Specifying positive hsync and vsync in XF86Config file ?

From: zack (news_at_zoccoz.com)
Date: 10/29/03

Date: Wed, 29 Oct 2003 16:18:54 GMT

I'm trying to get X to use positive sync polarities. This makes
switching computers with a KVM much faster when both computers use
+Hsync and +Vsync.

How do I do this without using a full modeline? I'm pretty sure I've
just specified +hsync and +vsync somewhere before, and it worked. I
cannot remember what it was I did though..