Comment 6 for bug 94597

Additionally, whatever changes you make in the mouse settings interface don't seem to survive a reboot (I've just checked).
Instead, you need to tell udev to set the resolution, etc, every time a logitech device is detected. What I have done is install logitech_applet (as mentioned before), and use something like the following in the logitechmouse.rules file (this one is the line for the MX510):

SYSFS{idProduct}=="c01d", SYSFS{idVendor}=="046d", MODE="660", GROUP="plugdev", RUN+="/usr/bin/logitech_applet -e -s 800"

`logitech_applet -h` to list available options.