Improper change to clamshell mode

MBA, no bluetooth devices, on Wifi, no external keyboard or mouse. External monitor connected through Thunderbolt. USB devices: external hard drive, NeatWorks scanner. Behavior: when the lid is closed the MBA switches to clamshell mode (external monitor shows desktop). Expected behavior: go to sleep. Any ideas?

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How to change the Slate/Clamshell Mode

Hi,
I want to change this device to Slate/Clamshell Mode in our desktop app.
http://software.intel.com/en-us/articles/detecting-slateclamshell-mode-screen-orientation-in-convertible-pc
Can we send any APIs ? or?

We have no public interface to forcefully change the system state to Slate/Clamshell Mode from an application. The mode is controlled by hardware only.
Why do you want to change the mode from your desktop app?
This posting is provided "AS IS" with no warranties, and confers no rights.

Clamshell Mode Has Changed?

Okay, So I am enjoying Lion very much, it's a pretty sweet upgrade. However, I've run into a big problem and it's a feature I loved in Snow Leopard and it works under Windows 7 (BootCamp) as well, In Windows 7 I can just easily choose what Display I want to use, why Mac OS X doesn't have this feature is beyond me.
So I'd go through putting my Macbook Pro into Clamshell mode, and wake it with the Apple Keyboard, but after I've turned the Macbook back on, I'd open the lid to help keep my MacBook Pro running cooler, this was when I was on Snow Leopard...Now in Lion, everytime I open the lid the built-in display turns back on!
MacBook Pro 15" it's the model with the Thunderbolt Port, and the external monitor is using HDMI.
Anyone know of a solution to turn off the Built-In Display like Snow Leopard did?

I also have the same problem. There were big operating temperature improvements to be gained by running the MacBook Pro in clamshell mode with the lid open (but the in-built screen still turned off) as opposed to closed whilst using a 27" LED external display under Snow Leopard. Other uses have reported performance improvements, too.
The instructions for how the internal display is supposed to behave whilst in clamshell mode remain unchanged here (last updated May 2011): http://support.apple.com/kb/HT3131?viewlocale=en_US
I have just upgraded to Lion and am appalled to discover that I can't now open the lid of the MBP without the display springing to life. I neither want nor need two displays live at once!
Apple: PLEASE provide a fix so that the display setup behaves like it used to under Snow Leopard. It's summer time and I have no aircon, so this is pretty urgent from my point of view!

MacBook late 2008 - stuck in clamshell mode

This laptop was recently attached to an external display and all was fine - running in either mirror or non-mirror mode. When I last saw it it was set to mirror mode and the lid closed to effect "clamshell" mode.
Recently however it has got into a state where the built-in screen display is not recognised. The external display is OK. If the external display is disconnected the MacBook will go to sleep regardless of the lid being open or pressing keys etc.
On a reboot the laptop screen will show everything OK up until a few seconds after completeing the login phase - then it goes black.
There is a lot of chatter in various forums about sleep issues but I can't see much about this particular variation. I've spent several hours scanning through these discussions and general Google searches.
As I say in the title - the symptoms appear to be that the firmware believes the lid is closed and hence the OS X software, such as display preferences, gets locked out from accessing the display after startup is complete. If the OS decides there is no display present it puts the MacBook to sleep.
I have reset the PRAM and SMC, rebooted in Safe Mode, deleted the display preferences plist file, run the Apple Hardware Test - all with no change to the symptoms.
Hass anybody reading this observed the same symptom and noted a method to fix it?
Thanks,
Graham

I had a similar issue where my Late 2008 Macbook would get stuck in closed clamshell mode after connecting and disconnecting an external display, or just closing the lid. Only rebooting the machine would bring back internal video.
External video continued working via the mini displayport, but the internal display would stay black no matter if the external display was connected or not. I was also unable to adjust the display brightness from the internal keyboard, pressing the F1 and F2 keys had no effect (even while holding fn key). Resetting PRAM and SMC had no effect.
I resolved all aforementioned issues by replacing the HDD Bracket with IR/Sleep Cable. This can likely be done fairly cheaply at a local Apple Store.
I might suggest first having the HDD Cable and or IR/Sleep Cable reseated on the main logic board, before replacing anything.

HT3131 Why doesn't Apple mention using the Display control panel's "Arrange" feature to move the menu from the Macbook's display to the EXTERNAL display? THAT'S the real answer to make Clamshell mode work, but it's not mentioned in any Apple documentation

After a recent OS update, Clamshell mode quit working. I couldn't find any Apple documentation
that would help. So many people were stabbing around in the dark, until I finally found the following information
that is lacking from any Apple documentation that I've been able to find.
Here's what I found to be the most helpful:
Forcing a MacBook to use the External Monitor:
I tried about everything: Rebooting, switching off completely, removing and inserting the Thunderbolt->HDMI adapter etc.
The only thing that finally worked was the following:
1. Take it out of the dock and connect to Power and HDMI to the TV.
Shut down the Mac. Turn it on and close the lid. It will now boot up on the external screen.
Log onto the Mac, and put it in sleep mode (Option-Command-Eject).
Put it back into the dock and wake it up with the spacebar.
It should be OK now... until the next update...
Note: One indication that you’re going to have extreme trouble with this is when (occasionally and without reason) the Mirroring Options icon shows up on the top icon bar.
Other useful commands:
“Command + F1” puts PC in Two-Screen MIRROR mode.
If it’s REALLY being stubborn, do the following (Clamshell Must be open
to see the arrangement tab.):
In System Preferences > Display on the MacBook screen there should be an Arrangement tab when you have the MacBook hooked up to the TV and both screens working. When you click the Arrangement tab do you see two monitors side by side? One of them will have a Menu Bar at the top. Just click on the Menu Bar and drag it to the second monitor (Yes, I know, it’s hard to grab ahold of it...) That will make your EXTERNAL monitor your main screen.
You can now use your MacBook in Clamshell Mode with a wired or Bluetooth keyboard and mouse. http://support.apple.com/kb/HT3131 When you disconnect from the TV, make sure it’s asleep (Option+Command+Eject buttons) or your Menu Bar will automatically change back to the MacBook.

After a recent OS update, Clamshell mode quit working. I couldn't find any Apple documentation
that would help. So many people were stabbing around in the dark, until I finally found the following information
that is lacking from any Apple documentation that I've been able to find.
Here's what I found to be the most helpful:
Forcing a MacBook to use the External Monitor:
I tried about everything: Rebooting, switching off completely, removing and inserting the Thunderbolt->HDMI adapter etc.
The only thing that finally worked was the following:
1. Take it out of the dock and connect to Power and HDMI to the TV.
Shut down the Mac. Turn it on and close the lid. It will now boot up on the external screen.
Log onto the Mac, and put it in sleep mode (Option-Command-Eject).
Put it back into the dock and wake it up with the spacebar.
It should be OK now... until the next update...
Note: One indication that you’re going to have extreme trouble with this is when (occasionally and without reason) the Mirroring Options icon shows up on the top icon bar.
Other useful commands:
“Command + F1” puts PC in Two-Screen MIRROR mode.
If it’s REALLY being stubborn, do the following (Clamshell Must be open
to see the arrangement tab.):
In System Preferences > Display on the MacBook screen there should be an Arrangement tab when you have the MacBook hooked up to the TV and both screens working. When you click the Arrangement tab do you see two monitors side by side? One of them will have a Menu Bar at the top. Just click on the Menu Bar and drag it to the second monitor (Yes, I know, it’s hard to grab ahold of it...) That will make your EXTERNAL monitor your main screen.
You can now use your MacBook in Clamshell Mode with a wired or Bluetooth keyboard and mouse. http://support.apple.com/kb/HT3131 When you disconnect from the TV, make sure it’s asleep (Option+Command+Eject buttons) or your Menu Bar will automatically change back to the MacBook.

External Display won't work in clamshell mode

Hi - I can't get my external display to work with the MacBook in clamshell mode - It works fine with the lid open.
I'm using it with the apple bluetooth keyboard and mouse.
I've obviously changed a setting without realising - can anyone help.
Thank You.
Ash
MacBook Pro (15-inch, Mid 2010)
Mac OS X 10.6.8

Sorry - I've now got it to work.
I don't know how - I just went through all the settings one by one, switched them off and back on again and it now works - I have to assume it is 'user error' but I can't work out which bit

Solution to Closed-Clamshell Mode in Lion

Hello all!
Lion has changed to default behavior of the internal screen from the old functionality in Snow Leopard. Previously, in SL (Snow Leopard), a Mac with an internal screen could be connected to external mouse, display, and keyboard and be ran with the external as the primary monitor WITH the laptop screen open. It is important to keep the screen open on laptops to release heat. Here are the steps to restore this functionality in Lion:
I have found that this command in Terminal restores Snow Leopard functionality in Lion to closed-lid/clamshell mode.
1. Open up Terminal in /Applications/Utilities
2. Type the following command: sudo nvram boot-args="iog0x0"
3. Press return
4. You will see a warning about using the sudo command. PLEASE make sure you typed the command into Terminal correctly. Mispelling sudo commands can be... dangerous.
5. Type in your password to confirm and press return.
6. You should see Terminal move to a new line.
7. Restart your Mac and the Snow Leopard functionality should be restored!
Note: Resetting the PRAM will erase this modification. If you are ever told by Apple to reset the PRAM or need to do so for another reason, you will have to repeat these steps again. The mod holds as long as the PRAM is kept intact!

hi Luke20333,
Thanks for the info, really appreciated it!!
But I think there's a little mistake in your instruction. It didn't work for me at first, but with a little googling I found the one that did the trick:
instead of:
sudo nvram boot-args="iog0x0" (step 2 of your instruction)
I used:
sudo nvram boot-args="iog=0x0" (= sign between iog and 0x0)
Now I can close the lid of my MacBook without having to think if it's connected to an external monitor or not. Much more natural, like what we expect from Apple products...

Problem using clamshell mode with 2010 Macbook Pro

I'm trying to use my mid 2010 Macbook Pro in clamshell mode with my Sanyo TV as a monitor. I have an external keyboard and mouse and I keep it plugged in when trying to do this. I have tried with mirrored and seperate displays, both with the TV as secondary and primary display, and whenever I close the lid the TV suddenly says that the input resolution has changed and is out of the range of the TV. I have tried changing the resolution on both the TV and computer when both displays are active and it has made no difference. Is there a way to make this work or a way to keep the computer from changing the output resolution when I close the lid?

I have discovered that the issue is that the computer won't wake from sleep mode. I still have no idea what the problem is but it also occurs if I put the computer to sleep with the display open.

Clamshell Mode source resolution problem

I own a Macbook Pro with Mountain Lion, and I have used my laptop in clamshell mode once. After i changed the resolution to see which would work better with my Philips tv, I have never been able to use CS Mode again. I am unsure if it is a computer issue or the tv.
I'm able to mirror displays and everything works great, but once I close the laptop to use CS Mode the tv says "Change source resolution". I have tried every resolution available in the scaled tab, and none seem to work.
HELP please!

I was having the same problem. I figured out that when I closed the lid my macbook was changing the resolution for the external to something that the monitor couldn't handle. I used VNC to remote into my computer and change the display manually - after that all was well. The monitor displays fine in clamshell mode now.

Clamshell mode in bootcamp not "sticking"

MBP 15'' with bootcamp.
Latest Bootcamp drivers installed
Minidisplayport-to-DVI adapter in.
I open the laptop. boot Windows, I see the image on the laptop screen AND on the external monitor. When I'm at the "ctrl-alt-del" screen I try and close the laptop to go into clamshell. No dice.
I open it again, log into windows, wait for all the systems to start, try again. Nope.
I open it once again, go to "Control Panel", then "Change what closing the lid does", I change NOTHING (the setting is already on "do nothing"), click "apply", then close the lid and voilà... clamshell mode.
It's getting on my nerves... any chance someone had the same problem?
Thank you

I had clamshell mode working under Windows 8.0 Enterprise on my 2015 MBP 13 Retina. I could close the lid while running Windows 8.0 and then wake up the MBP using the Apple Bluetooth keyboard and it would drive the two connected external HD monitors.
I've upgraded to Windows 8.1 Enterprise and the wake from sleep in clamshell mode no longer works with the Apple Bluetooth keyboard, trackpad or mouse. I've just used worryingroadworrier's suggestion and I can close the lid and the MBP now drives both the connected external HD monitors while the lid display remains off. Wake from sleep using the keyboard, etc., still doesn't work but my goal was to be able to use both external displays.
Thanks to worryingroadworrier and also thru_the_loop (on http://www.mac-forums.com/forums/running-windows-anything-else-your-mac/222848-h ow-get-clamshell-mode-windows-7-macbook-…) for their suggestions.

HT3131 I want to have my macbook Pro desktop on my monitor, like clamshell mode, but is clamshell the only way?

Hello people,
I have a 13 inch Macbook Pro. I am using my old monitor, and it works fine! I wanted to have the menu bar on my monitor as well, and I found out about clamshell mode. I plugged in my keyboard and mouse, and it worked like a charm. Everything was at a normal size and at pretty high quality! However, my keyboard recently stopped working and I don't want to get a new one. Is there a way I can change my display settings to match that of clamshell mode without actually going into clamshell mode? Thanks!

Clamshell without the clamshell? Kinda oximoronic, dont'cha think?
Given that you want the primary window to be the external monitor, "bless" it by opening System Preferences / Displays, arranging the layout of both displays as desired (yeah, both WILL have to be on) then click and drag the mini-menubar on the square representing the internal display onto the other one.

Clamshell mode messed up...

I use my macbook pro running Lion in closed lid clamshell mode with external keyboard, mouse and monitor all the time. There was a recent change in my logic board with a similar config one cause of problems with the USB.
When I open the lid it takes a lot of time for it to redetect the internal led display. they keyboard and the trackpad also dont function. when i unplugg the mini displayport it almost always doesn't detect the internal display again. keyboard and trackpad are also left non functioning.
when i unplug everything and reboot, it tends to power on the display, but as soon as the login window appears it goes blank. the internal keyboard and trackpad are unable to bring it up again. if at this point i connect my external diplay it works fine!
can someone tell me if this is some bug in lion or if this is my new logic board. incidently i started using an external configuration from the day my new logic board was fitted in. so i'm not sure of this was the same problem with the older one, thus am not sure if this is a logic board problem at all.
kindly advice.
Neerav

You need to have it looked at.
Whether or not you have an external display, keyboard or mouse connected when you open the lid all part of the MBP should work. Displat should come on (that is why there is clamshell mode. The only way to turn off the internal display) and the internal keyboard and touchpad should aways work even if the lid is closed (if you could get to them with the lid closed).
I believe it works on a magnetic switching system. Basically the same switching system used to put the unit into sleep mode when there is no external keyboard or display attached even if you have a mouse attached and it is running on battery or AC power. When you close the lid the unit goes into sleep mode. That same switch is used to set the system into clamshell mode when there are all those other prerequisites attached.

Clamshell mode slow internet... am adding a video proof about it...

For the past few months I have been constatnly calling up my ISP to check if there is something wrong with their service. My internet speed is slow. Some times as slow as 5% the promised speed. I'm on a 10 mbps plan which should give me a cool 1.2 mBps (notice the capital B). whenever i feel there needs to be a test, i simple make a download off itunes podcast. Before i started using it in the clamshell mode it used to give me a full 1.2mBps!! Then, it began to fluctuate to abour 200 to 400 kBps. on non apple sites, even as low as 100kBps!!
i even changed my router and was about the buy a third one! but then, the ISP engineers made me plug in the mac direcrly to the ethernet port, and everything ran fine! so it was ruled out that there was anything wrong with the service. also, since two of my routers from differend manufactureres showed the same performance, the problem with the router was also ruled out. then i booted my old toshiba machine running vista and it ran fine too.
While searching for a comparision for the macbook pro in clamshell and an iMac, i came across this thread...
https://discussions.apple.com/thread/2175385?start=0&tstart=0
so i decided to run a test with podcasts again and check the speed. this time i leveraged on qt x's screen recording ability and decided to post here. it turned out to be true! the clamshell mode is causing problems with the internet speed. check this video out yourself...
http://youtu.be/zx9S96JFXm4?hd=1

apple care pointed me to this link...
http://support.apple.com/kb/HT1365

Silverlight (Lovefilm / Netflix) MBP 13" Early 2011, Heating and Exhaust Problems, Clamshell mode with TB Display

Hi all
I was hoping if someone can help me out...
I have a:
Mac Book Pro 13" (Early 2011) (i5, Crucial 8GB RAM, 120 OWC 6G SSD)
Apple Thunderbolt Display
I run my MBP in clamshell mode always.
Whenever i run Netflix or Lovefilm video in full screen using either Firefox, Chrome or Safari. The Silverlight plug-in is hogging the CPU.
My exhaust (CPU fan) goes crazy, its soo loud its annoying while your trying to watch a movie on your Thunderbolt Display.
Temperature reaches: 83 Celsius
Fan (Exhaust): 5620 - 6200 RPM (immediately jumps from 2001 to 5620 / 6200)
If i watch a movie full screen on my 13" MBP with my Thunderbolt display disconnected:
Temperature reaches: 81 Celsius
Fan (Exhaust): 3198 RPM (it slowly crawls up form 1998 to 3193)
Now i changed my resolution on my Thunderbolt disply to 1420x720 and it helps with the fans going crazy, they slow down slightly...
I've tried a PRAM and SMC Reset, all my firmware is up to date.
My Macbook Pro is slightly raised at the back so air can flow through the vents.
My FANS are just going crazy!! something is ridicously heating up internally in my machine causing them to go mental.
You just cannot watch a movie on netflix or lovefilm on your thunderbolt display comfortably if your fans go beyound 2800RPM.
I even installed Windows 7 on Virtual Box and tried running lovefilm / silverlight and it did not help my problem.
PLEASE CAN SOMEONE HELP! how can i keep my fans below 2800 RPM while running silverlight?!?!

Flash like Silverlight are CPU heavy applications.
The MacBook Pro can be run in clamshell mode but only when not running extremely CPU intensive tasks
like what you are doing.
If you keep the mac book running this way for too long you might stress the materials and run into danger of getting thermal damages.
Chrome is actually in recent time getting very slow and I noticed in a comparision test that Firefox provides me up to 30 to 40% more free CPU time.
If running netflix I would suggest currently NOT using Chrome.
Windows 7 virtualized inside virtual box and then on top netflix is uhm a pretty bad idea because all those three things together are already CPU hogs.

Can no longer use an external display in closed clamshell mode

Hi,
I have this weird problem that just started couple days ago.
I own a MacBook Pro Early 2011 since March.
It's always hooked up to an external display and the MacBook Pro's LCD is turned off (closed clamshell mode).
Lately, if the MacBook Pro's LCD is turned off, the external display won't show anything.
But as soon as I open the lid, the external display will then mirror the MacBook Pro LCD.
If I close back the lid, the external display will get blank.
I also tried to change the display settings with no luck.
In other words, I can no longer use my external display with the MacBook Pro in closed clamshell mode.
I'm wondering if someone experienced this problem before. Thanks for help.

Hello sebastieng
Open both, your MBP connected to the external screen. Open Preferences click here on "Displays" and then make the external Window to the main window by dragging the bar (line?) on top of the laptop window to the external window, which makes the second window the main window.
If this does not help you may read this:
http://support.apple.com/kb/ht3131
Hope this helps
marek

Improper change to clamshell mode

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