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This patch was added in order to avoid bug #1076728 but causes issues of its own (rhbz #1098647). Once QEMU gets vgamem_mb support (rhbz #1098647), it can be removed.

(In reply to Christophe Fergeau from comment #0)
> Once QEMU gets vgamem_mb support (rhbz #1098647)
-> I meant rhbz#1053039

follow dep POST state

*** This bug has been marked as a duplicate of bug 1098647 ***

Did they try setting the vgamem/ram/vram libvirt/qemu parameters to some higher value (I believe vgamem is the right one)? To correctly handle 2 1920x1200 monitors, this needs to be 32MB (the default is 16MB and is not enough).