Hi, I don't quite know what I'm asking, I'm just fishing for responses :)

I got a Matrox DualHead2Go which splits a vga signal across multiple monitors. Atm. I have it driving two screen with a duplicated image but if you supply it one of these modes :

edid 2048x76...@60hz
       clock=113.75
       shb=2136 ehb=2200 ht=2352
       vrs=771 vre=786 vt=806
       hsync=+ vsync=-
edid 2048x76...@75hz
       clock=137.81
       shb=2120 ehb=2176 ht=2296
       vrs=769 vre=784 vt=800
       hsync=+ vsync=-
edid 2560x102...@60hz
       clock=189.82
       shb=2608 ehb=2720 ht=2968
       vrs=1025 vre=1037 vt=1066
       hsync=+ vsync=-
edid 2048x76...@85hz
       clock=165.39
       shb=2160 ehb=2232 ht=2408
       vrs=769 vre=781 vt=808
       hsync=- vsync=-


It will become two distinct screens, half on each monitor.
You can see form my Vesa mode dump that we don't have that in the list. My nvidia card (8600 GT dual SLI) is aslo unrecognised by the vganvida.c
pci | grep vid
3.0.0: vid 03.00.00 10de/0402 10 0:f9000000 16777216 1:c000000c 268435456 2:00000000 16 3:f6000004 33554432 4:00000000 16 5:0000cc01 128 4.0.0: vid 03.00.00 10de/0402 10 0:fd000000 16777216 1:d000000c 268435456 2:00000000 16 3:fa000004 33554432 4:00000000 16 5:0000dc01 128




edid mfr            MTX
edid serialstr edid name edid product 768
edid serial         1363750341
edid version        1.3
edid mfrdate        2007.44
edid size (cm)      41x31
edid gamma          2.21
edid vert (Hz)      0-0
edid horz (Hz)      0-0
edid pclkmax        0
edid flags           standby suspend activeoff
edid 640x48...@60hz
       clock=25.175
       shb=648 ehb=792 ht=800
       vrs=490 vre=492 vt=525
       hsync=- vsync=-
edid 640x48...@75hz
       clock=31.5
       shb=640 ehb=840 ht=840
       vrs=481 vre=484 vt=500
       hsync=- vsync=-
edid 800x60...@60hz
       clock=40
       shb=800 ehb=1056 ht=1056
       vrs=601 vre=605 vt=628
       hsync=+ vsync=+
edid 800x60...@75hz
       clock=49.5
       shb=800 ehb=1056 ht=1056
       vrs=601 vre=604 vt=625
       hsync=+ vsync=+
edid 1024x76...@60hz
       clock=65
       shb=1024 ehb=1344 ht=1344
       vrs=771 vre=777 vt=806
       hsync=- vsync=-
edid 1024x76...@75hz
       clock=78.75
       shb=1024 ehb=1312 ht=1312
       vrs=769 vre=772 vt=800
       hsync=+ vsync=+
edid 1280x102...@75hz
       clock=135
       shb=1280 ehb=1688 ht=1688
       vrs=1025 vre=1028 vt=1066
       hsync=+ vsync=+
edid 2048x76...@60hz
       clock=113.75
       shb=2136 ehb=2200 ht=2352
       vrs=771 vre=786 vt=806
       hsync=+ vsync=-
edid 2048x76...@75hz
       clock=137.81
       shb=2120 ehb=2176 ht=2296
       vrs=769 vre=784 vt=800
       hsync=+ vsync=-
edid 2560x102...@60hz
       clock=189.82
       shb=2608 ehb=2720 ht=2968
       vrs=1025 vre=1037 vt=1066
       hsync=+ vsync=-
edid 2048x76...@85hz
       clock=165.39
       shb=2160 ehb=2232 ht=2408
       vrs=769 vre=781 vt=808
       hsync=- vsync=-


vesa flag            Ulinear|Hlinear
vesa sig            VESA 3.0
vesa oem            NVIDIA 96.132
vesa vendor         NVIDIA Corporation
vesa product vesa rev vesa cap 8-bit-dac
vesa mem            14680064
vesa mode           0x100 640x400x8 m8 packed
vesa mode           0x101 640x480x8 m8 packed
vesa mode           0x102 800x600x4 m4 planar
vesa mode           0x103 800x600x8 m8 packed
vesa mode           0x104 1024x768x4 m4 planar
vesa mode           0x105 1024x768x8 m8 packed
vesa mode           0x106 1280x1024x4 m4 planar
vesa mode           0x107 1280x1024x8 m8 packed
vesa mode           0x10e 320x200x16 r5g6b5 direct
vesa mode           0x10f 320x200x32 x8r8g8b8 direct
vesa mode           0x111 640x480x16 r5g6b5 direct
vesa mode           0x112 640x480x32 x8r8g8b8 direct
vesa mode           0x114 800x600x16 r5g6b5 direct
vesa mode           0x115 800x600x32 x8r8g8b8 direct
vesa mode           0x117 1024x768x16 r5g6b5 direct
vesa mode           0x118 1024x768x32 x8r8g8b8 direct
vesa mode           0x11a 1280x1024x16 r5g6b5 direct
vesa mode           0x11b 1280x1024x32 x8r8g8b8 direct
vesa mode           0x130 320x200x8 m8 packed
vesa mode           0x131 320x400x8 m8 packed
vesa mode           0x132 320x400x16 r5g6b5 direct
vesa mode           0x133 320x400x32 x8r8g8b8 direct
vesa mode           0x134 320x240x8 m8 packed
vesa mode           0x135 320x240x16 r5g6b5 direct
vesa mode           0x136 320x240x32 x8r8g8b8 direct
vesa mode           0x13d 640x400x16 r5g6b5 direct
vesa mode           0x13e 640x400x32 x8r8g8b8 direct
vesa mode           0x145 1600x1200x8 m8 packed
vesa mode           0x146 1600x1200x16 r5g6b5 direct
vesa mode           0x14a 1600x1200x32 x8r8g8b8 direct
vesa mode           0x147 1400x1050x8 m8 packed (unoffered)
vesa mode           0x148 1400x1050x16 r5g6b5 direct (unoffered)
vesa mode           0x149 1400x1050x32 x8r8g8b8 direct (unoffered)
vesa mode           0x152 2048x1536x32 x8r8g8b8 direct (unoffered)
vesa mode           0x160 1280x800x8 m8 packed (unoffered)
vesa mode           0x161 1280x800x32 x8r8g8b8 direct (unoffered)
vesa mode           0x162 768x480x8 m8 packed (unoffered)
vesa mode           0x164 1440x900x8 m8 packed (unoffered)
vesa mode           0x165 1440x900x32 x8r8g8b8 direct (unoffered)
vesa mode           0x168 1680x1050x8 m8 packed (unoffered)
vesa mode           0x169 1680x1050x32 x8r8g8b8 direct (unoffered)
vesa mode           0x17c 1920x1200x8 m8 packed (unoffered)
vesa mode           0x17d 1920x1200x32 x8r8g8b8 direct (unoffered)


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