Connecting 8 720p projectors + Led Panel + Master Display

[Joris]

The problem with using multiple graphic cards, aside from the obvious performance drop, is that Desktop Window Manager can get confused over what it is we actually want to do.

In OpenGL there is no such thing as exclusive fullscreen like in DirectX, so for spanning multiple outputs in fullscreen, Resolume creates a borderless window at the resolution of the outputs you want to cover. The Windows window manager detects this and then enters a mode of fake fullscreen for that display.

When doing this for multiple cards the Desktop Window Manager seems to get confused as to whether or not it should do compositing or not. On secondary displays it has fullscreen windows, but on the primary display it hasn't, thus it's doing compositing for the primary display, which is not needed by the secondary displays.

This results in all sort of weirdness like flickering on and off, or having the second card flickering between the right output and the output of one of the other monitors. We've noticed it most on AMD cards, NVidia seems to handle it a little better. Sometimes even using a different adapter from the same port will solve it, for instance using MiniDP to DVI instead of to VGA.

Since Win 8, it's also no longer possible to turn off DWM, so multiple cards is unfortunately always going to be a bit hit and miss.

[Mariusblk]

After some time i recorded the flicker problem. You can see it in the link below.

phpBB [video]

The problem starts whenever i try to output through the second Club 3d. So if i use one single graphic adapter all cool but if i try to use both i get this flicker problem.

This doesn't happen using Arkaos even if it is way more expensive, so it's not Windows, just some Resolume problem with AMD adapters, or Club 3d

[Mariusblk]

So, any idea? Any Resolume official can explain this? The equipment seems to be compatible, according to Club 3D support. In windows 7 and 8 projectors make a damn good job, used them for a while to accommodate with the enviroment but when i turn to resolume all is in vain.

Dual AMD GPU isn't compatible with Club 3D MST's and Resolume, that's a fact for me atm.
Maybe it works with NVIDIA hardware and Datapaths but that is a cost i can't afford.
For all others try Arkaos, works like a charm with this setup. It's been more than 1 month since i'm testing it.

GL to all resolumers.

[Joris]

I explained the problem two posts above this one, Mariublk. It's a bit of a technical issue, so if there's anything unclear, let me know.

I'm very sorry to hear you cannot get this setup to work with Resolume. There is another user on this forum who uses two AMD R9 cards with MST hubs to great success. But as I say in the above post, using two cards is always very hit and miss and we don't recommend it.

It's great to hear that you at least have a working solution with GrandVJ!

[Mariusblk]

Can you please point me to that user, i'd rather change something in my setup, because i really like how resolume works and reacts to users needs than using any other software. Thank you for this reply and hope we will get along in the future, i'll try any other software update that will come on the way or maybe i'll get some hardware tips to make it work.

[Joris]

Oaktown. He was one of the people who gave you some advice earlier in this thread.

[Oaktown]

and I'm back from my long sabbatical