Re: FreeBSD/X11: Howto revive DisplayPort?

HI

    Yes I  have  same experience.

    I beleive its because the  DDC/ EDID   info sent from screen over  
the  connection cable
    is  lost  if  the  KVM  and screen is not connected to the computer 
at start up.
     If I make sure that  the screen is attached to  the computer when 
the computer powers up
      a  Usable resoultion/timing is selected by the graphics card.

   Regards.


Den 2025-11-26 kl. 16:37, skrev FreeBSD User:
> Using FreeBSD CURREN and FreeBSD STABLE/15.
> Also, most systems are attached to a KVM switch, connected via DP.
>
> Hosts booting all UEFI.
>
> On hosts using X11/xdm GUI, switching forth and back to the output/host I want to use
> DP does obviously not "lose" DP output, so after graphics has been initialized I'm able
> to see the GUI.
>
> The situation is completely different with plain consoles, provided by FreeBSD's EFI/UEFI
> simple framebuffer device driver. Working on the console on one host, switching to
> another host, working there and trying to switch back leaves me with no output anymore! I
> see this behaviour with different types of KVM switches I have at hand.
>
> Can this behaviour be changed, even with no X11?
>
> Thanks in advance and wishes,
>
> O. Hartmann
>
-- 
-------------------------
Lars Tunkrans
Oracle SPARC/Solaris System Administrator
Fujitsu M12 SPARC Specilaist