I'm having problems to make an old 2-buttons PS/2 Compaq mouse with an old computer I recently upgraded. I have a partition with win2000 and everything works fine (you know, my sisters and parents need win), and in Fedora Core 2, the distro installed previously with winxp, everything worked fine too, but I did not saved any configuration file nor remember anything about it (since I wasn't able to install a linux distro those years). The mouse is correctly configured in Xorg (ArchLinux provided package), I'm sure of it, and it's not problem of the software because GPM nor cat /dev/psaux works. I made a diagnostic and it tells me that it's the port which isn't configured (I'm talking of me permutating hardware/config, not a program which could tell what is going wrong), because it doesn't work with any working mouse and configuration but it works with my USB keyboard with PS/2 port in it.

So, I guess it's a misconfiguration in the kernel level, maybe the system it's not loading the correct modules. I tried probing psmouse, evdev, etc, but I have a little clue: the motherboard has much of it from SiS, I don't really have a chipset but there's one thing in lspci and lshwd that is strange, and is that I have a "PCI-ISA" bridge AGP which doesn't have module. I can't understand how input from the mouse can be affected by AGP, but's that's all I know.