[Bug 108047] New: No recognition of DVI-D monitor

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

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

            Bug ID: 108047
           Summary: No recognition of DVI-D monitor
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: wolle321-KuiJ5kEpwI6ELgA04lAiVw@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Created attachment 141717
  --> https://bugs.freedesktop.org/attachment.cgi?id=141717&action=edit
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

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