External Monitor in Lion

I just replaced my late-2006 iMac with a mid-2011 21.5-in, 2.8GHz Core i7. Had to get new adaptor (Kanex iAdapt MDPHDMIV2 HDMI V2 - Mini DisplayPort to HDMI Adapter with Audio Support-$14.99 at Amazon) and HDMI cable to hook up my HP w2207h external monitor, set to 1080P/60 Hertz in Display Prefs. While all applications appear fine, the external monitor keeps losing the desktop photo I have designated and reverts to a plain gray background. The main display shows the desktop picture just fine. Any suggestions what the issue may be? The hp monitor had functioned normally with the old system running 10.6.2.
Also let me add, for those doing something like this, when I first hooked up the adaptor and cable the external monitor seemed not to have a signal. If I hit the "Menu" button on the monitor it would faintly show the display preference screen for a moment, then fade to black. I used "gather windows" to get the preference pane for the HP onto my main screen in order to set the resolution, then it sprang to life.

Turns out the problem appears to be fixed after zapping the PRAM.

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Anyone having problems with Safari on an external monitor with Lion?

I have an iMac with external second monitor. Upgrade to Lion. Aside from it being terribly slow, and having typing problems (where first letter appears 4th or 5th when beginning to type), I've noticed the following:
On iMac monitor, everything works fine.
On the external monitor, it's often impossible to fill in a form. Drag Safari over to the main monitor - no problem. Drag it back - still can't complete a form.
Another example: Netflix. Plays on either monitor. However, stopping and starting a movie with the mouse doesn't work. With the space bar, it does.
Overall terribly disappointed in what Lion has done to my computer.

What exact problems are you having? I have been having intermittent problem with mine. Sometimes certain sites will not connect. I get a message that the server stopped responding. I open Firefox and it connects fine.
-Bmer
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Hook up 2 external monitors with Lion OS

How do you get 2 external monitors to work with Lion OS, now that I have installed Lion I can no longer boot my second monitor? I have downloaded DisplayLink's new software but still no luck. Any ideas? Thanks

ok so you have a macbook pro with minidisplayport and you can see your desktop on your LG screen?
go to system preferences>displays>arrangement and turn off Mirroring (if it's on). This will give you two separate areas and look similar to this.
If you want quick access to this setting click the "show displays in meny bar"
a little pointer, you see on my setup that there is now one screen with no white bar at the top and one with. This marks where your main screen is (and where the menu bar and dock appear) you can click and drag this white bar to your new LG tv.
Most new tv's have a setting to fit the screen to the tv size. This is a setting that allows for edge to edge persision instead of overlapping which you'll see in older tvs. Take a look at your tv's manual for more about this sort of connection.

Mac Book Pro (Mid 2010) is no longer recognized the external monitor since Lion update.

Mac Book Pro (Mid 2010) is no longer recognized the external monitor sinceLion update. On Mac OSX 10.6, I had no problems.
Mac screen is just blue, as if he switches. But then there is no further signal.
What can I do?

Bump- I have the same issue. Screen slowly dims for no observable reason until I rearrange to point it more directly at light source. Odd thing is that the light in the room does not change. So scren will be fine for hours while I am working and at some point just slowly dim until I rearrange. Any information helpful.

Macbook with external monitor, running Lion, will not go to sleep

I have software version 10.7.5 and my macbook will not go to sleep on its own. It will go to sleep if I hit the power button and then tell it to go to sleep. I have turned off all sharing and I have set the preferences to sleep after 15 minutes. Yet, I hear the hard drive spinning all of the time. Any suggestions??

Have you reset the SMC? If not, try that.
Intel-based Macs: Resetting the System Management Controller (SMC)
If you've done that, and it didn't help, then launch the Terminal application by entering the first few letters of its name into a Spotlight search. Copy or drag -- do not type -- the line below into the Terminal window, then press return:
pmset -g
Post any lines of output that appear below what you entered -- the text, please, not a screenshot. Then repeat with the following line:
pmset -g assertion

10.7.3 external monitor "input not supported"

I have an external monitor connected with the Aplle VGA adaptor to my MBP.
It has been working fine for the last year.
Today I installed 10.7.3
And now I get the message "Input Not Supported" on the external display.
Not impressed.
Any ideas or do I have to roll back this update.
Cheers.

OK now it gets silly.
I have also had a problem, since I instaled Lion, that when I open my MBP the screen is black and no amount of encouragement will bring it to life.
So, I have to switch on my external monitor. My deskptop thern appears on the externam monitor, so I select "Detect Displays" from the menu bar and, kazam, my MBP screen comes to life and the desktop moves there.
It only remains for me to switch off the external monitor and wait for Apple to provide a fix.
Now, remember my current problem, in that the external monitor wil not work and shows "input not supported".
So today I opened my MBP and sadness, the screen is BLACK. So I switched on my external monitor and WAHEY! it worked and the desktop appeared on the external monitor.
Excited at the prospect that my problem had somehow magilcally fixed itself overnight, I selected "Detect Displays" and my MBP screen duly appeared and the desktop meved there.
The external monitor then stopped working and showed the message "Input Not Supported"
I also have a related VNC problem that is still outstanding, so I think it is fair to say that there are several issues around external monitors with Lion.

Macbook with lion; external monitor won't wake

I have a 2008 unibody aluminum 2.0 ghz MacBook with an Acer s232HL 23" external monitor. Lately I've noticed that the external monitor won't come back to me after I put the computer to sleep. I'm using Lion and a Dynex MiniDisplay Port to DVI adapter. I never used to have this problem with Snow Leopard, but I got Lion right after it came out, and I could swear this problem didn't really start until a week or two ago.
I'm able to get the monitor back, but only after unplugging and replugging it in about 15 times.
Here's what happens:
I wake the computer up from sleep. The laptop monitor comes on. The light on the monitor turns from amber to blue, and it cycles through its ports–DVI, HDMI, and VGA–looking for a signal, before saying "no signal", and going back to sleep.
I unplug the monitor from my laptop.
My laptop screen briefly turns blue as it is reinitializing.
The Acer light goes from amber to blue again, and cycles through its display. If I leave it unplugged, it says "no cable attatched," or something.
I plug it back in.
Laptop monitor briefly goes blue.
Acer light goes back to blue and it cycles through its ports again before saying "no signal."
I repeat this a multitude of times, until the computer and monitor seem to randomly agree to speak to eachother.
Has anyone else experienced this and found a more acceptable solution than mine?
Thanks,
Sam

Hi Sworden79, I'm having exactly the same problems with my Macbook Pro 2011...
I didn't notice the problem at the begining, I think it start to happend with one of the Lion updates...
Is really anoying... to make it worst, some times when I restart the computer if the monitor is plug in the computer freeze... I have to disconect the monitor from the computer, then force restart long pressing the power button, wait till Lion load and then connect the monitor back... (experiencing this issue that you are describing then...)
I notice that it reduce the amount of cicles it takes to recognize the monitor if you have display preferences open when you connect the monitor to the mac...
This is SO annoying!

IMac external monitor not working after lion upgrade

Hi,
I have had an external monitor hooked up to my 09' imac for over a year now. I upgraded to Lion and ever since then it hasnt worked but one other random time when I moved and hooked everything back up. Im very tech savy, but this just doesnt make sense. Have combed google to find a solution. I have a Samsung 22in moniter and all the blue power button does is blinks at me. I am using a miniDisplay to DVI connection.
Does anyone have any suggestions other than resetting the ram?

I guess it's possible you've got some kind of hardware problem.... but not likley given it started with you installed your OS.
Here's a few things to try:
1. see if you can borrow another monitor just to be sure your monitor isn't the problem.
2. in System Prefs, and the Displays pane, click on the Detect Displays, then then the Gather Displays. If you get two diffenet display panes, that would lead me to think it's a monitor problem.
3. Lastly, disconnect your 2nd display, and restart. Then Shutdown, reconnect it, and see if that helps.
and of course..
4. make sure that all of your connections and adaptors are tight.

External monitor resolution problems with Mountain Lion

I have a problem with my external monitor (Samsung LS19B150NS) and Mountain Lion (running on unibody Mac Mini). Each time I reboot OSX the resolution get reset from native 1366 x 768 to something lower. The display is connected via DisplayPort-to-VGA adapter. Some observations:
- I tried selecting "Best for..." option or "Scaled" (set on 1366 x 768 or 1360 x 768). The problem is still there
- Sometimes resoltuion might stay alright for several reboots, but then the problem re-appears again
- Sleep mode doesn't reset resolution
- Other monitors work fine via the same adapter
- The Samsung LS19B150NS work perfectly well with other Win PCs
Any suggestions how to fix it?

I have a problem with my external monitor (Samsung LS19B150NS) and Mountain Lion (running on unibody Mac Mini). Each time I reboot OSX the resolution get reset from native 1366 x 768 to something lower. The display is connected via DisplayPort-to-VGA adapter. Some observations:
- I tried selecting "Best for..." option or "Scaled" (set on 1366 x 768 or 1360 x 768). The problem is still there
- Sometimes resoltuion might stay alright for several reboots, but then the problem re-appears again
- Sleep mode doesn't reset resolution
- Other monitors work fine via the same adapter
- The Samsung LS19B150NS work perfectly well with other Win PCs
Any suggestions how to fix it?

Mountin Lion has trouble with external monitors

Not so much a question as a shout-out. Since going to Mountain Lion, my pretty new (February this year) MacBook has been having no end of trouble with external monitors. I use it a lot with the clamshell closed with two different external monitors of two different sizes, one at home, one at work. It sometimes thinks the one is the other, or if I unplug the monitor in sleep, when I later open the clamshell, the screen stays black and I have to force a reboot with the power button. Never had these problems with exactly the same set-up in Lion. Sometimes it also refuses to find a connected monitor or projector, I have to pull the dangle and put it in again.

If memory serves, one of the 'flaws' with BM's hardware is that it will not convert on-the-fly. So if your sequence doesn't match what the TV is accepting, you get black.
For example, my TV will not accept 1080p, only 1080i, so working in a 1080p sequence would produce no image for me as the BM will only output exactly what's in the sequence, it can't convert my 1080p/24 sequence into 1080i/30 for output.
Now I'd expect your TV would have no trouble accepting a 720p signal but, maybe the above data will lead you down a path of investigation.

After updating to Lion my external monitor no longer works!

I used a external lcd tv to use split screen on my Macbook Pro. After updating to Lion this week it no longer works. First I thought it was my HDMI adapter but I have replaced it and nothing is still working. I've read that people using more than one problem have been having issues but i just have the one external monitor. Help Please!

I found a discussion thread here which seems to do the trick. Like you I've authorized, de-authorized etc, but renaming the files seemed to be the only thing that worked. Here's the detail:
https://discussions.apple.com/thread/3477094?start=0&tstart=0

Can't use only the external monitor, leaving macbook open on Lion

HW
macbook pro 15-inch, Early 2011
external samsung monitor, attached using HDMI to Thunderbolth adaptor
Previous Situation
With Snow Leopard I was able to keep the macbook screen open but turned off and use only the external monitor. This way I was able to use the front camera to make conference having everything only in the external monitor.
Current Situation
With Lion as soon as I open the macbook monitor the image splits between the two monitors and I'm not able to set the extenal one as only one.

Support today quoted Apple's engineers as saying it is "expected behaviour" under Lion for the MBP's internal display to reactivate upon opening the lid, even if you want to use only your external display. A new version of the clamshell mode-related knowledgebase article (replacing HT3131) is due shortly confirming this.
This is despite:
- the obvious temperature-related benefits that were achievable (under Snow Leopard) by opening your MBP lid whilst continuing to output solely to, say, a 27" cinema display
- potential wifi connectivity benefits of having the lid open
- the waste of energy and inefficient use of graphics processing power in needlessly running two active screens (ie if running your MBP in clamshell mode would otherwise make it too hot and/or noisy or you need it open for wifi)
- the negative longer-term impact on the battery and other components from running the MBP any hotter than it needs to be.
To have any hope of getting the previous behaviour back, we need to lobby Apple to change how Lion handles clamshell mode. Options available to them include changing Lion's expected behaviour or adding a user-selectable option within System Preferences.
If you haven't already submitted feedback, please do so below. Now the situation has been clarified as intentional, user feedback has become all the more important.
http://www.apple.com/feedback/macosx.html

Is anyone else experiencing frequent blackout problems on an external monitor in Mountain Lion?

Is anyone else experiencing frequent blackout problems on an external monitor in Mountain Lion? I called Apple Support and got a temporary fix by removing preferences, but frequent --several second-- blackouts are back. Will an HDMI cable alleviate this?

I have been experiencing this, but with Lion, not Mountain Lion. It is driving me nuts!
I am using LG L246WP monitor via HDMI to DVI on MacPro1,1. I have tried changing cables, even tried VGA to DVI (no blackouts with VGA, but not sure I can trust that, because there is no set pattern of when it will blackout!).
I did try another monitor for most of a day - no blackouts/flickers, and as soon as I hooked up my original monitor, I got blackouts, which led me to believe it is the monitor.
I have searched and read several forums on blackouts, each with different configurations, so at this point I am not sure what it is. I even replaced my Graphics/Video card, because someone on Apple forum said most likely that was the culprit, but still having same problem (even as I type this!).
It is like something is intermittently interfering with signal???

Lion, external monitor, and wake from sleep - please help!

For the most part I love Lion. However, the changes they made to the external monitor support are not helpful for me. Let me explain...
I have a 13" 2009 MBP. In my office I use a monitor stand that the laptop can slide into from either the left or the right, and the monitor sits on top. Previously I would simply take my closed MBP in sleep mode, slide it under the stand, and plug everything in. Once the power cord and monitor cable were plugged in, as soon as I inserted something into the USB or SD-Card slot (or I think even the ethernet jack) the laptop would wake from sleep and the monitor would come on.
Now, however, this doesn't happen. My only option is to plug everything in, open the laptop so it wakes up, then close the lid, then slide it into the stand. This is definitely NOT an improvement! Before I had my phone at the left of the monitor stand, and would slide the laptop in from the right. Now, though, I have no choice but to slide it in from the left (after going through the above hassel), which means I had to move the phone off of my desk.
The energy saving preferences have the "wake on network access" box checked, which would make me think that it would wake up as soon as the ethernet cord is plugged in - but no such luck. I also have wireless in the office, but it's hard for it to recognize that when it's in sleep mode.
Has anyone else had this problem? Is there a solution I'm missing here? I'm using a wireless keyboard and wireless mouse, so of course those won't do anything while the computer is asleep.

I'm beginning to hate Lion because of this one problem. It's great that Lion doesn't sleep when you close the laptop with external monitor connected. But I can no longer wake the external monitor with USB mouse movement. I have to open and close the lid. This is very inconvenient when switching between two systems with KVM. The MacBook is awake; it just won't wake the monitor.

Overlapping wallpapers on external monitor w/mountain lion

When I close the lid on my early 2011 Macbook Pro with my external monitor pugged in via a thunderbolt to displayport adaptor, the wallpaper from the macbook overlaps the different wallpaper on my external monitor. This has only started to happen after upgrading to Mountain Lion. Any ideas on how to fix this?

I have been experiencing this, but with Lion, not Mountain Lion. It is driving me nuts!
I am using LG L246WP monitor via HDMI to DVI on MacPro1,1. I have tried changing cables, even tried VGA to DVI (no blackouts with VGA, but not sure I can trust that, because there is no set pattern of when it will blackout!).
I did try another monitor for most of a day - no blackouts/flickers, and as soon as I hooked up my original monitor, I got blackouts, which led me to believe it is the monitor.
I have searched and read several forums on blackouts, each with different configurations, so at this point I am not sure what it is. I even replaced my Graphics/Video card, because someone on Apple forum said most likely that was the culprit, but still having same problem (even as I type this!).
It is like something is intermittently interfering with signal???

External Monitor in Lion

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