Mac Pro Dual Monitor Issue

[mongorama]

I'm not sure if there's anything I can do about this, but thought I'd ask. I have a Mac Pro (Early 2009) running Lion, with a Radeon 5870, and 2 monitors. Both monitors are connected to the 5870 with HDMI to Mini Displayport convertors (Different brands for the convertors).

For the most part, I use the secondary monitor for iTunes, iCal, Twitter, etc... Anytime I turn off that monitor, even if for just a minute, then turn it back on, all app windows that were placed over on the secondary monitor get moved back over the primary. It's not a deal breaker, but it's a bit unfun to reposition all of these apps several times a week.

Is this a common issue?
If not, is there a silly fix I'm not realizing?

 

[The-Pro]

Maybe try and connect the monitors to different outputs on the cards. Switch them around. I had a similar issue but with two GT 120's it was better when i moved my second card to the third PCI slot. And at one point it was gone.

 

[M&M]

Anytime I turn off that monitor, even if for just a minute, then turn it back on, all app windows that were placed over on the secondary monitor get moved back over the primary. It's not a deal breaker, but it's a bit unfun to reposition all of these apps several times a week.

Is this a common issue?
If not, is there a silly fix I'm not realizing?

Why turn the display off. Just use sleep mode.
And no it's not a common issue.

Try using the DVI connectors if you have them and check how the displays behave later.

Good luck

 

[initialsBB]

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My 2 screen setup doesn't do that. Once they are plugged in end to end, it doesn't matter wether they are in sleep mode or entirely off. One is mDP-DVI and the other is DVI-DVI. I have a 5770 but I assume that doesn't change from your 5870.

It seems to me either the adapter or the screen is making OS X think there is only one monitor plugged in.

 

[mongorama]

I think I've tracked it down to the Moshi HDMI to MDP adapter that monitor was using. I've replaced it with a Kanex brand adapter and it's just fine now.

Thanks all.