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i compiled the kernel with default options + some VIA codes for my audio & ethernet cards. should it be compiled with "mouse" support or mouse support comes built-in?

Yes, compile in mouse support and make sure you choose PS/2 mouse support in the sub menu. Also you'll want the event interface (in the same section as mouse support).

yep, i compiled Linux Kernel for Gentoo & used the same options there & mouse is working . -- arnuld http://arnuld.blogspot.com/