[SOLVED] Old Logitech M90 mouse works on my table surface, but a new bought one doesn't. Why?

[RedBlight]

I have a 3 year old Logitech M90 mouse that I have been using seamlessly on my glossy white smooth table surface. Recently, I bought an exact same Logitech M90 mouse, but this new one does not work on this surface.

What could be the reason for this?

 

[BFG-9000]

In general, it's how the focus is adjusted in your optical sensor sample. It has to be focused on the micro-scratches on the surface to work, so you could try shimming up the feet. In three years Logitech may also have changed the sensor or assembly process too--they don't advertise what sensor their lowest-end mice use, so may switch suppliers at any time to reduce costs.

Laser sensors usually have an easier time with low-contrast backgrounds than optical ones (the coherent light from the laser is better at illuminating the scratches), although Logitech themselves claim only their two-laser "Darkfield" sensors will actually work on glass (Microsoft's competing BlueTrack can't do that!).

 

[RedBlight]

"It has to be focused on the micro-scratches on the surface to work, so you could try shimming up the feet."
Haha
Brilliant!
Glossy white surface was not the first surface I used the old mouse on. Its feet probably got eaten up a little bit, before I moved on to this glossy white table. So it worked seamlessly.
New mouse works too, if I apply extra pressure from the top and squish the rubber feet a little.
Thanks a lot for sharing your knowledge.