-4

[[ De-Escalated Quickly ! OK , I will try to edit it so that my intent is clear ]]

According to this Post , we can use "Dummy" Hardware to make a fake Display.
Such fake Hardware are used in cases where (1) the PC will refuse to Start without attached Displays.
Essentially, (2) we are "tricking" the PC into thinking that there is a Display.

This is all fine. Headless PCs are useful. RDP & VNC can run without Displays connected. Some third Party manufacturers have taken the chance to make fake Displays.

But, (A) why should there be such a requirement of a Display from the PC (or OS) manufacturer ?
In case it is really absolutely necessary, (B) why should it be so easy to circumvent ?

(A) Let us say, it is Mandatory to have a Display (eg troubleshooting or setting the size of resolution) then
(2A) Still, troubleshooting info can be put in text output [[ log file or over network ]]
(2B) User can be given a choice to run without Display by some config file which says [[ -Display=None -res=1024x768 ]]
Then in fact , it is not really Mandatory.

Using Analogy 1, when we ssh to a linux machine to execute certain commands, we might get "stdin: is not a tty" which is "requirement". Still user has the choice to use ssh -t to over-ride that requirement. We should not look to third Party manufacturers to make some fake tty Hardware or Software ( oh , this is just to explain , I know it is not Possible ! )
Here tty is a requirement but not Mandatory.

Using Analogy 2, if OS has Mandatory minimum requirement of 500GB Disk + 32GB ram, it is because the OS installation will require that much Disk Space & OS will run-time require that much ram.
During Installation, OS can check this & exit if necessary.
If we circumvent using some 100GB Disk which reports 500GB Size, Installation is going to ultimately fail.
If we circumvent using some 16GB ram which reports 32GB Size, run-time is going to ultimately fail or crash.
Here it is a Mandatory minimum requirement of 500GB Disk + 32GB ram.

In case we can do without Display, why is the PC or OS checking it ?
In case we can not do without Display, how can the fake Hardware work ?

It case it is really Mandatory, then the fake Hardware would not work. If OS manufacturer thought it was really Mandatory , then it should be made un-circumvent-able.

Prem
  • 1,340

1 Answers1

0

A typical case for a fake display card is that of a headless computer (no display) that one wants to use remotely by VNC or RDP.

Such software relies on sharing the computer's screen, so can't work without a display. This fake makes it possible. There are other cases.

If someone is manufacturing it, it's only because people are buying it, which means that there is a need for it.

harrymc
  • 498,455