34 2009-01-03 17:50 /dev/input/mouse2