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Refresh rate control on new nVidia VGA is messed up,anyidea? (Miscellaneous)

posted by RayeR(R) Homepage, CZ, 06.10.2007, 23:36

I'm nVidia user for a long time because they provide VGA with VESA VBE 3.0 which include standard for setting up a refresh rate via CRTC vhen calling videomode bios init routine. This allows me to use Vbehz or Unirefresh TSR to see all programs in nice 85Hz.

It worked nice for nV from TNT to GeForce 4 I had tested but for newer 5xxx/6xxx/7xxx/8xxx models it doesn't longer work (60Hz only). But nvidia still claims VBE 3.0 - this violate the standard, it's effectively 2.0 now.
Someone guessed that nvidia disabled it to prevent angry stupid LCD users questions when they set more Hz to their poor LCDs.

Any idea how to set higher rates?
Maybe there are 2 ways
1) analyze nvidia bios if there's some disabled code and do some modding.
2) write own refresh control tool -
I think it is possible because windows drivers already can set it. And even Scitech SNAP SDK VBE test program using nucleus nvidia driver also can set it under pure DOS. But it's very hard to start write something because I cannot find any HW docs for nvidia chips :( I tried contact nV and Scitech but no reply.

DOS gives me freedom to unlimited HW access.


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