MBP Clamshell Mode via DVI LG Monitor

Hi
I know this one has been done to death but.......
I have a MBP 2.2SR and yesterday I got a LG 22" monitor. Originally I tried to connect via DVI, usual process
Ensure MBP is connected to the mains
Connect Display
Ensure Keyboard is working
Close Lid on MBP
Use space bar to wake up.
This doesnt work, the screen is in MBP resolution and not the LG screen and after a couple of seconds it goes to sleep.
However, I have tried a DVI to HDMI cable and this works fine.
Problem is I also want to connect my iMac to my LG display (2nd screen), again by DVI and this will not work.
Any ideas?

So the DVI input is not working when attempting to drive it by either the MBP or the iMac? That sounds like a problem with the LG's DVI input if it isn't working with two different Macs. Either that or the DVI cable is bad (even more likely).
You are switching the LG to the DVI input, correct? Or does it auto-switch between inputs depending on if it detects the presence of video or not?

Similar Messages

  • MBP Clamshell Mode - DVI to TV Adapter - Front Row Works - But No Video?

    Hi all,
    Have picked up an Apple DVI to TV adapter for my MB Pro. Have successfully got it to work in clamshell mode displaying Front Row on the TV without the external Mouse or keyboard.
    However, it will not play videos or movies on the TV.
    If I keep the lid open, it will play the video/movie on both displays as hoped. However, when I close the lid, all other Front Row stuff works - but no video picture! Is this some sort of overlay issue? How can I fix this? I do NOt want to burn my LCD when using it this way - would be a waste.
    Please pass on any thoughts!
    Thanks,
    Stu

    I also have this exact same problem. A little annoying since I have just spent $A35 on the mini dvi to dvi adapter and another $A50 on a good quality DVI cable. My LCD tv is set to millions of colors so that is not the issue.
    I have a 2.0Ghz Core2Duo Macbook. A quick google search If anyone knows how to fix it I'd be very grateful.

  • Disable clamshell mode via Terminal

    Hi everyone.
    Is there any way to disable "clamshell mode" and avoid my MacBook Pro waking up seconds after I close the lid?. I always use my MBP17 with a magic mouse, usb hub, external monitor and plugged magsafe but using both screens at the same time. I just would like to close the lid and enter sleep mode while I go away from my mac for five minutes without having to unmount drives, unplug magsafe and turn off mouse. It's crazy!!. I still can't believe there is no preference for that.
    I know thats the wanted behaviour for using the external display with the macbook screen off but I just wanna send my mac to sleep for God sake!!
    Thanks in advance and excuse my poor english.

    Your English is much better than that of some native English speakers who post here.
    Your MBP's waking up immediately after being closed, without your doing something to cause it, is *not a feature of clamshell mode.* In clamshell mode, the expected behavior is that the machine will sleep when the display is closed, and you will then wake it and bring the external display into operation *by pressing a key on the external keyboard.* If you don't do that, it stays asleep. So clamshell mode doesn't need to be disabled to stop the behavior that's annoying you, because that behavior has nothing to do with clamshell mode.
    Instead, you need to determine which of the devices you are using with the MBP is interrupting sleep. This is nearly always caused by a USB device that doesn't understand sleep, and tries to communicate with the computer while it sleeps — which causes it to wake up. It may be your keyboard, your mouse, an external drive, a printer, scanner, ExpressCard device, Bluetooth cell phone, or even an SD card in the built-in card reader, if you have one. So first turn Bluetooth off and close the display to test for a change in behavior. If the MBP still wakes up a minute later, that wasn't the culprit. Disconnect your other peripheral devices one at a time, testing again after each disconnection, until you discover which device is responsible.

  • How do I connect a camera to my macbook pro when using the computer with an external monitor in clamshell mode?

    How do I connect a camera to the Macbook Pro when using the computer in clamshell mode with an exrternal monitor?

    same as it ever was
    do it like nothing is different.
    be sure to have an external trackpad keyboard or mouse as you will loose them on the computer once it is closed.

  • External display (via DVI) takes 10 minutes to turn on

    Hi!
    We have a 15" G4 Powerbook about 16 months old. We often use it with an external (non-Apple) LCD monitor, in dual mode, via DVI. For most of the time we've had the PB, there was no problem at all. However, in the past few months a puzzling problem has developed. When the monitor is plugged into the PB's DVI port, the PB will believe there are two monitors available but it will not send any signal to the external monitor at first. After about 10 minutes, it will suddenly start sending a signal to the external monitor and everything is fine. However, if the PB subsequently is allowed to go into sleep mode, upon resuming it again refuses to send a signal to the external monitor for about 10 minutes.
    Any idea what is going on and how this might be fixed? It's really frustrating.
    Thanks!
    G4 AlPB 15"   Mac OS X (10.3.3)  

    I think I have this problem as well, I keep using the PB with LCD projectors, again they are detected, but I can't get an output.
    Not sure I get anything after ten minutes though, I'll leave it today to try it.

  • Clamshell mode does not work with Mountain Lion.

    Installed Mountain Lion on 11" MacBook Air last Friday night.  Now system does not appear to work in Clamshell mode, as it won't wake or connect to external monitor.

    Apple Tech Support was very helpful.  The MBA works in clamshell mode next to my monitor now -- but does not work in the Henge Dock.  Henge Dock has been contacted.

  • HT3131 Operating MBP in closed clamshell mode with external display

    I have a new MBP retina display.  Trying to operate in a closed clamshell mode.  I connect a USB keyboard and a wireless mouse.  My external display is a Dell 2007FP display screen connected via a VGA adapter.  Whenever I close the computer lid to operate in clamshell mode the screen goes to sleep/power save mode.  Have tried various combinations of attaching keyboard and mouse first then screen, switching computer off on etc.  The external display states there is "no signal coming from computer"...any suggestions/advice would be greatly appreciate

    Congratulations on taking one more step in becoming more self sufficient in tech stuff.
    But I have to wonder why you spent so much on a Retina display only to have it cooking uselessly there.

  • Can I use an external monitor/clamshell mode PERMANTENTLY?

    What I'm trying to do is take my old TiBook 550 with its malfunctioning screen and busted hinges (grrrr) and effectively turn it into a low-budget version of a Mac Mini i.e. hook up a USB keyboard and LCD monitor to it and use it as if it were a desktop.
    Now I have successfully attached the monitor and keyboard, turned on video mirroring etc. and it's all working fine. No problems with getting the thing to work. The only problem is I am having to keep the PB screen open slightly so that I can shut down and boot up for each session (for various reasons I don't want to leave it in sleep mode). Even though I bought a keyboard that has a USB power button on it, I am still unable to use it to boot up (I can shut down though).
    As I understand it 'clamshell' mode only allows you to put the computer to sleep, so is there any way I can permanently tell the PB to ignore the on board LCD and only use the external display? My ultimate goal is to just have the PB sitting out of the way, lid closed (or lid removed??), whilst I use the keyboard and external display PLUS be able to shut down and reboot without having to prise open the screen, which is now quite damaged. Any ideas? TIA.
    Powerbook G4 15 1.5Ghz   Mac OS X (10.3.8)  

    Hi there,
    I think you're right - Shutting down works via the keyboard but not Boot Up. It's weird because I'm sure I remember being able to do this once in the dim and distant past but maybe I'm wrong.
    Anyway I've now hooked up my old laptop so that the screen is held ajar so I can reach the power button. After some research, I found out that the laptop should not be used with the screen closed for long periods anyway because of heat issues so this inelegant solution is probably the best in terms of keeping the temperature down.
    Now what I need is some safe way of permanently disabling the display so that ONLY the external monitor works. If there was some way of doing that, at least I would not be wasting energy powering the original LCD. So far I have been able to disconnect the cable on the back of the screen that sends the 'data' to the LCD, but I've not yet been able to disable the back light.

  • Clamshell mode w/external monitor broken in 10.8.2

    Ever since I made the .2 upgrade in mountain lion clamshell mode does not work with my MBPro 8,2.  Previously in Lion and Mountain Lion clamshell mode worked fine, I even executed the following terminal command so I could open the lid without the internal display turning on (sudo nvram -d boot-args).  Now when I wake the computer from sleep with the lid closed, mouse and external monitor plugged in, I get to the login screen, the desktop will flash and then it will go back to sleep again.  The only rememdy is to open the lid, but then my terminal command isn't working and the internal display turns on.  This is most frustrating.  Any help is appreciated.
    Curt

    Thanks for the snarky reply.  I know how to do a search, you'd assume if I'm smart enough to try a terminal hack I knew how to use a web page search box.
    It looks like every discussion on the clamshell issue gets mysterious "closed," "helped" or "answered" when indeed there is no real solution, including the thread you linked, hence my new topic.  So I appreciate the help. </sarcasm>
    This is a real problem and I wish I could be shocked at Apple's response.  I use Win7 in bootcamp for work, it is so trivial to turn off my internal laptop display or work in clamshell mode.  In the rush to get out Facebook integration and shared photo streams Apple really let this bug through in the update?
    Back to my issue, it doesn't matter what monitor port I use (VGA or DVI) clamshell mode doesn't work.  Turning off the internal display obviously doesn't work when connected to an external monitor.  Contrary to your link (and many other threads) this problem (clamshell mode or turning off the internal display when an external is attached) still exists.  It worked in 10.8.1, it doesn't in 10.8.2.

  • Clamshell mode and mouse not working on external monitor

    Suddenly I notice that when I put my MBP (late model 2008, Lion) in clamshell mode, my blue tooth mouse and wireless keyboard become unresponsive
    I think the MBP has frozen but its only that the mouse and keyboard do not respond.
    I have to open the MBP in order for the mouse to work so I can work using the externa (Apple 24" monitor).
    This just started happening.
    Has anyone experienced this?
    Just started happening as of yesterday March 19. I cannot think of anything new I downloaded. Rebooting did not seem to help.

    Hello GeneHall01,
    Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
    I understand that you are having issues with your HP Pavilion p6620f Desktop PC not booting up correctly. I am providing you with an HP Support document: Troubleshooting Power Supply Issues, which will walk you through the troubleshooting steps need to diagnose issues with the power supply. Additionally, it will lead you to additional documents depending on the steps lead you to assist with other issues that can prevent your computer from starting up correctly.
    Please re-post if you require additional support. Thank you for posting on the HP Forums. Have a great day!
    Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
    Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
    Dunidar
    I work on behalf of HP
    Find out a bit more about me by checking out my profile!
    "Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

  • In clamshell mode, must I connect to a monitor?

    I just got a keyboard, and I was told that when attached, if I closed my macbook, it would either just go into clamshell mode, or ask.  I connected to a TV via the DVI adaptor and when I closed the macbook, it just said, no signal.  Keyboard & mouse do work when macbook is open.  Thanks for your help.
    Terrie

    Wake the computer up by pressing a key on the keyboard or a button on the mouse.
    (61717)

  • How to switch on MacBookPro monitor instantly after being in clamshell mode

    So I use Skype Video a lot, and I use a Samsung external monitor.
    The problem is that I have my MacBook in Clamshell mode nearly all the time, and at the moment, when I get a Skype video call, all I can do is open the screen on the MacBook and just have a black screen, (all video goes to the Samsung) so that when I want to look at the person I am talking to, I have to look away from the camera because the MacBook sits to the side of the Samsung.
    My question is, how would I instantly switch on the MacBooks screen when receiving a video call and then have the Skype Video immediately under the camera?
    Would this involve writing a script of some kind or does anyone know of any apps to download?

    I'm not sure that there's a reasonable fix for you. However, I would suggest that you use your MBP in a dual monitor mode. It gives you a ton more desktop space, and would immediately solve your problem. I use Skype video that way (although I have an Apple LED monitor, so it has an iSight camera on it).

  • Horizontal shifting bars on MBP 15 after disconnecting 24" LED cinema display and waking up from clamshell mode.

    I use my MBP 15 (late 2011) with 24" Apple LED Cinema display in a clamshell mode. After disconnecting external display, and opening display, it shows horizontal shifted bars, so it becomes completely unusable. Have to hard reset laptop. Any hints on how to resolve this? Thanks.

    Ok, more information for anyone that might care. The wake-up seems to be the familiar dark wake in order to go into hibernate mode. Except now, it's a death wake. Looking at the logs, I see that it happens exactly 70 minutes after sleeping, even though hibernatemode = 0 (which shouldn't hibernate at all!)
    So my power settings look like this:
    Currently in use:
    standbydelay         4200
    standby              1
    halfdim              1
    hibernatefile        /var/vm/sleepimage
    darkwakes            0
    gpuswitch            2
    disksleep            10
    sleep                10
    autopoweroffdelay    14400
    hibernatemode        0
    autopoweroff         1
    ttyskeepawake        1
    displaysleep         2
    acwake               0
    lidwake              1
    standbymode is 70 minutes, what a coincidence. I'm going to try setting it to 0 and see what that does.

  • Hi - How do I connect an HDTV as a second monitor to Thunderbolt display with macbook pro in clamshell mode?

    I have a Late 2011 Macbook Pro in clamshell mode connected to a Thunderbolt Display with the built in Thunderbolt cable. I want to then connect an HDTV via the Thunderbolt port at the back of the Thunderbolt display. I already had a  cable that I thought would work which turns out to be a MiniDisplay port to HDMI cable and therefore not compatible with Thunderbolt to Thunderbolt (Mini DisplayPort not being the same technology although it uses the same port - although I'm not an expert !!) So far a web search has provided me with the only solution being using a Thunderbolt dock or storage that has multiple Thunderbolt ports and then  using that to daisychain inbetween the Thunderbolt Diplay and the HDTV. The cheapest solution I can find for this would be about £250. Surely not ??!!!!
    Many thanks for any comments - Nik

    You could also use aThunderbolt dock with HDMI, such as:
    <http://www.belkin.com/uk/F4U055-Belkin/p/P-F4U055/>
    <http://www.caldigit.com/thunderboltstation/>
    <http://www.elgato.com/en/thunderbolt/thunderbolt-dock>

  • TV & monitor connected via DVI to VGA & DVI cable. Wont display

    I have my TV & monitor connected to my mini via DVI(input) to> VGA(output) & DVI(output) splitter cable. I cant get both tv and monitor to work at the same time only one or the other. How can I get this to work?
    Note: I dont want a continuous display, I just want one to show the same as the other. If there both plugged in why dont they both work?

    The answer to your question would require having a block diagram of the mini's graphics sub-system. If the DAC (digital-to-analog converter) behind the VGA port is just driven from the same output as the TMDS transmitter behind the DVI port, then I agree it would be possible that both could output the same screen simultaneously. But if the VGA and DVI ports are treated as seperate channels all the way back to video memory, then likely one would be prioritized over the other, only one could be active, and they would not be able to output simultaneously.
    Another potential problem is that TVs and computer monitors generally want to run at very different formats and they require different signal types to be happy. A TV will want an interlaced output whereas a computer monitor will not. And a TV will want a very low resolution, like 640 x 480, whereas a computer monitor will be happiest at a much higer resolution.
    I hope for you that someone else has this working and chimes in with some practical advice. I try to avoid making posts where I have no practical advice to offer and only bad news, but in this case I thought you might want to know about some potential barriers to success. Good luck.

Maybe you are looking for