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michaeldavishome
michaeldavishome
Join Date 04/2025
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Seamless Connection Broken - Secondary appears in "standard mode", cant control it. Does not appear in advanced resolution aware

May 27, 2025 8:14:32 PM from Stardock ForumsStardock Forums

Primary Windows 10 Version 22H2 (OS Build 19045,5854)

Secondary Windows 10 Version Version 22H2 (OS Build 19045,5854)

Primary Multiplicity Version 4.01 Pro

Secondary Multiplicity Version 4.01

 

Everything was working fine using seamless switching and advanced resolution aware grid mode - added an additional monitor to secondary, still working fine - as I was fiddling with monitor positioning in seamless connections using advanced resolution aware grid mode and windows display settings  - secondary displays disappeared from central monitor view in multiplicity advanced resolution aware grid mode

 

Connection to secondary still there as switching out of advanced resolution aware mode shows the primary and the secondary - cannot move mouse onto the secondary though - should default to just moving onto secondary when panning off the RHS of primary - it doesn't

 

I have uninstalled on both primary and secondary - rebooted and reinstalled, and I am still getting the same behaviour - please advise

 

Audio sharing works - sounds from the secondary come through on the primary

 

Imgur link with some images - https://imgur.com/a/FwLKSaM

 

*edit - added some reg keys images - I'm going to guess one of these is the culprit  - I haven't touched them - uninstall and delete Stardock reg key and all under it to resolve?

 

Update - uninstalled bot fully again - installed from another installer file labeled Multiplicity_4.0.1.1-j139_setup.exe   Issue persists - added screen shot of trying to drag machine into seamless window

 

Update - deleted HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers\Configuration and HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers\Connectivity on the secondary - This has managed to get me to the last image uploaded (second last image below)

Update - Image Mult13 added, second last in images below. To achieve this I edited HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers\Configuration on primary and secondary to the following:

Primary 3   x:640  y:360  (1080p)

Primary 2   x:0    y:1440 (1440p) (windows primary)

Primary 1   x:2560 y:1440 (1440p)

 

Secondary 1 x:2560 y:0    (1440p)

Secondary 2 x:5120 y:1440 (1440p) (windows primary)

Secondary 3 x:5120 y:360  (1080p)

 

I have seamless KVM except that I cannot move mouse from Primary 1 to secondary 1 or from primary 3 to secondary 1. In reverse it works fine, that is secondary 1 to primary 1 and secondary 1 to primary 3. Advice needed now for x/y reg values that will allow seamless in all directions.

 

 

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michaeldavishome
basj
Join Date 03/2001
+1640 sdemployee
Reply #1 May 27, 2025 10:08:12 PM
from Stardock ForumsStardock Forums

Hello,
Sorry to hear you are having issues. I have forwarded your problem/question to Stardock Support Team for their assistance. Please keep an eye on this thread for any updates. We appreciate your feedback and patience.

Thank you,

Basj,
Stardock Community Assistant

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michaeldavishome
sdRohan
Join Date 10/2012
+715 sdsupport
Reply #2 May 29, 2025 12:24:47 PM
from Stardock ForumsStardock Forums

Michael, I want to reduce this to a core...

Forgetting, for a moment, all the data you have posted, can you answer these directly:

'Everything works fine for Seamless connections, in Advanced Resolution mode, until I do X'

What is X, exactly?

'When I do X, these things happen.'

Lastly

'If I undo X, all is fine (yes \ no).'

Sean Drohan
Stardock Product Lifecycle Manager

 

 

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michaeldavishome
michaeldavishome
Join Date 04/2025
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Reply #3 May 29, 2025 6:29:13 PM
from Stardock ForumsStardock Forums

Hi Sean,

Sure, here’s a concise breakdown of the issue:

Everything works fine for Seamless connections, in Advanced Resolution mode, until I do X.
✅ Everything works after manually editing the monitor position x,y values in

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\GraphicsDrivers\Configuration

to match my monitor layout exactly across both PCs.

❌ However, as soon as I adjust monitor positions in Windows Display Settings (by dragging monitors or changing the primary display on either PC), Windows rewrites these x,y values with large negative offsets that push the secondary PC’s monitors far outside the grid.

When I do X, these things happen:

  • The secondary PC’s monitor group disappears from Multiplicity’s Advanced Resolution Aware grid.

  • Seamless connection between primary and secondary no longer works (mouse cannot cross).

  • Audio and connection remain functional, but seamless mouse control is broken.

If I undo X, all is fine (yes/no)?
✅ Yes, but only by manually editing the registry x,y values back to the correct positions on both machines.
❌ There is no in-app option or automatic way to restore functionality without these registry edits.

Additionally:

 

  • After editing the registry, seamless control works across all monitors, except at two junctions:

    • Primary 3 → Secondary 1 (mouse won’t cross)

    • Primary 1 → Secondary 1 (mouse won’t cross)
      However, crossing from Secondary 1 to these primary monitors does work.

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michaeldavishome
michaeldavishome
Join Date 04/2025
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Reply #4 June 2, 2025 7:15:24 AM
from Stardock ForumsStardock Forums

Update - replaced primary 3 and secondary 3 monitors with 1440p monitors (instead of 1080p)

Deleted all previous changes and let windows detect monitors again - Monitors show in their correct postions in advanced resolution mode.

Seamless KVM works with the exception of a specific flow, that being if I move from Primary 3 to Secondary 1 and then go down to Primary 1, the mouse gets looped back to the top left corner of Secondary 1.

Looking at the automatically created reg keys for monitor positions they all look good with the exception of Primary 3 which has a cy position of (decimal) 4294965856

 

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