From Bugzilla Helper: User-Agent: Mozilla/4.08 [en] (X11; I; SunOS 5.8 sun4u; Nav) 2 button Alps trackpad IDs as 3 button PS/2 mouse C&T F68554 chipset IDs as 65520 Reproducible: Always Steps to Reproduce: 1. Install RH7.1beta on Armada 1540DM Actual Results: On mouse selection screen 3 button PS/2 mouse is highlighted On video chipset selection screen C&T 65520 is highlighted Expected Results: On mouse selection screen Alps trackpad (or at least 2 button PS/2 mouse) should be selected On video chipset selection screen C&T 68554 should be selected
You can't detect the number of buttons reliably on a ps/2 connected device.