[Bug 39509] Re: Extended keys not working on Logitech MX 700 keyboard

[Rob Hughes]

Actually, this needs to move to xorg. I found the root problem. Xorg is trying to be smarter than the user. When I set up my udev rules to allow both mouse and keyboard events to come through the same symlinked event interface, xorg sees the keys on the mouse device and sets it up as a keyboard device. This, of course, causes xorg to fail to start since xorg then doesn't have a core pointer.

And if you're wondering why anyone in their right mind would want both keyboard and mouse events to come through the same event interface, try installing a logitech mx 3100 combo set (mx 700 kb + mx 1000 mouse). This is the only way to make the extended keys work.

Since it worked in hoary, there should be a way to make all this work in dapper.
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Extended keys not working on Logitech MX 700 keyboard
https://launchpad.net/malone/bugs/39509