Two mice pointers (xinput stuff) issue (logs me off)

I'm trying to use two mice (mouse pointers) on my laptop (Linux Mint 16) so I've been following some tutorials that I found: the idea is to work with the xinput command. I have two mice (Touchpad and a wireless one). So I create a new master xinput --create-master secondmice it seems to work since a new pointer appears on the screen (I can't move it though). Then I "bind" it to a mouse (the wireless one): xinput reattach ID_WIRELESS ID_SECONDMICE it looks ok for no error occurs. Once it's done I start moving the mice (wireless) to test. But it immediately crashes and logs me off. When I log back in, everything's alright, but I still have only my one unique pointer. Why does it crashes? I checked log files and I couldn't find anything "weird" or that might helped me (/var/log/Xorg.0.log, /var/log/messages, ~/.xsessions-errors...) EDIT: When it crashes a black-screen shows up (tty), right before I got on the "Log-in page", here's what we can read: Linux Mint 16 Petra MyComputerName tty1 MyComputerName: [ 24.263867] brcmsmac bcms0:0: brcmsmac: brcms_ops_bss_info_changed: associated [ 24.264035] brcmsmac brcms0:0: brcms_ops_bss_info_changed: qos enabled: true (implement) "MyComputerName" is computer name. I've searched those terms with Google but it's more related to Wifi than xinput.