Multiple Displays Problem - 3rd display shows pointer arrow only

Not from what ivé seen in the seeds.

The release of 10.8.3 is imminent. If it doesn't include the fix, then I'm going to have to downgrade to 10.7.4. The question is whether or not 10.7.4 will work with a GTX670 and a GT120. The latest 305.xx NVIDIA drivers make the problem worse when using portriat displays on ML 10.8.2. I assume they work just fine in Lion.

It seems that tmikaeld is correct. Having multiple video cards is casuing this issue. I removed the GT120 and I now have two monitors working in portriat mode off a single GTX670. This is with the latest NVIDIA driver and OS X 10.8.2. Once I get the HDMI->DVI and DP->DVI adapters, I will test if the 670 can output to 4 monitors in portrait mode.

I have tried portrate mode with 3 cinema-displays and it works perfect - i'd supriced if it did not work with 4 monitors.

My problem was fixed with 10.8.3 !!!

Well i'd be ******, he seem to be right!

So what's stated is that you can use multiple cards to drive multiple monitors in portrait mode?

Now we need a fix for 10.7, for those of us who can't upgrade to 10.8...

(MacPro 1,1 and 2,1 owners).

I updated Mtn Ln to 10.8.3 and it did fix the black screen in portrait mode. However, it also added another problem related to scaled resolution in portrait mode.

If you use "scaled" resolution versus "best for display", the resolution doesn't scale right. Either too short, or too big. Also, the workspace size is larger than the monitor's real size. If you maximize a window, it will be larger than the screen.

Using best for display doesn't produce this problem.

At least it shows they're on the right track. I bet this is an easier fix than the last. Meanwhile, I'll just squint at the fine print on my portrait monitor or adjust it so it's only a few inches from my head.

I'm working now as well with 10.8.3.

MacPro 4,1, running three GT120s, two monitors out of the three in portrait. Feels like forwever since I've seen all three of these screens lit .

10.8.3 it works! I have 6 monitors in portrait mode working like a charm for the last hour.

I have 3 Nvidia Geoforce GT 120 512 MB graphics cards.

We shall see. Ask apple on 8-24-12 and and you shall receive on 3-18-13.

PROBLEM SOLVED IN 10.8.3

MacPro 4,1

2 NVIDIA GeForce GT 120

30" Apple LCD (no rotation)

23" Apple LCD (270º rotation)

32 GB RAM

1 SSD (boot)

1 RAID-0 (dual-10K HDs, multiple-partitons: scratch, data, windows 8)

1 Backup (2 TB)

Thank you Apple

A friendly gesture of good-faith would be to issue all of us loyal MacPros users (that you put through HE11 for several months) within this forum that have reported these bugs a small gift in the App Store.

this did NOT solve my problem... I responded too soon.

Yes I am able to have 6 monitors in portrait mode with 3 Nvidia Geoforce GT 120 512MB graphics cards but as of yesterday, my whole system shuts down and reboots. This happened 3 times in the span of about an hour.

I removed all but 2 monitors running on only 1 Nvidia Geoforce GT 120 512MB graphic card and the system crashes stopped.

So I am back to either waiting again for some resolution from apple or looking into buying newer graphics cards.

Oh well, it was fun while it lasted... a whole day.

Again, I can't get no satisfaction...😟

I've got three GT120s and I'm driving three monitors off the DisplayPort connectors, one to each card, but only two rotated (one 270 degrees, one 90 degrees). Previous to 10.8.3 I could only get one of the rotated displays live. I've had the setup running now with all three monitors for four or five days, no crashes or reboots. Maybe there's something goofy with using the DVI interface on the cards?

I will give this configuration a shot. I will use only the displayport VGA connectors. 3 monitors in portrait mode.

Wish me luck. 😐