External monitor flashes on and off randomly after wake from sleep

I have a Mid-2009 13" MacBook Pro 2.26GHz hooked up to a Samsung SyncMaster 2033 External monitor via the MiniDisplayPort-DVI connector.
After waking from sleep, the external monitor will go blank for a fraction of a second at random intervals (display on the MBP remains normal). The flickering clusters are about minutes apart, while flickers within a cluster (usually 2-3 flickers per cluster) is of order seconds apart. "Detect displays" will not make this go away. The only way I can make it go back to normal is to unplug-and re-plug the MiniDisplayPort connector on the MBP.
Anyone else got a more elegant solution to this that does not involved wearing down the displayport?

I tried this. No change. However, I did start playing with the Display settings. Oddly enough, when I change the disfunctioning monitor to 720p it starts working again. Does this mean anything to anyone?

Similar Messages

BUG: Sandisk USB flash drive in "half-mounted" state after wake from sleep

My Sandisk Cruzer Crossfire 4GB Flash Drive is left in a half-mounted state after wake from sleep. The Finder believes the drive is still mounted, the icon is on the Desktop. However opening a file on the drive, or trying to eject the drive, results in a long beach ball, followed by a message that I removed the drive without Ejecting it first. The same drive continues to work fine on my Tiger machine, and on PCs.
Bug Report:
Setup:
Macbook 1st Gen (2.0 Ghz)
Mac OS X Leopard 10.5 Clean Install
Sandisk Cruzer Crossfire 4GB USB Flash Drive (in either port)
Repro:
Plug in the drive.
Close the MacBook to put it to sleep
Reopen the MacBook
Result:
The lights on the flash drive never light back up after wake from sleep. Navigating the drive, or trying to eject it results in a "you removed the device without ejecting it first" message.
Expected:
Drive should still be mounted and accessible after waking back up.

It may be a design flaw in the device. Mac OS X does a lot more power management than most other OSes, including tearing devices down to little or no power during sleep. It is possible that the device simply misbehaves due to corrupted memory state or reports a substantially different GUID or something similarly bizarre upon wake. (Okay, that last one wouldn't technically be a power management issue....)
If it doesn't have any problems except when sleeping the system, I would just make sure I unmounted it before putting the machine to sleep and wouldn't worry about it. Maybe check with Sandisk to see if they have a firmware updater for the device.

Left USB-Port dead after wake from sleep. Just restart helps.

I hoped Apples keyboard-Update today would solve my biggest hate-bug in this buggy POS called Leopard. It didn't.
As usual on my Leopard-Macbook Pro, no device will work on the left USB-Port after I waked the computer from sleep. Just a restart helps. I hoped this update to solve this, because it replaced among others "IOUSBFamily.kext".
Terminal gives a timeout error for the internal USB-Hub after wake from sleep. I assumed this should be related.
I'm really angry now.
When will Apple solve the most urgent problems in Leopard?
Was 10.5.1 just smoke and mirrors to make (fool people into...) people upgrade who intended to wait until the first maintenance-update?
Was Leopard Apples attempt to make Windows-Users more comfortable by putting in some heavy extra-bugs and blue screens?
FIX IT FINALLY! And f... don't wait for Macworld to release 10.5.2. It's desperately needed and the current state of Leopard will leave some people very sad at christmas after getting their first Mac. First impression counts and many more peoples first contact with the Mac will be at christmas...

Apple knows the problem and for some reason they are stumped on fixing it. this is so bad I can't believe it. On my macbook pro with Leopard installed, USB left port is dead after sleep. Only restarting can power it back up. I have to restart every day to use my external hard drive for time machine or when putting my flash drive in the port.
Come on already Apple. This is a SERIOUS, SERIOUS problem.
Fix it.

My Mac Pro loses network connection after wake from sleep since Yosemite upgrade.

Mac Pro loses network connection after wake from sleep since Yosemite upgrade. Any one have this issue as well. And is there a work around?

Wi-Fi?
Wi-FI connection drops
Wi-Fi Problems in OS X Yosemite
Wi-Fi Problems in OS X Yosemite (2)
Wireless Diagnostics
Also try turning off Bluetooth.
Troubleshooting Wi-Fi issues in OS X
Wireless Connection Problems - Fix
Wireless Connection Problems - Fix (2)
Wireless Connection Problems - Fix (3)
Wireless Connection Problems - Fix (4)

Second Display flashing on and off randomly

Since upgrading to Lion, my second display (ViewSonic VX2235wm) flashes on and off frequently. There doesn't seem to be any pattern to it. Has anyone else experienced this behavior? This problem is with a second display hooked to my 2.4 GHz Core 2 Duo iMac. It's driving me nuts!

I've since tried other resolutions and haven't found any others that are stable. I've used the monitor with another system and had no problems and the problem started immediately after the Lion install, so the issue is clearly Lion-related.
I haven't heard of many people having this issue, so I'm contemplating upgrading the monitor to get around it. (Longterm, the 1360x768 solution is unacceptable to me as it stretches the image.) I think it may be specific to a few makes/models of monitors and possibly even to a graphics chip/monitor combo. I think if it were more general, there would be more noise about it: a two monitor set-up isn't uncommon.

MONITOR FLASHES ON AND OFF

MONITOR FLASHES ON AND OFF

Hi,
If you have another working monitor, then you can connect to make sure if its a issue with the computer tower or the monitor. You can also follow below steps:-
1. Turn Off the system----> Disconnect all the cables except keyboard, mouse and monitor---->Then press & hold the Turn ON button for 10 seconds--->Reconnect power cable with mouse, keyboard & monitor---->Turn ON the system
2. Check the light status at the back of the computer tower where the power cable is connected, if its flashing or stable LED.
"I work for HP."
Please click the "White Kudos" star to say thanks for helping.
Please mark "Accept As Solution" if my help has solved your problem.

10.5.2 Update - Second monitor "blinks" after wake from sleep

Posting in the off chance that others have seen this behavior. This seems to be Leopard related, and did not start happening until after I installed the 10.5.2 update.
After waking from sleep my second monitor will blink on and off for anywhere from 2 seconds to about 30 seconds at which time it functions properly. It does not do this on initial startup OR when booting from my tiger volume (backed up with superDuper before a clean install of Leopard). Unplugging the display and plugging it back in also stops the "blinking"; turning the monitor off and then on has no effect.
My machine is a early (2007) model 2x2.66 dual-core with 3GB of (Apple) RAM and a GeForce 7300 GT. All firmware updates have been applied and software update reports no updates available.
The displays are both Sceptre X9G-NagaV 19" flat-panels connected via DVI, though I see the same behavior when using my 20" apple cinema display as second head. (I know these are cheap monitors. Please refrain from telling me that the displays are at fault - it 's not a problem with the display, as this doesn't happen under Tiger. The monitors have performed admirably for over two years)

Have you tried unplugging the second monitor, rebooting and letting it run without it for a little while, and then plugging it back in to see if it clears some persistent loading problem? My monitor has always gone out on me kinda randomly, but I think it's my GPU in my PMG5 that's losing power and resetting or something so it wouldnt be the same issue (I've gone through two so far with the same results).
Alternatively, try changing some of the display settings, such as resolution, color, and such to see if the change corrects how it's loading the display.

Finder stall after wake from sleep w/USB flash drive mounted

Has anyone else experienced this? iMac works flawlessly while USB flash drive is mounted UNTIL iMac sleeps. Then as soon as the iMac wakes from sleep the finder is non-responsive (perpetually spinning beach ball) and other apps slow to a crawl and become non-responsive as well if they need the finder (i.e. to save, etc.). This only happens when the USB flash drive is mounted.
Trying to force quit (relaunch) the Finder does not work, I always have to perform a hard restart.
I have an external FireWire hard drive that works beautifully and does not cause these same symptoms.
Any ideas?

umm.. don't let the computer go to sleep with your jump drive connected? The mac will usually take a few seconds to get his gear together after waking up from a sleep sounds like he is having to gather additional things since the jump drive is in there. I don't have a REAL solution except don't let Mr. Mac sleep with the jump inserted....

HP Envy 14 (2020NR) - randomly missed keystrokes after wake from sleep (on battery power only)

While running on battery power, sometimes when I wake from sleep, keystrokes will randomly be missed. It doesn't always happen, and I need to do more experimentation to figure out just how often it occurs. To fix it, I just reboot the computer (while still on battery power), and the problem seems to be gone. It can also be fixed by simply plugging in to A/C power. I am using Windows 7 Home Premium 64-bit.
I have seen similar threads where people say that repeated keystrokes are missed, or rapid keystrokes are missed -- but so far those threads have remained unanswered, and my problem seems a little different in that no one else has mentioned a correlation with running on battery power. The problem never occurs otherwise, for me.

If you are still under warranty you need to return the laptop for service. If not I am afraid it is a motherboard issue requiring replacement. You have done all the diagnostics a professional would do. The fact that the battery works in another computer tells us it is not the battery.

Sudden strange behavior---monitor rez & DSL modem after wake from sleep??

Awright. Been running 10.4.5 on DP G5 2.5 for about a month now. Nothing changed, or nothing installed in last couple weeks when last couple days--
-wake from sleep, one of my 2 monitors has changed resolutions by it self
-even more stange, my 2Wire DSL wireless, (I'm hardwired to it, wife's iBook
connects thru AirPort) shows 'no Local Network'.
When I restart, everything's back to normal and working. So...why would everything be fine for 3 weeks or so, and with no new installs, or changes to system, this stuff start happening?
Yes, repaird permissions, DiscWarrior, and booted in Safe boot mode, and re-installed combo updater 4.5 2 times, and repaired permissions.
Same thing.
Ideas?
Thanks,
p2
G5 DP 2.5 Mac OS X (10.4.5)

Very odd indeed. Open your Console (Macintosh HD > Applications > Utilities > Console) and hit "Clear" on console.log. Put the Mac to sleep and wake it, and paste what's there in a reply. Then reset your settings and do the same for system.log. This should give us an idea of what's happening.
Thanks,
--Ryan

Bluetooth Unresponsive After Wake from Sleep

I have an issue where when my macbook pro wakes from sleep, the bluetooth mouse will not connect, and BT becomes unresponsive. Sometimes I can turn bluetooth off then back on and be OK, BUT 95% of the time, I have to restart the computer to get bluetooth back.
After waking, the BT appears to be on, I get the popup on the screen which tells me "connection lost" with a picture of a mouse. I can open BT preferences and turn BT off, but nothing happens. I can even recheck "on" but it is completely unresponsive.
Things tried:
Allow BT to wake this computer is UNCHECKED
in activity monitor I have forced quit BLUED, but BT does not come back.
I have trashed the BT preference file Mac HD/library/preferences/com.apple.bluetooth.plist
I have reset SMC and PRAM
Tried a Logitech V470 and mighty mouse
Fresh install of 10.6.0, then upgraded to 10.6.1, then 10.6.2 (using combo)
Tried disabling steermouse, fresh batteries, holding my mouth right...
When the BT is not responding, the BT name either changes to 2.2.4f3 (which is the Apple BT software version), or it says "name not available".
Also in system profiler, when BT is not responding the BT "Hardware settings" section is missing. It starts with "services".
This is driving me crazy. Could this be hardware related? I feel it is more software, since on restart, the BT mice pair perfectly and work great. The never randomly disconnect.
This issue only happens when the computer resumes/wakes from sleep.
Everyone please provide feedback. I am the only one with this issue? I have scoured the net, and find very little regarding this exact issue. I am within my 90 days from buying, should I call Applecare or is it a waste of my time?
Thanks for your help,
Jeff
Spec's:
mid-2009 aluminum uni-body, Intel 2.66Ghz, 4GB Ram, 320GB HD
Snow Leopard 10.6.2 (Clean install to 10.6, then upgraded)
Login items: Steermouse, PleaseSleep, and Windows Live Sync
Also running at startup, but not in Login items: Paragon NTFS, Flip4Mac,
MacFuse, LogMeIn

I've got what sounds like the same problem with my new unibody MacBook Pro.
I've had the problem with both 10.6.1 and 10.6.2.
I also find that a reboot fixes things. In my case, I can sleep/wake multiple times with
no problem, but once the BT goes unresponsive upon wake, every subsequent sleep/wake
will suffer the problem until I next reboot.
I also discovered that in my case I can re-pair the non-responsive devices (two flavors
of Logitech mice and an Apple wireless keyboard) while in sick-BT mode and they will
work until I next sleep/wake, whereupon they will again fail to connect and my
choice is either to re-pair yet again, or reboot and have the problem go away, at least
for awhile.
I'm trying to correlate my activity with my BT going out to lunch, but have yet to narrow
it down definitively. I have one or two data points that make me suspect it goes south
after I use VMware Fusion (Version 2), but I cannot yet rule that one completely in or out.
/Kevin

USB mouse freezes after wake from sleep.

Since the 10.8.2 update my Logitech USB mouse freezes after waking up the computer from sleep or when it goes into energy save from non use. This also happens to my brand new MBPR. I tries repair permissions and reset the smc. Any suggestions?

I get a frozen mouse (Microsoft Intellimouse Optical) on my 2012 Mac Mini running Mavericks (it did it with Mountain Lion also) when waking from sleep about 75% of the time which works again if I unplug/replug it (light is on and mouse buttons work when it's frozen, but the pointer won't move). It does this whether I use a built-in USB3 port, a USB2 hub and now also with my new USB3 hub.
However, my 2008 Macbook Pro also has an Intellimouse connected to it when docked and it NEVER freezes when waking from sleep whether using the built-in USB2 port or a Gmyle USB3 card port. Either way, the mouse wakes fine and it's the SAME MODEL MOUSE and SAME OSX verison. I have no idea why the inconsistency. It ***** because "Wake on Network Activity" FINALLY works right here in Mavericks with XBMC on my Mac Mini so there's a perfect opportunity to save some electricity. I got excited when it woke up two times in a row with 10.9.1 and set up my sleep controls only to find it wouldn't go to sleep with the Energy Savings menu because I have an external USB3.0 3TB media drive connected (at all times). I finally found out (through more patient testing) that once the drive spun down (possibly on its own power saving timer as I'm not sure the "Shut down hard drives when possible" setting works in Mavericks; it was messed up in Mountain Lion in 10.8.4 and even though 10.8.5 fixed it, I'm not sure Mavericks is using the same code. It doesn't seem to shut down any faster with or without the setting on and shuts off several minutes after the computer attempts to go to sleep (on a 1 minute test setting; I think WD defaults to 10 minutes in firmware).
Anyway, once that was resolved and I saw it would go to sleep eventually once the drive spun down (it will sleep instantly if I select SLEEP from the Apple menu which I find odd if it's such a big deal that it's connected....), I thought OH BOY! I'm all set. Then I woke it from that sleep and found my mouse was frozen again..... :-( What a PITA to unplug/plug the mouse every time it wakes from sleep. It's not worth it. I'll just have to pay the extra few bucks in electricity each month I could have saved to avoid such a freaking nightmare hassle. Why on God's Green Earth, Apple CANNOT or WILL NOT fix their darn energy savings features is just beyond me. Instead of spending all their time making horrible horrible ugly icon/GUI updates to iOS and making it slower and slower and slower, why don't they actually fix some darn bugs in OSX for once in their lives.... I'm starting to think I should give Windows another chance I'm so annoyed right now. But then I think about having to run a malware program and have that program update and Windows software/security updates 3x a day and I think I can just deal with the Mini not sleeping.....
I'd like to know why Apple couldn't figure out those of us with multiple monitors would want a dock on BOTH monitors all the time either (first side-mount docks wouldn't migrate and now in 10.9.1, bottom-mounted docks won't migrate here either, leaving a dock on one monitor all the time and if that's the monitor that is showing full-screen video, you lost your dock completely while the video is playing. They finally figured out after a full decade that having a menu bar on both screens would be a good idea, but it just didn't occur to them that the same is true of the dock. How much are they paying these guys? Too much apparently (or is it too little to attract talented thinkers? Nah, it couldn't be since we give them feedback and they just ignore it).

I'm booting from a new LaCie Thunderbolt SSD and it won't wake from sleep.

As my boot drive I have a new 1TB LaCie Thunderbolt SSD Disk. It's connected to a 27" 2.7 GHz Intel i5 iMac (mid 2011). I'm running OS X 10.8.2. Nothing else is connected on Thunderbolt.
Everything runs fine and very fast, with the one exception of not waking from sleep.
When I try to wake it up, the screen illuminates and the desktop is not completely frozen: I can drag windows around, but I can't open applications or do anything with the Finder. I get a spinning beachball if I move the cursor over the menu bar at the top. The only option is to restart.
I've contacted LaCie and they say their devices are "storage devices" and not "system drives". Yet I've been running my system from a 1TB LaCie D2 for at least a couple of years. I pointed out to LaCie support that nowhere on the box does it say their devices are for storage only.
Any suggestions?

@Kappy - not the most useful of replies mate to be honest.After all, there is a strong possibility that this has everything to do with the way OS X and the thunderbolt interface handle wake from sleep states.
@kbrine:
I am having exactly the same problem but with slightly different hardware:
iMac 27 (mid-2011) with Mountain Lion 10.8.2
Booting from a Crucial M4 SSD in an OWC SATA enclosure connected to a Lacie eSata thunderbolt hub (which is connected to the iMac).
In normal use the drive is super fast and works really well.
But my problem is exactly as you describe, put the machine into sleep, and on wake everything appears to come back ok however you can't open apps from the dock and the spinning beachball appears. You can't do anything else and you have to reboot.
Now the interesting thing is that if I put the machine to sleep and then wake it up again within 1 minute everything works perfectly. After a longer period of time - and I'm presuming when the energy saving profile moves to a deeper sleep state (I don't know for sure so speculation from me here) - I get the problem we are having and I have to reboot.
Here's what I've tried so far:
Updated my SSD to the latest firmware.
No firmware updates available for the OWC enclosure nor the Lacie eSata hub (at least, not that I could find)
Turned off bluetooth (others on this forum had a problem with BT interfering with Thunderbolt displays coming back on after sleep)
Turned off 'Automatic Brightness Adjust' (again, based on Thunderbolt Display problems that others have reported)
I've tried out AutoEJECT and Jettison apps that unmount all external drives and re-mount them when waking from sleep. They've made absolutely no difference. Save yourself a few $$ and don't bother buying them from the App Store.
I've tried unplugging and re-inserting the Thunderbolt cable connecting my eSata hub to the iMac. No effect.
And that's as far as I've got. There are only two things left for me to try:: disable 'Power Nap' which - apparently - can also cause problems with Thunderbolt devices during sleep. But I'm not confident with that being the solution. Turn the power off to the Crucial M4 when the problem occurs and then re-power it in the hope that it causes some sort of refresh of the connection to happen. Again, not sure that's a good solution either as I don't want to be powering down my SSD every time I bring the iMac out of sleep!!!
So I too am open to ideas and opinions on what might be causing these wake-from-sleep problems arising when Mac OS is booted from an external thunderbolt drive.

Crashes after wake from Sleep after 10.8.1 update

2.5 Ghz Mac Mini (mid 2011), 8 Gigs of RAM
Since the day I upgraded to 10.8.1 I have had persistent crashes, 1 every 24 hours or so. It's always shortly after a wake from sleep. In all cases, it is impossible to switch to a random open application. But once I hit that application, no other application will respond to anything, including a Force Quit, or if it will force quit, it won't relaunch. A shut down will hang because an app refuses to quit. I can quit the Finder, but it won't relaunch. Have reinstalled Mountain Lion twice, zapped the PRAM, reset the SMC, checked and extensively tested the HD and RAM. Replaced RAM with original Apple RAM. Didn't help, so I swapped back to the RAM from Crucial. I can't think of anything else to try. Machine does not crash unless it has been asleep. Runs flawlessly when sleep is disabled. After a reboot (usually via a shut down via the power switch, start from scratch, check of the HD integrity, and then a clean restart) the machine will run fine, sleep and wake normally for about 24 hours. As near as I can tell from the logs, the hangs usually begin right after the Time Machine Backup after a wake from sleep finishes. If I don't allow the machine to sleep, there are no problems of any kind. Making me crazy. Did not occur under Lion or the .0 version of Mountain Lion. Is making me crazier than I normally am which is sorta serious.

Any solutions to this problem? I too have this kernel panic, however it only happens about once a week. Always upon wake from sleep as you've indicated.
FYI I don't have intego software, or an APC installed. Nor am I using filevault.
This is on an up to date, MacBook Pro Retina.
Robert

Why am i getting mouse lag after wake from sleep?

both cordless mmouse and corded wacom tablet are displaying lag after waking from sleep. restart usually, but not always, helps. usb devices are on a powered external hub. noticing this after upgrading from nvidia geforce 8800 to ati 5770. compatibility issue?
specs are:
Hardware Overview:
Model Name:          Mac Pro
Model Identifier:          MacPro3,1
Processor Name:          Quad-Core Intel Xeon
Processor Speed:          2.8 GHz
Number Of Processors:          2
Total Number Of Cores:          8
L2 Cache (per processor):          12 MB
Memory:          8 GB
Bus Speed:          1.6 GHz
Boot ROM Version:          MP31.006C.B05
SMC Version (system):          1.25f4
ATI Radeon HD 5770:
Name:          ATY,Hoolock
Type:          Display Controller
Driver Installed:          Yes
MSI:          Yes
Bus:          PCI
Slot:          Slot-1
Vendor ID:          0x1002
Device ID:          0x68b8
Subsystem Vendor ID:          0x106b
Subsystem ID:          0x00cf
Revision ID:          0x0000
Link Width:          x16
Link Speed:          5.0 GT/s
NVIDIA GeForce GT 120:
Name:          NVDA,Display-B
Type:          Display Controller
Driver Installed:          Yes
MSI:          Yes
Bus:          PCI
Slot:          Slot-2
Vendor ID:          0x10de
Device ID:          0x0640
Subsystem Vendor ID:          0x106b
Subsystem ID:          0x0010
ROM Revision:          3386
Revision ID:          0x00a1
Link Width:          x16
Link Speed:          5.0 GT/s

That's normal. It just lets you know the call has ended.

External monitor flashes on and off randomly after wake from sleep

Similar Messages

Maybe you are looking for