[Nouveau] [Bug 108047] No recognition of DVI-D monitor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108047

--- Comment #10 from Wolfgang <wolle321 at freenet.de> ---
Finally I got a workaround, with a lot of pain.
The problem, that Nouveau doesnt find my connected DVI-display still persists.

I tried to load a custom EDID-file from /lib/firmware/edid/.
This failed, it seems that the driver doesnt load EDID for "not connected"
displays. Forcing enabled DVI-D-1 didnt help too, I think the display is
enabled to late. But for those, who want to fix wrong EDID-Data this wight
work:

The kms-parameter was on older kernels:
drm_kms_helper.edid_firmware=edid/your_custom_edid.bin
actually with newer kernels it is 
drm.edid_firmware=edid/your_custom_edid.bin

But the idea was not so bad: how to get correct EDID-data for my DVI-monitor:
I installed nvidia-driver (which freezes after 20 min but detects the monitior
out of the box).
The same thing like under nouveau: only the LVDS-monitor EDID is found with
get-edid, but xrandr --verbose showed me the EDID of the DVI-Monitor (why?
thanks you xrandr!).
I wrote the EDID in a Hex-editor and parsed it with parse-edid. So I got the
definitely working modeline for 1920x1200 for my DVI-Monitor.
(It looks different from cvt-generated one, and I think the kernel uses the
same algorithm, when I force the resolution with kms video=DVI-D-1:1920x1200e,
which produced the 960x1200 monitor resolution with the 1920x1200 desktop
resolution behind).

So the final workaround back on nouveau is: 
1.booting with video=DVI-D-1:e and starting up with 1024x768 kernel default
resolution. 
1.1 Also add a grub entry without enabling the DVI port because the LVDS doesnt
show the LightDM login dialog, when DVI is forced enabled but not plugged in.
2.When logging in calling a script, what creates, adds and calls the right
modline (stolen from nvidia-driver) for my DVI-display.

Not very nice, but works. 
Could you explain, why nouveu doesnt detect the DVI-monitor, but nvidia does?
Is this a bug?

Thanks to Ilia Mirkin, who how gave me some hints.

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