Here some additions from dumb checking a few test cases here ;-)

Test                                                   |  A.MX  |  M515  |
-------------------------------------------------------|--------|--------|
Just reboot running system *                           |   ok   |   no   |
reboot, moving mouse *                                 |   ok   |   ok   |
power down, mouse OFF, boot up, mouse ON               |   ok   |   ok   |
switch mouse OFF, then ON when not working             |   no   |   no   |
remove receiver, then reattach when mouse not working  |   no   |   no   |
boot up while mouse activity LED is ON *               |   ok   |   --   |
boot up when mouse activity LED is OFF *               |   no   |   --   |

I have also tested if it matters wether the mouse is ON or OFF BEFORE
shutdown/reboot: No, it doesn't seem to be the case.

* The M515 has touch sensors that send the mouse to powersave almost
immediately after the hand is removed from the mouse's surface
(especially the sides). The Anywhere MX in contrast seems to have the
classical timeout mechanism, going into powersave after a minute or so
after it has last been moved. So that seems to be the reason why it
passes the first test (simple restart), whereas the M515 doesn't. It
also feeds the assumption that the mice's powersave mode is key to the
problem. However, remember that the problem ocurred in 12.04 Precise
first, the mice are working without these problems in earlier releases.
So it's not a mouse problem after all.

= Conclusion =

I think it is fair to conclude that the mouse is not recognized at boot
when in idle/inactive/powersave mode. If you agree, I suggest to change
the Bug's summary accordingly, to something like "Logitech Unity Mice
are not recognized on boot when in powersave state" and link more
specifically to the 12.04 Precise release (if possible), or an adequate
package.

= Erratum =

Seems I have let myself to be confused in the first place: The new
Logitech receiver is known as "Unifying Receiver", so no danger of
confusion except for those like me who are not good at reading and/or
remembering :-)

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https://bugs.launchpad.net/bugs/958174

Title:
  Wireless Mouse not registered on Startup or Reboot

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