Comment 1 for bug 505019

Please run rinputd with the --verbose option and attach the output. My first guess is that rinputd is receiving the mouse events and sending them to the kernel's event input subsystem, but your Xorg server isn't handling them correctly. This would help us be sure the rinputd server is receiving the events correctly.

If rinputd is receiving the events correctly, watch the rinputd output for which /dev/input/event device node is created for the Remotux client. Capture the output of the device node to a file as you use the mouse on Remotux (cat /dev/input/event? > input.log) and attach the log here as well. This will tell us if the kernel's event input subsystems is propagating the mouse events back up to userspace correctly.

After that I will help analyze the logs to determine where to look next. Since you're running Gentoo (my first real foray into Linux too!) I know there's almost an infinite number of failure points depending on how you've customized your system :).