To run a Linux virtual machine with a non-standard resolution do the following:
gtf <width> <height> <refresh>
Note. Refresh need not to be more than 60.
Monitor
" section of xorg.conf.Display
" of section "Screen
" and begins with the "Modes
" keyword.Note. Make sure, that "Depth
" property of the subsection "Display
" equals to "DefaultDepth
" value defined in section "Screen
".