It's a "standard" geometry, see table inside section 5.3:
http://debian.mcc.ac.uk/non-debian/Howtos/Framebuffer-HOWTO-5.html
with a whole column just for 1152x864.
It's missing from grml's X configuration scripts:
grep "1152x864" /etc/X11/xorg.conf.example
grep "1152x864" /usr/bin/grml-x
grml of course has the other geometries:
grep "1024x768" /etc/X11/xorg.conf.example
grep "1024x768" /usr/bin/grml-x
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