Rivafb won't work with DVI connector

[Andrew Walrond <andrew@walrond.org>]

I have a TFT LCD screen (1600x1200) with both D-Sub and DVI inputs, and a NV25 
[GeForce4 Ti 4600] with same outputs.

Using the old D-Sub cable works fine:

 rivafb: nVidia device/chipset 10DE0250
 rivafb: nVidia Corporation NV25 [GeForce4 Ti 4600]
 rivafb: Detected CRTC controller 0 being used
 rivafb: RIVA MTRR set to ON
 rivafb: Found EDID Block from BUS 2
 rivafb: setting virtual Y resolution to 83886
 Console: switching to colour frame buffer device 200x75
 rivafb: PCI nVidia NV25 framebuffer ver 0.9.5b (128MB @ 0xE0000000)

but with the DVI cable (dsub disconnected) I get a blank screen as soon as 
rivafb takes over:

 rivafb: nVidia device/chipset 10DE0250
 rivafb: nVidia Corporation NV25 [GeForce4 Ti 4600]
 rivafb: Detected CRTC controller 0 being used
 rivafb: RIVA MTRR set to ON
 rivafb: Found EDID Block from BUS 3
 EDID checksum failed, aborting
 rivafb: setting virtual Y resolution to 209715
 Console: switching to colour frame buffer device 80x30
 rivafb: PCI nVidia NV25 framebuffer ver 0.9.5b (128MB @ 0xE0000000)

I then have to plug the d-sub back in to see the output.
[side note: 2.6.8.1 shows only garbage on reconnecting dsub, so rc2 is an 
improvement.]

No I don't understand the lingo here, but I assume EDID/BUS2/BUS3 and the 
checksum failure are the bits I'm interested in here.

I'm willing to do the grunt work to get this fixed, but can you guys give me a 
heads up on how this stuff works, and what might be involved in a fix?

Thanks

Andrew Walrond


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