Dual Displays switching sides on reboot

Hello,
I have the 2.7 Intel Core i7 released this past July running 10.7.2 with two identical Dell 24" monitors.
The monitor on the left, with the Dock, is hooked up to the thunderbolt port with a MDP/Thunderbolt to DVI adapter and the second monitor on the right is using the HDMI port and hooked up with an HDMI cable. When everything is working properly I can simply drag a window from the left monitor to the right monitor.
Whenever I reboot and the Mac comes back up to the login screen the monitor that is physically on the right is now displaying the image that should be on the left and vice versa for the monitor on the right. The only way to correct this is to pull the cable out of the MDP and plug it back in, and when I do that the right monitor is on the right and the left is on the left.
I have tried shutting down and holding CMD+Option+P+R with the same results.
Any suggestions?

I hate to burst my own bubble here, but I recently added a 3rd monitor, and now I'm getting the same inconsistent monitor switching between my second and third monitors.
Here's my set up:
Mac Pro, OSX 10.8.2
2x2.26 GHz Quad Core Intel Xeon
16 GB RAM
Three Dell ST2420L display monitors
What seems to be happening now is that I get three identical 'color' display profiles. The first one seems to stay on the same monitor, but the second and third monitors now switch at random. I can't seem to get them to stay in any particular order.
Any suggestions or new approaches for solving this would be greatly appreciated!

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My mac pro with dual monitors keep switching sides after reboot

Hi all,
I am having a really weird issues with my Mac Pro after I installed Mountain Lion. I have dual ACD Monitors. Every time I reboot, the monitors switch sides. In other words, the monitor that is in front of me with the dock would switch to the other monitor and vice versa after I reboot. When I reboot again, it switches back again. This is extremely annoying. I have had to switch the inputs on the back of my computer every time.

I hate to burst my own bubble here, but I recently added a 3rd monitor, and now I'm getting the same inconsistent monitor switching between my second and third monitors.
Here's my set up:
Mac Pro, OSX 10.8.2
2x2.26 GHz Quad Core Intel Xeon
16 GB RAM
Three Dell ST2420L display monitors
What seems to be happening now is that I get three identical 'color' display profiles. The first one seems to stay on the same monitor, but the second and third monitors now switch at random. I can't seem to get them to stay in any particular order.
Any suggestions or new approaches for solving this would be greatly appreciated!

Is it possible to run dual display monitors on a KVM switch between my mac mini and a PC desktop?

I have two 23" monitors utilizing DVI that I currently have plugged into my PC desktop. I'd like to purchase the mac mini and utilize the same monitors for both systems and switch back and forth between the two. So, I'm wondering if it's possible. The only two hangups I can anticipate is dual display capability on the mini (I expect that some adapter will be necessary), keyboard compatibility between the two systems, and finding a switch that will handle all the above. Any help would be greatly appreciated!!!!

I think this video could help you
http://www.youtube.com/watch?v=IYoC2teAbmE
Other question is the switch box, You will have eight income cables (4 video, 4 usb) and four output cables
http://www.showmecables.com/viewItem.asp?idProduct=10778
http://www.networktechinc.com/pdf/cat-kvmsplit-usb-hdmi.pdf

T420 Dual Display Temp Switch to Single Display then Back

T420, no docking station, with external monitor connected to VGA port. Windows 8.1 64-bit. Display driver up-to-date, Windows 8.1 up-to-date. Lenovo Syetm Update run and everything is up-to-date. So occasionally it switches back to single display (laptop screen) then immediately switches back to dual display. Seems to do this randonly without warning. I don't see any obvious issues, event log does not show any problems when the issue occurs. I did reinstall the display driver but that did not help. This is more of an annoyance then anything else. I just stop what I am doing and wait for it to switch back to dual display, as I use the external monitor as my primary desktop.

Same problem here. Brand new 2011 MacBookPro 17" and the 27" Cinema Display with the display port. The display goes black for about .5 secs, then comes back on. It is sporadic but happens multiple (30) times per hour.
The display worked fine with my old MBP 2010 with display port, so obviously this is a Thunderbolt issue.
Firmware update please?!

T400 dual monitors to standard display switch?

Hello...
I have a T400 I bought in August 2009 running Windows XP. When I am home, I use my T400 in conjunction with a second dual display that acts as an extended desktop. I also like to take the laptop with me. The problem is that every time I return home to connect my external screen, I have to go through this whole process in Catalyst Control Center to configure the extended display, along with its respective resolution, which monitor is primary and secondary, etc. On another laptop, this process happens automatically, detecting the monitor correctly. If this can't be done automatically, could someone please walk me through how to set this up so it can be seamless? It seems like this should be very easy but I can't figure it out for the life of me!
Thanks for any help.
Best wishes,
Mavec

As far as completely automatic, you may or may not be able to have a reliable experience. BUT the good news is that the Thinkpad Presentation Director utility can make this a "one click" choice rather than completely reconfiguring your displays every time you reconnect. The utility should already be installed on your machine, most likely in the Thinkvantage section. If it is not, just go to the Lenovo site and in the support section for your machine you can download it. Once installed just run through its wizard to set your displays for the way you want them (resolution, primary, extended etc) and it will have you give that a name- from then on when you connect at home you just click on the icon in the taskbar, select that named profile and you are done. Really works quite well and is pretty painless.

Stall or freeze on switching between dual displays

Sometimes when I click from one of my dual displays to another, my computer freezes. It only started happening recently. I pulled my video card out and put it back in one day, and ever since then it does this. Also, its not like the computer completely freezes. Anything that happens via internet (ie internet radio) does not stop playing.
Since this started happening, I have replaced my video card, cleaned the internals of my computer with compressed air, installed an extra fan, and reinstall the graphics utilities.
My video card was a radeon 9600, now its a 9800 pro. Computer is a G4 2x1.25GHz, OSX 10.4.11

"when I click from one of my dual displays to another..."
I do not understand what that means.
Could you please describe, in excruciating detail, how to "click from one display to the other"?

10.5.1 and dual display bug

I have been using my MacBook Core Duo (graphics card GMA 950) connected to a projector in dual display mode for over a year. After upgrading from 10.5 to 10.5.1, the macbook can function in mirror mode, but the projector does not receive a signal for dual display unless I restart the computer. The problem is consistent even though the projector has not changed.
Normally I plug in and the laptop screen changes to blue, then changes to dual display mode and sends a signal to the projector. Now, when I connect to the projector, the projector signal is black. I can switch to mirror mode using either F7 or via the Display preferences but there is no way to obtain dual display mode. Once I reboot, the problem is solved. This has been going on daily, each time with the same solution.

I get dozens of the "ACL found but not expected ..." messages, all on the contents of System/Library/User Templates/. When I go to System/Library/ in Finder, only the User Templates folder has a red icon on it, indicating that I do not have access to it (when logged in as an admin). The icon does not appear on any of the other folders in System/Library. Does anyone have any idea on what's going on?
Message was edited by: Rob J.

Dual display color and other related issues...

I have posted this on painter forums, though some of the issues coming together here are directly related to issues w/ Snow Leopard and dual displays. Thought I would try here....
This is so bizarre. When I ever I run P11(I think this is going on in P10 too?) w/ the OS X (snow leopard, 10.6.2 on quad core Intel Xeon Mac Pro, 10 GB of RAM) menu bar on my Eizo(making it the main display), and the Apple Cinema display left as the #2 monitor, I get very annoying brush cursor artifcats left randomly on the Eizo screen after strokes. One cannot predict when the cursor will leave it's gray "marks", but it will do it, sometimes 5 strokes in a row, sometimes after 15 strokes or so? If I move my brush back over them, or change the image percantage view, they vanish, obviously new ones coming back, as I work.
However I put the OS menu bar on the AC display, yet work back on the Eizo, this does NOT happen. No cursor artifacts. Well, at least I can summon the issue
The reason I am doing this is Snow Leopard has bad color issues w/ dual displays (well documented, much to Photoshop CS4 users frustrations, and mine). Apple needs to fix it... but for me to see the right color on the Eizo(this is my main color and superior display), it needs to be the main monitor(menu bar) in 10.6.2.
So, you can see my trap - Accurate color, or annoying cursor artifacts left on the screen (sorry, it really bugs me as I work) as I work in Painter.
Attempted fixes: Trashed all of Painter's prefs, all of Wacom's Intuos 4(latest driver) prefs and software, switched plug ins on the back of the mac for the displays(lots of restarts), ran cache cleaning Cocktail and DiskWarrior, etc. -- no change, as I can duplicate the issue w/ the above set up. A sidebar or maybe be very related note: I have an iMac w/ max amount of ram (model not very old -- maybe 1 or 2 old) and I have had a long standing issue working on the iMacs we have had w/ this brush cursor artifact problem (in Leopard and Snow Leopard). I am on one monitor w/ the iMac, so you know here the menu bar is...hmmmmmmmm.....?
Thanks!, T

I have posted this on painter forums, though some of the issues coming together here are directly related to issues w/ Snow Leopard and dual displays. Thought I would try here....
This is so bizarre. When I ever I run P11(I think this is going on in P10 too?) w/ the OS X (snow leopard, 10.6.2 on quad core Intel Xeon Mac Pro, 10 GB of RAM) menu bar on my Eizo(making it the main display), and the Apple Cinema display left as the #2 monitor, I get very annoying brush cursor artifcats left randomly on the Eizo screen after strokes. One cannot predict when the cursor will leave it's gray "marks", but it will do it, sometimes 5 strokes in a row, sometimes after 15 strokes or so? If I move my brush back over them, or change the image percantage view, they vanish, obviously new ones coming back, as I work.
However I put the OS menu bar on the AC display, yet work back on the Eizo, this does NOT happen. No cursor artifacts. Well, at least I can summon the issue
The reason I am doing this is Snow Leopard has bad color issues w/ dual displays (well documented, much to Photoshop CS4 users frustrations, and mine). Apple needs to fix it... but for me to see the right color on the Eizo(this is my main color and superior display), it needs to be the main monitor(menu bar) in 10.6.2.
So, you can see my trap - Accurate color, or annoying cursor artifacts left on the screen (sorry, it really bugs me as I work) as I work in Painter.
Attempted fixes: Trashed all of Painter's prefs, all of Wacom's Intuos 4(latest driver) prefs and software, switched plug ins on the back of the mac for the displays(lots of restarts), ran cache cleaning Cocktail and DiskWarrior, etc. -- no change, as I can duplicate the issue w/ the above set up. A sidebar or maybe be very related note: I have an iMac w/ max amount of ram (model not very old -- maybe 1 or 2 old) and I have had a long standing issue working on the iMacs we have had w/ this brush cursor artifact problem (in Leopard and Snow Leopard). I am on one monitor w/ the iMac, so you know here the menu bar is...hmmmmmmmm.....?
Thanks!, T

Dual Displays and Windows XP

Hello,
I have a MBP with the Radeon X1600 graphics card. Under OS X I can run dual displays without a problem, either extended or mirrored. Using Bootcamp to boot to Win XP, I can only get the 2nd monitor to run extended, I can't get it to run mirrored. What really drives me nuts (short trip) is that I have run it in mirrored mode before when I teach. I go to the Display dialog box and "see" both monitors, but the only way I can get anything now on the 2nd is to run extended? I could update Radeon driver on the Windows side, but I thought BootCamp took care of that and I don't want to mess up my laptop?

It is definitely best to reinstall anytime you make a major system change. You will have to do at least a windows repair although I am not sure if it will fully enable the dual core.
Good Luck
Jeremy

Dual display help for a recently converted mac user

I have a 24" Intel IMac and I wanted to set up dual displays. I may have jumped the gun a little because I didn't do much homework but I found a big cheap monitor at Best Buy which is an HP w2338. I bought that and the mini-DVI to VGA adapter. I hooked everything up and both monitors work but I have a couple small issues that I can't seem to find how to fix. First, I have about a 1.5 inch strip along the left side of my hp monitor that isn't used at all. It is just a black strip that taunts me. When I drag things from my IMac to my HP it drags fine, but it just acts like the monitor is smaller than it is. The resolution on my IMac is set to 1680x1050 and on my HP it is 1920x1080. Second, I have very faint vertical stripes in my new HP monitor. They can be seen the best in the grey parts of my windows. Any help with either issue would be greatly appreciated.

On your 24-inch iMac's screen, the native resolution is 1920x1200. You can use a lower resolution, but the display will seem a bit fuzzy (the pixels are being approximated). So you should use 1920x1200 on the iMac's screen, unless you have a good reason to use something else.
On the HP display, it sounds like the native resolution is 1920x1080. That's the resolution of an HDTV, so it should work. However, when you connect an HDTV, it connects with a digital connection, HDMI. So I think it will work if you connect it HDMI. If that monitor happens to have DVI, use DVI.
If it only has VGA and HDMI, there was a recent topic that was very similar (same display I think). Is your iMac the older model (not the brand new 2009 model) with a Mini-DVI port? If so, take a read there to see if the information is applicable to your situation.
http://discussions.apple.com/message.jspa?messageID=9247482
Now, if that display you have is different, and it has a DVI connector, please post back.

Dual display with Lenovo USB Port Replicator 43R8770

Hi,
I have installed the Lenovo USB port replicator using the 1.0.0.1 drivers. I am running Windows XP on a Thinkpad X300.
I can successfully get into dual display mode but when I try to make the external monitor my primary display it will not work. It just switches my primary monitor back the notebook LCD without displaying any errors.
If I disable the notebook display I can set the external as the primary but as long as the notebook is enable the external cannot be set as the primary.
Has anyone ever seen this before?
Solved!
Go to Solution.

I know it's an old discussion, but I wanted to post instructions on getting the dual-monitor setup working, as it took me a while to get it right.  This is using a Lenovo x301 with Windows XP SP3,
Lenovo Enhanced USB Port Replicator and 2 Dell 19" 1280x1024 analog flat panel monitors (I know..I know...)  My
boss didn't want to use the Laptop display.  Just the two external monitors.  Note: before proceding, please make
sure you've installed the Port Replicator drivers.
Connect left monitor (primary display) to x301 VGA port.
Connect right monitor (extended display) to Port Replicator VGA port.
Click on the Intel(r) Graphics Media Accelerator Driver for Mobile icon in the system tray and select GRAPHICS OPTIONS --> OUTPUT TO --> MONITOR
Click on the Lenovo Display Adapter icon in the system tray and select EXTEND TO --> RIGHT
Hope someone finds this helpful down the road.
Message Edited by BMCit on 01-28-2009 01:56 PM

Dual displays problem

Hi,
I just bought two new displays (2x BenQ FP222, 22" widescreen) to use with my new Mac Pro 2.66 (GeForce 7300 GT), but here's the problem: When only the first display is turned on the computer is fine, but when both displays are switched on the picture on both displays goes black every few seconds and then comes back.
I have connected both displays to the computer via 5-metres DVI-cables, which my dealer said would be ok. I understand that I only have the standard graphics card, but as far as I know that shouldn't be a problem unless I try to use dual 30 inch displays.
It sounds to me like it could be a problem with the computer not having enough power to run the two displays (they both use 1680x1050)? Or could it be a faulty DVI-cable?
Has someone got any idea what might be the problem?
/Neworld
Mac Pro Dual 2.66 Mac OS X (10.4.8)

Have you updated the firmware on the nvidia to the latest? Just a thought, but to your comment about powering all the cards...... the power supply will give only 5 volt for each PCI interface rail. The monitors get their power from the AC outlet. As robust of a machine the Mac Pro is, I doubt it will have any issues powerwise even if all of the slots are full. The ATI card requires an additional power cable because it is a much faster card and requires more power than the slot it is in can give it. The nvidia card is smaller and has no fan, only a heatsink. It isn't drawing near the current that the ATI card will, and I haven't seen many, if any posts about dual displays not working on the ATI. Flickering, yes...... but not that it doesn't work. I agree with the other folks that have posted, it's a hardware issue with your video card, or the cables used to hook up the monitors, or possibly the displays are not standard in the way they use the DVI signal.... You can troubleshoot by trying your known good Apple CD on each DVI output, then place it on one DVI and try the BenQ on the other DVI. Make sure you power down in between your tests. This is to make sure you don't blow something, and the video card can reset itself to which display is hooked up. Do either of the BenQ displays work with DVI on either output?..... once you layout your results, you may see a pattern that will help you explain the problem to Apple. I think they may need to send you a replacement video card, but I'm not there to see what is happening. Playing out the scenarios you tested usually makes them pay attention, instead of calling and saying it doesn't work. They put all these issues into a database that they search when customers call with issues. Wow, have I been long-winded!
Good luck
Michael

Dual displays ("extended desktop") on the iBook

This is in response to a previous query that was strangely archived despite the original poster receiving no definitive answer.
The iBook G4 (and various other iBooks) does not support "spanning" dual displays (I believe Apple calls this feature "extended desktop") with Leopard. Evidence of this is the missing "Arrangement" tab in the Display system preference pane.
The Tiger version of Spanning Screen Doctor (http://www.rutemoeller.com/mp/ibook/ibook_e.html) does, indeed, work correctly on an iBook G4 running 10.5.4. After rebooting, the "Arrangement" tab will now appear in the Display pane.
Hopefully this saves some iBook users some time and effort in resolving this issue.
--Brian

Thank you for yor help.
I have one more question to ask? If I use the LCD TV like Sony or Samsung with the New i-Mac will I loose deskspace on the LCD TV due to the low resolution on the LCD TV? I thought the LCD TV was a good idea since it has all the input for all my DVD player, TV box?, Nintendo, and the VHS?, but I was told that LCD TV might not be too compatible for use with a computer.
How do I put all my stuff on a Apple 23" LCD display I only can find adapters that can only take one peripheral at a time, and I don't want to re plug a TV box each time I want to watch TV. It looks like I need a box for use with Apple display with 3~4 input and S video, and HDMI input for the HD stuff?
Again thank you for all your help.
12" PowerBook G4 1.5 Mac OS X (10.4.4)

Dual Displays (Dual Monitors)

I cannot seem to find this information anywhere.
Can anyone tell me if LR supports dual displays? That is the develop screen on one screen and library on the other?
Cheers

This is the way I work: Don't use Lightroom in a full screen window but enlarge the Lightroom Window from the leftside of monitor one into the right-hand side monitor, but just the right panel visable on monitor 2. If you hit the F6 and F7 keys the left- and bottompanels disappear and you have allmost a full screen to work with, and the devolop panel remains on the richt-hand side on monitor 2. Just try, it works complete well at me. gr. Jaap <[email protected]> schreef in bericht news:[email protected].. > > > I cannot seem to find this information anywhere. > > > > > You probably didn't expect to find the topic in the "Lr Features requests" > forum ...<g>... > > Can anyone tell me if LR supports dual displays? That is the develop > screen > on one screen and library on the other? > > > > > The answer is 'no', but you can believe Adobe has already heard an earful. > I suspect it'll come ... eventually. > > Part of the surprise and criticism has come from me .. but I have to admit > Lr's interface to a single monitor is one of the best I've seen. > > cheerios :o)

Dual displays and MacBook3,1

Hi all!
After switching off the external monitor, mac os x continues to switch to dual displays (blue blink).
$ uname -a
Darwin hostname 9.5.0 Darwin Kernel Version 9.5.0: Wed Sep 3 11:29:43 PDT 2008; root:xnu-1228.7.58~1/RELEASE_I386 i386
***?

"I physically turn the external display, but blue blinks remain."
you mean you unplugged it from the computer right? there goes my theory :P sorry

Dual Displays switching sides on reboot

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