No recognition of DVI-D monitor

Submitted by Wolfgang

Assigned to Nouveau Project

Link to original bug (#108047)

Description

Created attachment 141717
vbios.rom

Hello,

I try to get my external monitor to work with my laptop. But there is no signal at the DVI output. Internal LVDS-1 works like expected.

I tried
an other monitor,
an other DVI-(dualchannel)-cable,
HDMI output direct at the laptop.
Monitor(s) keep on saying "no signal".

Forcing kms video=DVI-D-1:e => DVI-D-1 on with 1024x786
Forcing kms video=DVI-D-1:1600x1200e =>
DVI-D-1 on 1600x1200 but my monitor has 1920x1200 native resolution
Forcing kms video=DVI-D-1:1920x1200e =>
DVI-D-1 on picture is 1920x1200 but monitor
reports 960x1200 and picture is pixelated


I'm on Ubuntu 18.04,
Device is a HP Elitebook8730w with docking station and DVI-D output.

As I saw, with the help of Ilia Mirkin from your team, there is no EDID data reported in Xorg.log at DVI-D-1 (equal if forced kms or default boot)

There is a message "mxm: unmatched output device" in dmesg but it is also there
when boot with unplugged DVI monitor. Ilia adviced me to add vbios.rom, to check this.
/sys/class/drm/card0-DVI-D-1/edid is empty
/sys/class/drm/card0-LVDS-1/edid has data

Adding dmesg and Xorg.log with plugged and unplugged DVI, both without kms forcing.

Thank you, Wolfgang

Attachment 141717, "vbios.rom":
vbios.rom_DVI_plugged