i965G (Asus P5B-V): Diagnosing ADD2/SDVO issues

Keith Packard keithp at keithp.com
Wed Feb 28 09:49:03 PST 2007

On Wed, 2007-02-28 at 16:23 +0100, Rene Wagner wrote:

> Now, I get a signal on the DVI port for a few seconds after switching
> the computer on. Then it just dies. The intel driver shows that an
> SDVO adapter is present in the register dump, but then fails to
> recognize a device (log using a git build as of last night attached).

The driver sees the SDVO channel on the chip as it does with all
hardware that has SDVO, but it can't detect anything on the line with
I2C, which seems to strongly indicate that the card and the motherboard
aren't talking.

That the BIOS also fails to initialize the SDVO link is another
indication that the card isn't compatible with the motherboard; the BIOS
should auto-detect and configure the card.

> Does anyone have any recommendations how to diagnose the problem? Is
> this a case of incompatible hardware, a broken BIOS, or is the hardware
> just faulty? Reports of any other ADD2/SDVO cards working with the
> Asus P5B-V board would also be appreciated.

I haven't tried this board; do you know if it uses ADD2-R cards instead
of the ADD2-N card? The difference is that with ADD2-R cards the SDVO
channels are reversed and it uses the other end of the PCI-E x16 bus.
When I plug the wrong kind of ADD2 card into my motherboards, the
machine refuses to POST though.

keith.packard at intel.com
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