Linux framebuffer for 15 kHz arcade monitor!?

Hello guys! I need a big help for now!
I´m customizing my 15 kHz cabinet with MandrakeLinux 2005 LE, framebuffer
support and advmame 0.97. Everything is ok, except setuping video
 resolutions with ADVCFG utility. When I use these configurations:

pclock = 5-100
hclock = 15.75
vclock = 50-60

I can get only a horizontal half-screen (like vertical games). When I tried
to increase the size (I key), the video lose syncronism. So, I tried to
 increase the pclock with 10 or 12 value, but ADVCFG utility says
"calibration mode unsupported. The video mode is incompatible with the
 monitor limitations!". With SVGALIB, it´s possible to use these pclocks,
 but I think it´s missing some configuration for framebuffer. Maybe is
necessary to include some video modes on the /etc/fb.modes file?

My current video system:

64 MB Geforce 4 MX Integrated running with RIVA FRAMEBUFFER

 Please, if somebody knows how to solve this problem, HELP ME!

 Keep mailing

 Gore Daimon 



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