Comment # 10
on bug 108047
from Wolfgang
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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