Dual Monitors won't sleep

hi,
i just added an older cintiq 21ux to my mac pro. the other monitor is an acer h233h.
since adding the cintiq, neither monitor will go to sleep at the set time (15min). i've tried repairing permissions during a safe boot, re-installing the cintiq driver, unplugging and plugging in the cintiq and nothings seems to work.
i've run onyx and cleaned some caches but still it persists. any ideas out there?
thanks a million!
cheers,
sean

UPDATE:
seems the screen saver comes on at the appointed time. the screen goes to sleep at the appointed time, too...only to turn back on right after going black.

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Dual monitor freeze on sleep

Mac OS X 10.9.5. Current model iMac: 3.5GHh i7. 32GB main mem. NVDIA GeForce GTX 780M 4096MB.
Runs fine without a second monitor. Sleep, both manual and timeout, works fine. Press any key awakes.
Plug in a second monitor (2 month old 27" Thunderbolt display) all works fine until Sleep happens, both manual and timeout, and then system is hard frozen. No wakey. Press and hold on/off key for a long time. Wait. Press on/off key 3 times, reboots and all is as before.
Only solution: Never sleep. Turn off at night to save screen hours.

Hi! Did you ever find a solution? I just bought a 2013 iMac and have the same problem- except mine will allow a login after sleep after an initial freeze of 4-5 seconds. Dual monitors as well.

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doing a little search, it seems a few people are having this problem.
Apple, can you please fix this pronto!?

Meaning MacMall doesn't accept returns on Apple products. If it has a problem, like mine, you have to go to Apple to get it fixed. You can't send it back for a new one.
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Vnyga, thanks but that's not it. The geek squad said something about my monitor plug ins I told them my computer recognizes the dual setup but won't work independently. He said you can keep tweak it but he has 3 monitors an although they will learn his only remembers about 70% of the time. I'm going to try hooking it up toy TV as a monitor. I just want to use it for security cameras. I do have a DVR I could use but I normally just use that when I'm ghost hunting. I'm actually I union millwright and part time ghost hunter so I'm not to well versed in computers or the talkology but I'm learning. Anyway my laptop w win8 works just fine. But... I truly appreciate I taking the time to respond an at least offer a solution thanks so much an I apologize for running my mouth on an on. Take care V.

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Hi there,
I just bought a MacPro1,1 with 2xDual Xeon 2,66 GHz processors. It comes with the standard setup of HD, Memory and the Geforce 7300 GT graphic card. The Graphic card has two DVI-plugs (DVI-D & DVI-S). So far, so good.
But when I attach two monitors to the DVI-plugs the second monitor gets no signal. If I then attach the second one with a VGA cable and a DVI-to-VGA switch it works (but with a bad quality/resolution).
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I'm running 2 DVI monitors off a 7300 GT in a Mac Pro, so it does work in theory.
Some ideas:
Have you tried switching cables?
Have you tried one monitor at a time to each of the DVI ports?
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G4 MDD dual 867 won't sleep

Sometime after the last Tiger security update, my MDD stopped sleeping. It goes black, then restarts. It does this every year or so. None of the standard fixes work: PMU reset, Cmd-Opt-p-r, disconnect USB devices, eliminate startup items. In the past, the problem went away after a few weeks, but not so far. Any suggestions?

Mac OS X: Why your Mac might not sleep or stay in sleep mode
http://support.apple.com/kb/HT1776
Sleep issues or a kernel panic may occur if a storage device is mounted via a PCI card that doesn't support sleep
http://support.apple.com/kb/TA24639
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T520 with dual monitors won't save resolution settings

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At this point I think you should get Applejack...
http://www.versiontracker.com/dyn/moreinfo/macosx/19596
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applejack AUTO
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FW800 won't sleep -- shuts down instead...

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I have this;
If your Mac happily goes to sleep but won't wake up--Hold down the power switch to force-reboot your machine and get it running again.
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Restart your Mac and immediately hold down the Command-Option-O-F key combo until you see a somewhat intimidating command-line display that ends with the Open Fimware prompt. Type the following line:
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set-defaults
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reset-all
press return
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Chromium causing monitors not to sleep

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Hello,
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Hey Renecek,
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I'm trying to set up a dual monitor for my new iMac. I'm using a second display I used with my old G5. My iMac recognizes the second monitor but the monitor won't turn on. Power button doesn't do anything on the monitor itself.

I'm trying to set up a dual monitor for my new iMac. I'm using a second display I used with my old G5. My iMac recognizes the second monitor but the monitor won't turn on. Power button doesn't do anything on the monitor itself.

If it won't turn on then the monitor is dead (power supply?, video circuits?). Not worth repairing.
If you have a new iMac then it has thunderbolt. So exactly what is that monitor you are trying to connect? For TB you can connect a mini-displayport monitor. Probably (not 100% sure with TB) can use dvi or vga too if you have the appropriate adapter.

[SOLVED] Help with dual monitors (second monitor won't wake up)

Hi. I'm trying to set up dual monitors, but I can't seem to get it to work.
I've got an ASUS P8H67-M EVO motherboard, and I'm using the xf86-video-intel driver. I'm using one VGA and one HDMI.
xrandr gives this
xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 32767 x 32767
VGA1 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
1680x1050 60.0*+ 74.9
1600x1000 60.0
1280x1024 75.0 72.0 60.0
1440x900 75.0 59.9
1152x864 75.0
1024x768 75.1 70.1 60.0
800x600 72.2 75.0 60.3
640x480 72.8 75.0 66.7 60.0
720x400 70.1
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 531mm x 299mm
1920x1080 60.0*+ 50.0 60.0
1920x1080i 50.0 60.1
1680x1050 59.9
1600x900 60.0
1280x1024 75.0 60.0
1280x960 60.0
1152x864 75.0
1280x720 50.0 60.0
1152x720 60.0
1440x576i 50.1
1024x768 75.1 60.0
1440x480i 60.1
832x624 74.6
800x600 75.0 60.3
720x576 50.0
720x480 59.9
640x480 75.0 60.0 59.9
720x400 70.1
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
So it looks to me like both displays are being detected. The geometry looks such that one display is on top of the other, but I can change that using an xorg.conf.d config file (e.g. https://wiki.archlinux.org/index.php/Mu … xorg.conf). I also tried using arandr.
The real problem is that the display on HDMI3 just isn't "waking up". The power is on, but it just sits there in sleep mode.
Any help would be great. I might just be missing something simple. Thanks.
Edit: I just saw a short list of window managers near the bottom of the Arch Multihead page (https://wiki.archlinux.org/index.php/Mu … _xorg.conf). I don't see openbox on that list. Does that mean I'm SOL if I want to use openbox with multiple monitors? This page seems to imply that it should work fine with openbox http://magnatecha.com/dual-monitors-wit … nd-xrandr/.
Last edited by Pacopag (2013-08-19 18:58:36)

I use XFCE, and when I boot my computer I just run:
xrandr --output DVI-I-1 --auto --output DVI-I-2 --auto --left-of DVI-I-1
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Dual monitor sleep problem

I have dual monitors and with 10.5.1 my second monitor will not open after it has gone to sleep. I have to shut down and start over. A simple restart will not bring it back up. I have never had this problem before. Any help??

Welcome to the Apple Forums.
In System Preferences (found under the Apple Menu in the menu bar), look at the Display pane to see if both screens are recognized by the system. Click on the Detect Displays button. This will force the system to connect to the monitor and will show you if there is an OS problem, or perhaps a hardware problem.
I keep the "Show displays in the menu bar" checked so that I can access it through the Display image in the Menu Bar at the top of the screen.
My experience is that different monitors have different capabilities of connection to the computer- some have to be "detected" every time; some connect, but have to be changed from a mirror to a span or repositioned in the arrangement pane; some just "work right"
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Won't sleep with 2 monitors

Hi
My G4 GE will not sleep when I have dual monitors connected.
I have the stock AGP Rage Card with a Sony CRT.
And I have an additional PCI Rage card with an Apple Studio Display.
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Hi, IndiGo!.
1. What changes did you make to your Mac before this problem arose? If the problem arose after making a change, it's possible the change is the cause. Is the addition of a "second monitor" the latest change?
2. You wrote: "When the second monitor is connected, the mac will not go to sleep. (I click Sleep in the Apple menu - both monitors go out but the mac is still running)."This implies that whatever graphics card or monitor from the two pairs you specified that is "the second monitor" is not responding to Mac OS X power management commands. The Mac may then be in Doze, vs. Deep Sleep mode.
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Dr. Smoke
Author: Troubleshooting Mac® OS X

Monitor won't turn on after "sleep"

Hi,
I have an Apple Studio Display 17" hooked up to a New Mac Pro, running 10.4 Tiger. When the computer goes to sleep the monitor won't come back on when I wake it unless I shut the monitor off and turn it back on again. Why?
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What did ssh probing tell you.
Try using PC blindly. For example, leave music player on screen, wait for the fault to appear and than start it. If you hear the sound, then it is either:
Your closed-source driver mistake. Try changing it's version either side or replacing with open-source one. For radeon it is really better already.
Your monitor can't wake up from sleep. Nothing can help it, then. When rebooting PC, it gets a special signal, different from that on sleep.

Dual Monitors won't sleep

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