It works, but I had to enforce the SVDO-detection in xorg.conf via
Option "ForceSDVODetect" "true"
to get dual-head working.
Output of sudo lspci -vnn:
00:02.0 VGA compatible controller [0300]: Intel Corporation 4 Series Chipset
Integrated Graphics Controller [8086:2e12] (rev 03)
Subsystem: Fujitsu Siemens Computers Device [1734:114c]
Flags: bus master, fast devsel, latency 0, IRQ 2298
Memory at fc000000 (64-bit, non-prefetchable) [size=4M]
Memory at e0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 1c70 [size=8]
Capabilities: [90] Message Signalled Interrupts: Mask- 64bit- Queue=0/0
Enable+
Capabilities: [d0] Power Management version 2
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[G33] xserver-xorg-video-intel: TMDS-2 not discovered on dual-DVI ADD2 card
https://bugs.launchpad.net/bugs/336765
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