[Nouveau] Problem setting refresh rate on 8400GS

[Donald Jenkins]

Hello.
Having serious problems with all nvidia boards plugged on my PC, now on
8400GS.
Xorg with 2D-only nouveau driver sets invalid preferred refresh rate 60hz on
SAMTRON 73v, when 75hz needed.
output of xrandr:

Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 8192 x 8192
DVI-I-1 disconnected (normal left inverted right x axis y axis)
VGA-1 connected 1280x1024+0+0 (normal left inverted right x axis y axis)
338mm x 270mm
   1280x1024      60.0*+   75.0
   1152x864       75.0
   1024x768       75.1     70.1     60.0
   832x624        74.6
   800x600        72.2     75.0     60.3     56.2
   640x480        72.8     75.0     66.7     60.0
   720x400        70.1

I can *manually* set correct refresh rate using xrandr -r 75 command (for
example, in .xinitrc), but Xorg configuration don't recognize it at all.
Some full screen software games reset refresh rate back to 60hz.
How I can "hardcode" it in xorg.conf? I really stuck at this point.
Thanks.
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