Do you see any errors in /var/log/Xorg.0.log or dmesg output?
Proceed as following:
1. Just after being logged in as user zxz run the following command from a 
terminal:
   $ cp /var/log/Xorg.0.log ~/Xorg.0.log_zxz
2. Switch the user to drivex
3. $ sudo cp /var/log/Xorg.0.log /home/zxz/Xorg.0.log_drivex
4. Switch back to user zxz
5. $ LANG=C
   $ diff -ns ~/Xorg.0.log_zxz ~/Xorg.0.log_drivex > Xorg.0.log_diff-ns
   $ cp /var/log/dmesg ~/dmesg_boot
   $ dmesg > ~/dmesg
   $ diff -ns ~/dmesg_boot ~/dmesg > dmesg_diff-ns
6. Attach Xorg.0.log_zxz, Xorg.0.log_diff-ns, dmesg_boot and dmesg_diff-ns to 
the bug report.

-- 
Multiple mouses don't work with multiple users
https://bugs.launchpad.net/bugs/125340
You received this bug notification because you are a member of Ubuntu
Bugs, which is the bug contact for Ubuntu.

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