Question When I switch the KVM for my 2nd display it causes primary to flicker/reset

Red Squirrel

No Lifer
May 24, 2003
64,358
10,602
126
I have two TESmart KVM switches one for each 4k monitor, primary and secondary, they have been flawless and probably the most reliable switches I've ever used. Most others lock up are slow, and just overall garbage. However a problem recently just started. When I switch the 2nd one to switch the secondary monitor, it will cause both monitors to do a reset. The whole reason I put a KVM is to avoid just that, because when you switch inputs on the monitor or even simply turn it off the same happens. This is to ensure I can do a seamless transition between work and home without my windows being reshuffled all over the place or that I can turn off my monitor without that happening too. This is a HUGE issue in windows, but unfortunately even Linux Mint seems to experience it now too. This had originally fixed my problem, until now.

Basically what happens is when the secondary switch is switched to the active PC that's when it causes the reset to happen.

I also get this error in dmsg, I assume it's related:

Code:
[3819817.634390] pcieport 0000:00:03.1: AER: Multiple Corrected error received: 0000:07:00.0
[3819817.634401] amdgpu 0000:07:00.0: PCIe Bus Error: severity=Corrected, type=Data Link Layer, (Receiver ID)
[3819817.634403] amdgpu 0000:07:00.0:   device [1002:67df] error status/mask=000000c0/00002000
[3819817.634406] amdgpu 0000:07:00.0:    [ 6] BadTLP              
[3819817.634409] amdgpu 0000:07:00.0:    [ 7] BadDLLP
Anyone know how to solve this? I want to ensure that the PC does not even know that the KVM is being switched, as that is what causes it to reset the monitors and reshuffle all the windows. All links are via HDMI. My work PC uses DP to HDMI, but currently is not hooked up so that's out of the equation.
 
Last edited:

vishvajit

Junior Member
Jan 21, 2023
10
0
6
I have two TESmart KVM switches one for each 4k monitor, primary and secondary, they have been flawless and probably the most reliable switches I've ever used. Most others lock up are slow, and just overall garbage. However a problem recently just started. When I switch the 2nd one to switch the secondary monitor, it will cause both monitors to do a reset. The whole reason I put a KVM is to avoid just that, because when you switch inputs on the monitor or even simply turn it off the same happens. This is to ensure I can do a seamless transition between work and home without my windows being reshuffled all over the place or that I can turn off my monitor without that happening too. This is a HUGE issue in windows, but unfortunately even Linux Mint seems to experience it now too. This had originally fixed my problem, until now.

Basically what happens is when the secondary switch is switched to the active PC that's when it causes the reset to happen.

The issue you're experiencing is related to how the KVM switch handles the video signal when switching between the two computers. This can be caused by various factors, such as compatibility issues between the video cards, the drivers being used, or the settings on the KVM switch itself.
It's worth checking the specifications of the KVM switch and the video cards in the computers to ensure that they are compatible and support the monitors' resolution and refresh rate. If both are compatible, try updating the drivers for the video cards and the firmware of the KVM switch to the latest version.
You can also try experimenting with different settings on the KVM switch, such as enabling or disabling "hotkey" switching or adjusting the timing of the switch.
You can also use a different KVM switch specifically designed for high resolutions, 4K and high refresh rates, such as TESmart, ATEN, and startech.
If all else fails, please contact the manufacturer of the KVM switch for additional assistance.
 

Red Squirrel

No Lifer
May 24, 2003
64,358
10,602
126
From further troubleshooting it seems the issue does not happen if there's at least two PCs connected to it. Essentially the only time I typically do switch it is when I'm working from home as I'll switch the top monitor to work and then switch it back to home after my shift. But if I take my work PC away while it's still switched to it, then switch it to home, that's when it seems to make all hell break loose. At least that seems to be it anyway, I try not to play too much with it as when it does happen it causes lot of issues with windows flying all over.
 

ASK THE COMMUNITY