Welcome @PaveFE,
Thank you for taking the time to ask your question here on the StarTech.com Community.
This is a rather strange issue. I have some ideas about why this sort of issue could occur.
First, I suggest trying a power cycle that often helps quickly resolve display problems with hardware-based KVMs like the SV231QDPU34K.
KVM Reset / Power Cycle
The steps here should generally work for any of our hardware-based KVMs. This is essentially a power cycle, but since these types of KVMs can draw power from computer connections there are a few extra steps
- Remove the USB-B cable connections from the KVM that go to each of the computers
- Remove the DC power barrel connector from the KVM
- Confirm the KVM is not receiving power
- The LEDs that normally illuminate the indicators on the front should not be on
- Wait a moment or two
- After waiting, reconnect the DC power
- Ensure that the front panel LEDs are now active
- Switch to PC 1
- Reconnect the USB-B connection for PC 1 and test
- Switch to PC 2
- Reconnect the USB-B connection for PC2 and test
These are the most valuable troubleshooting steps for hardware-based KVMs. These have helped me when troubleshooting with most of my customers. They have helped on my own KVM when power disruptions, poor power conditions, and other changes have occurred.
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Let’s discuss some reasons why this kind of thing could occur.
Video Resets
Windows normally retains information about the monitors, including manual settings, allowing you to remove and reconnect monitors without additional configurations. When this is not occurring, this could mean that the monitor information is not being passed correctly to the computer. Or the display information that Windows has retained is corrupted in some way.
The power cycle, or KVM reset steps above usually can help with the monitor information if the KVM itself is experiencing an issue.
If the Windows settings are disrupted I have found it effective to try making multiple changes to the display configuration. This seems to have reset the monitor information in some way for me in the past. Here is a set of steps that I might try in the Windows display settings, though in no particular order:
- Set each monitor to extended
- Disable each monitor in turn by setting to disconnected
- Duplicate each monitor in turn to another monitor, mirroring
- Set each monitor back to extended again
- Set each monitor back to disconnected again
- Finally, set each monitor to the desired configuration
While I have not discovered exactly how Windows stores monitor information I have not yet found a simpler way to clear the display information history. There is a graphics driver reset hotkey sequence that you can try too:
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A couple of other factors may be each monitor’s onboard settings display adapters.
Video Adapters and Monitors
Graphics adapters on each computer may perform differently in some circumstances. Ensuring the latest drivers are installed can help.
Are there any video adapters, adapter cables, or converters used with the connections on the SV231QDPU34K? If so, please share any model information. It may be helpful to know if they are active or passive adapters.
Also, check the monitor on-screen display functions for any settings related to DisplayPort versioning or MST and try different settings to see if that helps with switching performance. If you wish to share the models of the monitors that are used with the KVM we can review those also.
Conclusion
I am curious if these steps, or this information, helps you with the switching troubles on this KVM, or if any other changes that help.
Reply with as much detail as you can if the issues persist and I will be happy to investigate this further with you.
Sincerely,
@DavidF