In my rack I currently have an Unraid server and an Opensense router running on their own hardware.

 

I am looking for a KVM switch that would work for switching a mouse, monitor and keyboard that I have installed next to the rack between the systems.  I am hoping it would be one that would allow all 3 to work even during the bootup process to be able to access BIOS for any of the connected systems.

 

It would also be nice if it had 3 total inputs so I have room for a spare if I need to troubleshoot other systems without needing to disconnect my main 2 machines.  I currently have a VGA KVM, but it doesn't seem to work with Unraid.  At least nothing comes up on the screen, albeit I am needing to use a VGA to DVI to Displayport adapter because the video card in the Unraid system does not have VGA out capability, so maybe that is the problem?

 

Anyway, thanks in advance!

There are rather cheap ( <7€) adapters for HDMI->VGA available, see:

https://www.amazon.de/Vergoldete-HDMI-auf-VGA-Adapter-Projektor-Chromebook-Raspberry-schwarz/dp/B075GZ8DX7/ref=sr_1_1?crid=JGOXAI2QMHLB&dib=eyJ2IjoiMSJ9.ovs5zPjBcXIwkVR1ncNSATcFPEaa3L1_Lskhbzh7dnAexI0BB9WUmcqmNhZFCoKqUM5JVv8IuukkJtJrpHKZuaDMaSQm-iogvfum2xGidEriqbYKSX7xpLvQd4gLHqKP0wxRNhWhIim4mRNId1dR2YqOEv5hUv2ULPHXvHwYVD3B_5DIR-ZQP_qD5Y4TjxOnzHauAXjr2yJoJTHxlsrHrylqme84aR6ykQazLVBH3Iw.I1MUCE5hHpnJIUFwtaUuB7tRi2eReIs4oOwvgjQEFAo&dib_tag=se&keywords=adapter+hdmi+auf+vga&qid=1717645528&sprefix=adapter+hd%2Caps%2C73&sr=8-1

 

Or (even cheaper) Displayport -> VGA:

https://www.amazon.de/NIAGUOJI-vergoldeter-DP-auf-VGA-Adapter-Stecker-kompatibel/dp/B08J7NJ8G7/ref=sr_1_1?__mk_de_DE=ÅMÅŽÕÑ&crid=2Y7J1AYSA7X84&dib=eyJ2IjoiMSJ9.sx4Vu46Gqi9gxio55MwwHOfReAZ4AdRycJ3xrg-MHrPYJh0KQabeUxmJ3-uIOPu3ng5KWkXg9rNGbURtoJZWHUxLfdWqWH9cO1FO5pFu1qGfAxPe122ZH0Un48ewfuUiSn5Z5ljqalFuxygv0QP_FO8PobtQvSjTfSO7YjBvi6TwpVOy6cAe6L823Tt--oZowcnSTfRpEhXubQ-IydiVus1QHH9bw4ZxhFuXX4c0Q8g.kgLSWtLklXCUzt_XmbLIa3BXJP9rRco6g2S9K3Bbm70&dib_tag=se&keywords=adapter+displayport+auf+vga&qid=1717645762&sprefix=adapter+displayport+auf+vga%2Caps%2C74&sr=8-1

 

The "trick" is that these adapters tell the attached computer that the screen is limited to 1024x768.

Usually BIOS and OS's read the capabilities of the attached monitor and select the highest possible screensize. During boot time you have no influence to limit it to VGA regions. Thats why you only see a blank screen now.

 

(Picture quality of these adapters is not the best, but its good enough for bios and console stuff)