Troubleshooting with my QLab rack

[Olivier OLRY]

Hi everyone,

The troubleshooting happens when we switch computer’s through KVM : when switch only the Kramer we can monitor both surfaces Main/Spare without any problem, but as I switch KVM, Qlab Cue window switch on surfaceSpare, it mess the video Audition window Surface, and it provides a delay and sometimes a scratch on the audio outputs of the soundcard.

[j...@2imagineit.net]

This sounds very similar to what I just encountered this weekend.

KVM to switch between A&B, but also using a Radial SW8-USB to auto-fail.  Very time I switch screens, it also fails over.

Tracked it back to what appears to be an issue with the KVM not presenting a stable EDID to the computers, so they see the display "change".  In my case, it is advertising (or stops advertising) HDMI audio out.  Even though I am not using it, every time it happens Qlab adds/removes HDMI (and adds back all the other audio source I am not using) from the audio list and the audio glitches.

While the screen resize can't be helped - that is an OS function, and probably part of your issue - I am running in show mode with "Disable disruptive OS functions" Enabled (4.6.9) and this is still causing a reconfigure, even though I would expect it to be ignore based on the preferences.

Jay

[Alexander (Mailing List) Taylor]

This isn’t an inexpensive solution, but you can put a DataVideo DAC-70 (or equivalent) between the mini and the KVM.  That way the OS won’t see the KVM changes at all.

Alexander

On Nov 21, 2021, at 7:31 PM, j...@2imagineit.net <j...@2imagineit.net> wrote:

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[j...@2imagineit.net]

Alexander,

Thanks.  Adding hardware goes against my rule for "KISS", but it is one of the options.  The first one is a different KVM coming with intelligent EDID support, or I can use learning EDID modules to keep it stable.   All add to the complexity.

Ironically, I use a cross-converter on the KVM output to feed a monitor for the stage manager (SDI).

Cheers,

Jay