Unable to detect display on a minimal distro install, works with a DE

[stephvnm]

Hello,

I've been distrohopping lately and ran into an issue with ddcutil. I'm currently running a minimal Debian install with a window manager and ddcutil is unable to detect my display.

$ ddcutil detect 
No displays found. 
Is DDC/CI enabled in the monitor's on screen display? 
Run "ddcutil environment" to check for system configuration problems.

Same thing happened on an Arch install (without a DE). I'm pretty sure it's a system configuration issue since it work absolutely fine on a Xubuntu, Kubuntu, etc. installs. I ran ddcutil environment --verbose and tried debugging on my own but was unsuccessfull.

Any help is appreciated.

More info: i2c-3 should be the relevant one GPU driver is the legacy nvidia-390 (ddcutil worked in a DE without the special nvidia settings applied)

Output of ddcutil environment --verbose

[rockowitz]

I suspect this is the same problem as #278. What happens if you build ddcutil from branch 1.2.2-release?

[stephvnm]

Hey, thanks for the quick reply !

Building from 1.2.2-release does indeed work !

$ ddcutil detect
Display 1
   I2C bus:  /dev/i2c-3
   EDID synopsis:
      Mfg id:               DEL
      Model:                DELL P2719HC
      Product code:         16776
      Serial number:        96VMSS2
      Binary serial number: 875968599 (0x34363857)
      Manufacture year:     2019,  Week: 46
   VCP version:         2.1

Thank you !

What do you suspect the issue is? Older nvidia card incompatible with newer version ? Let me know if I can help with something!