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Black Screen on Secondary

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Black Screen on Secondary

from Stardock Forums

I am using KVM mode and when I connect to a secondary machine I get a black screen and no response.  ctrl-alt-del and ctrl-alt-backspace don't work.  If I have a monitor hooked up directly to the secondary, everything appears fine there and the machine is not in a locked state.  I've checked the firewalls, and it is turned off.

 

This had been working fine before and the black screen issue only appeared after a Windows 10 update from this week, but I can't be sure if that was the cause of it.

multiplicity
86,391 views 31 replies
Reply #26 from Stardock Forums Top

Quoting fedeberge6502, reply 23

On Reply #13 you mention the issue was resolved by forcing the PC to use a specific video card.

On which PC? Do ia have to force KVM to use the video card?
End of fedeberge6502's quote

The Secondary you are KVM'ing to.

Sean Drohan
Stardock Product Lifecycle Manager

Reply #27 from Stardock Forums Top

Hi Sean,

I had the same issue. My Secondary PC is a laptop so it has one built-in monitor and not plugged into other monitors. And the built-in monitor is awake. When I KVM the Secondary PC on the Primary, I got black screen. The keyboard works fine for the Secondary PC.

The Secondary PC does have 2 graphics chips. I tried the step "How do we set the default GPU (system-wide)"from here: https://www.itechtics.com/use-specific-gpu , which I assume force every application to use the Nvidia GPU, including Multiplicity. Unfortunately it doesn't work. Any other ideas?

The Political Machine 2024
Reply #28 from Stardock Forums Top

Quoting RandomPick, reply 27

Any other ideas?
End of RandomPick's quote

There are many other things to try thought this thread.

For any test, one thing you need to ensure is that the LT is on main power and test when you know the LT is not sleeping - that the monitor it has is actually displaying video.

Sean Drohan
Stardock Product Lifecycle Manager

Reply #29 from Stardock Forums Top

Hi

The Secondary PC is not sleeping - the monitor is displaying video.

If I force Multiplicity to use a gpu in particular, which ".exe" should I add in the Windows Setting?

Reply #30 from Stardock Forums Top

Quoting RandomPick, reply 29

If I force Multiplicity to use a gpu in particular, which ".exe" should I add in the Windows Setting?
End of RandomPick's quote

For this test, follow the: 

'How do we set the default GPU (system-wide)?'

part...

Sean Drohan
Stardock Product Lifecycle Manager

Reply #31 from Stardock Forums Top

Maybe this can help a lot for others with Black screen / No mouse or control.

I have 4 laptops and 1 of this laptops has KVM screen without control and a black screen, the others work well. 1 has CPU Intel graphics, 2 has a dedicated NVidia and 1 has CPU AMD graphics. Think graphic adapter has no influence on the KVM.

The difference between this one and the others is the Windows version. (Windows 11 Home instead of Windows 11 Pro)

I thought, only Pro has normally remote desktop and I upgrade the Windows 11 Home to Pro.

After that the first Multiplicity KVM connection give a normal screen and total control.

Conclusion what i think:
Multiplicity KVM / KVM Pro only works on systems with a Windows Pro version.

The only question now, if all KVM Laptops and Computer have Windows 11 Pro why should we need Multiplicity KVM if they all have Windows RDP which looks graphical better and have complete control.