New ATI 4870 - No Video with dual Monitors

I have just received my ATI 4870 and am having some very unique problems. I have a dual display setup (NEC 2690WUXi2, Apple LED CD) running as an extended desktop. I have 2 Intel SSD X25-M in raid 0 as my boot drive in bay 1 and 2 of my Mac Pro 2.26.
The ATI card will not supply video when booted from the SSDs if both monitors are hooked up. The video stops abruptly right after the NEC is fed a signal and both monitors go blank. If only the Minidisplayport is used I get video and can subsequently plug in the NEC to the DVI port for dual displays. If I boot from one of my outboard clones the system will give me video on both monitors. I am also able to boot successfully from a SATA clone in Bay 1.
The computer boots flawlessly with 2 monitors when using the stock GT120 video card - this is from any source SSDs, outboard, etc. I have a 'clean' install of OSX with no programs that also has the same problems - no video from the 4870 and works flawlessly with the stock GT120.
If both video cards are installed I have a flawless boot. The NEC is attached to the ATI card and the Apple LED is attached to the GT120. Everything works like a champ. My thoughts are that this may be some timing issue with the SSDs and the ATI card when used alone. I can't think of any other explanation. Does anyone have a suggestion if I want to use just the ATI card?

You're sig says you have a 2009 mac pro. If so, you shouldn't need the drivers anyway as your 10.5.6 preloaded should already be the "special" version.
The beta drivers link pretty much pertained only to 2006 to 2008 mac pros ordering the 4870. As their 10.5.6 was the "plain" version.
What might be a culprit is that apple is shipping updated versions of the 4870 (different device/revision IDs). The beta drivers were taken from pre-release builds of 10.5.7 sent to devs. Maybe the updated versions are not jiving with the beta drivers, and made in particular for 10.5.7.
Well if any consolation, 10.5.7 may be as close as this week.
http://gizmodo.com/5241438/mac-os-x-1057-update-may-hit-this-friday

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Hi community,
I have stumbled to a nasty problem on my first incursion to dual monitors in openbox.
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Last edited by andreamer (2010-07-26 18:32:15)

TL;DR - I'm not aware of any acceptable solution at the moment.
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Also, I developed a panel myself (and got pretty far along) using the PyGTK toolkit... But I can't remember if I solved this problem or not. I'll try to check it out and get back to you. (I got as far as implementing a widget system that includes a task list, system tray, clock, menus... It just isn't polished very well. My original intention was for it to be a more robust PyPanel with dual monitor support.)
Last edited by BurntSushi (2010-07-24 22:46:23)

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[SOLVED] Help with dual monitors (second monitor won't wake up)

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xrandr gives this
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1280x960 60.0
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Last edited by Pacopag (2013-08-19 18:58:36)

I use XFCE, and when I boot my computer I just run:
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I'm assuming if you modify the names appropriately that it'll work too. I have had issues before trying to run dual monitors without taking both outputs off of a single video card (which is what I'm doing now). For example, I had a graphics card with one (VGA) output and a VGA output on my motherboard. But, connecting the graphics card disabled the on-board VGA. So it is possible (I'm not an expert here) that two displays coming off the motherboard may not work for hardware reasons.

New ATI 4870 - No Video with dual Monitors

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