Genesys zu Out-of-Box demo's - DP-bist ERROR- Displayport

[vcb1]

Hi,

I am working with the demo for the genesys zu board (https://github.com/Digilent/Genesys-ZU/tree/5ev/oob/master?_ga=2.30403711.1708251486.1649661649-317001971.1647265744) and i have an error to display a pattern in a monitor.

I am wondering if it is just a matter of the type of display port connector. In other words if i need an active mini display port.

I am trying the DP-bist command to test the displayport but i get this error.

root@GenesysZU:~# DP-bist
failed to find mode "1920x1080" for connector 42
failed to create dumb buffer: Invalid argument

When i test with modtest, looks like the display port is disconected.

root@GenesysZU:~# modetest  -   -M     -M xlnx
Encoders:
id    crtc    type    possible crtcs    possible clones    
41    0    TMDS    0x00000001    0x00000000

Connectors:
id    encoder    status        name        size (mm)    modes    encoders
42    0    disconnected    DP-1               0x0        0    41
  props:
    1 EDID:
        flags: immutable blob
        blobs:

        value:
    2 DPMS:
        flags: enum
        enums: On=0 Standby=1 Suspend=2 Off=3
        value: 3
    5 link-status:
        flags: enum
        enums: Good=0 Bad=1
        value: 0
    6 non-desktop:
        flags: immutable range
        values: 0 1
        value: 0
    4 TILE:
        flags: immutable blob
        blobs:

        value:
    20 CRTC_ID:
        flags: object
        value: 0
    43 sync:
        flags: range
        values: 0 1
        value: 0
    44 bpc:
        flags: enum
        enums: 6BPC=6 8BPC=8 10BPC=10 12BPC=12
        value: 8

 

In the readme i see that there is no information regarding the type of display port: "To successfully run the Display Port test, an Display port capable monitor is required, as well as one Display Port cable"

Is it possible that i need an active display port?

Thanks,

 

 

 

 

[Chris2000]

I'm having the same issue. 
I'm using a mini-DP to HDMI cable to connect the Genesys board to my monitor.

root@GenesysZU:/usr/bin# DP-bist -v
Encoders:
id    crtc    type    possible crtcs    possible clones    
41    0    TMDS    0x00000001    0x00000000

Connectors:
id    encoder    status        name        size (mm)    modes    encoders
42    0    disconnected    DP-1               0x0        0    41
...

failed to find mode "1920x1080" for connector 42
failed to create dumb buffer: Invalid argument

 

[vcb1]

Hi @Chris2000

Did you try with an active mini-DP to HDMI cable ? I still do not have it so i  can not try it (my cable is passive). This should be our first test.

The second one is to be sure that the native resolution of the monitor is "1920x1080".

Please let me know if you solve that issue.

 

 

[Chris2000]

@vcb1I got a mini-DP to regular DP cable and it does work.  The PetaLinux console shows on the DP port at bootup and running DP-bist shows a test pattern. 

I assume an active cable that converts DP to HDMI protocol would work. 

I had tried a passive DP to HDMI cable, but after a bit of research I found that for this to work the DP source must be dual-mode/DP++, which means it can generate HDMI signals if it detects an HDMI cable.  The Genesys board doesn't seem to have this capability. 

Good luck!

[vcb1]

Thanks for the info @Chris2000!  I will check it a  mini-DP to regular DP cable.

[elodg]

The mini-DP connector on the Genesys ZU is not a Dual-mode DisplayPort (DP++). In other words, it does not send DVI/HDMI signals, that a passive adapter cable could wire into a DVI/HDMI Sink. Use mini-DP to DP cables.