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Topic: Using Multiple Laptops With A DVI Switcher
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Carsten Kurz
Film God
Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009
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posted 02-04-2010 06:58 PM
I just came across the same issue when trying to build a preview monitor solution for a digital projector with various sources. We found a HDMI 4:2 Matrix which operates quite nice - but indeed with every switching it reconnects the whole matrix in- and outputs, even on connections that are not affected by the intended switching.
I found this to be no real problem with BlueRay Players, SAT-Receivers, etc., but it is a real pain in the ass for computer sources - in this case, a Windows PC was connected through it's DVI-Output to the HDMI matrix. Every switching disables the secondary monitor connection. It will usually come back, and you can disable the notification that comes up - but, the running application then sends its window to the primary monitor and will not return it to the secondary monitor by itself, even if the secondary monitor output is reenabled by the matrix within fractions of a second after the switching. That's a huge difference to the behaviour with analog VGA connections.
We actually solved this by using the analog VGA output of the computer connected to the HDMI matrix through a (slightly absurd in general...) VGA-DVI converter (about 50US$). Now only the VGA-DVI converter get's disconnected through the switcher - but not the PC.
Whatever you do with these DVI/HDMI switching solutions - don't take anyhing for granted. Try before you buy. You will be surprised or disappointed multiple times...
With HDMI Switching/Splitting, you will also have to take into account other features of your gear, like 1080p24/p50/p60, HDMI/DVI colorspaces (RGB, YUV).
Our beamer applies certain presets to it's various input sources automatically. Now that's normal. But I also found out that it applies separate presets when the source on the same input switches from HDMI-RGB to HDMI-YUV! It chose a different colour/gamma setting when I configured our BluRay Player from RGB to YUV on it's HDMI.
Analog switching is A LOT easier!
- Carsten
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