Re: Monitor's EDID not recognised

[Jeremy Murphy <jeremy.william.murphy-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

On Sat, 8 Mar 2008 01:08:27 am Jean Delvare wrote:
>
> BTW, note that you should NOT access the nvidia I2C buses created by
> the binary nvidia X11 driver while not under X.

OK, thanks.  I did look for them outside of X, but they weren't there.


> OK. Two more things you can try:
>
> * Get rid of the binary nvidia driver for a moment, and try the
> nvidiafb driver. If it gets better, it suggests that the binary nvidia
> driver is at fault. If you get the same noise, it has to be a hardware
> issue.

There are no nVidia I2C buses visible with the nvidiafb driver, i2cdetect 
reports only the SMBus.  Here's a snippet from the X log, though:

(II) Loading sub module "i2c"
(II) LoadModule: "i2c"(II) Module already built-in
(II) Loading sub module "ddc"
(II) LoadModule: "ddc"(II) Module already built-in
(II) NV(0): I2C bus "DDC" initialized.
(II) NV(0): Probing for analog device on output A...
(--) NV(0):   ...found one
(II) NV(0): Probing for analog device on output B...
(--) NV(0):   ...can't find one
(II) NV(0): Probing for EDID on I2C bus A...
(II) NV(0): I2C device "DDC:ddc2" registered at address 0xA0.
(II) NV(0): I2C device "DDC:ddc2" removed.
(II) NV(0):   ... none found
(II) NV(0): Probing for EDID on I2C bus B...
(II) NV(0): I2C device "DDC:ddc2" registered at address 0xA0.
(II) NV(0): I2C device "DDC:ddc2" removed.
(II) NV(0):   ... none found
(--) NV(0): CRTC 0 appears to have a CRT attached
(II) NV(0): Using CRT on CRTC 0

Address 0xA0?  Should that be 0x50?  


> * Did you try another video cable? The I2C bus signal is carried over 2
> dedicated pins on the VGA connector (12 and 15), if your cable happens
> to not have them wired properly for some reason, this could explain
> your problem.

OK, I'll have to ask around for one.  Thanks for your help.

Jeremy

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