Re: Rivafb won't work with DVI connector

["Antonino A. Daplas" <adaplas@hotpop.com>]

On Friday 19 November 2004 19:37, Andrew Walrond wrote:
> 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.

You can try the following:

1. turn on verbose debug output in drivers/video/fbmon.c

2. Try just grabbing the EDID from BUS2, since the EDID checksum failed from
BUS3.

3. if you can, send me your EDID block.  You can use the utility 'read-edid'. 

Tony




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