Dual-Card Mult-head confusion

Before I begin I want to say this because I know SOMEONE is going to think that it is some
sort of useful answer: I have already googled for this, I found several matches that did
NOT help, every one of them was relevent to what I'm trying to do, but not to fixing it.
So Google is NOT my friend.

There, now:

I've got 2 graphics cards installed on a Debian Sid system with a nice up-to-date xorg 6.9
setup, running KDM as the login.

GC1 = Radeon 7000 on 1:0:0
GC2 = Diamond S540 on 0:10:0

What I can't do is get X to work with both screens.
Configuring according to all Walkthroughs, FAQs, etc... have lead to at best this:
Device setup for each card.
Display, etc.. set up for each card.

ServerLayout
<usual stuff>
Screen 0 "GC1" 0 0
Screen "GC2" LeftOf "GC1"
<stuff about mouse and kybd>

variations tried were screen 0 "gc1"
screen 1 "gc2"

leaving the all the numbers off, and various permutaions of that. I don't THINK i've
missed any, but after about 6 hours of this I MIGHT have missed something.

Basically what happens in any config execpt
screen "gc1"
screen "gc2"
is that GC2 will click on, and then it will shift from TTY1 to X on GC1, and then the
whole system crashes... big time.
The exception just leaves it a single headed system on GC1 (or if I move GC2 up then on
that one, either way)

Driver sections are straight forward:
Section
cardid
driver "radeon"/"savage"
busid PCI 1:0:0 and 0:10:0
end section

Setup for the monitors same type of thing:
Id Monitor "Princeton"/"MAG"
HSync whatever/whatever
Vrefresh ditto
option "DPMS"
end

copied and pasted a lot actually because the 2 monitors have virtually the same capacity
(one does 1024x768x24@85hz the other @75 is all)

Any bright ideas?

PS I truncated so much of what's in the xorg.conf because it's 99% stuff that debconf
generated duplicated for the 2 cards and monitors and then set to the specific numbers/
options.

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