No boot with Debian 12 & 3CX v20 on Headless MiniPC

[drscoot]

Recently I moved my 3CX setup to a mini PC with Debian 10 and upgraded to Debian 12.
All works fine, untill the hdmi monitor is disconnected for headless use. Then the miniPC no longer fully boots.
I tried some grub conf settings like I found in this post: https://shaunfreeman.name/gigabyte-...ting-without-monitor-on-ubuntu-minimal-16-04/
Enabeling the console line didn't change anything. I didn't dare to change the 2 lines with 'CMDLINE_LINUX' from this post, because 1 line seems to contain some 'threecx'-speciific data.
I also looked in the bios for some settings like 'headless boot', or 'don't halt on errors' but there aren't non.
The miniPC is based on Intel J1900 8G ram 128G SSD. I saw it working before headless, with older version of linux I think Debian 9.
Any idea's why it won't work here? Of course I can order such a dummy hdmi connector to simulate a monitor but still.

 

[OlegR_3CX]

@drscoot
Hi there.
A very strange issue there and not sure how you could debug that. Maybe you could try another Debian community forum, as this is such a rare issue that you faced and specific to hardware.
I assume that you at least have access via SSH, so the Phonesystem can be accessible there and function as expected.