Just found a thread on ubuntuforums that confirms that this isn't just my hardware, and that it's a problem that seems to have cropped up with Dapper...
http://ubuntuforums.org/showthread.php?t=206385 >From some of the comments in that thread, it seems to be a general USB problem, not merely a mouse issue. -- Mouse doesn't get turned off on system shutdown https://launchpad.net/bugs/48773 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
