Computer wakes from sleep for no obvious reason

The console tells me this:
11/09/2010 21:36:54 kernel Wake reason = UHC4
11/09/2010 21:36:54 kernel System Wake
11/09/2010 21:36:54 kernel Previous Sleep Cause: 0
11/09/2010 21:36:54 kernel The USB device IOUSBWirelessControllerDevice (Port 1 of Hub at 0x1a000000) may have caused a wake by issuing a remote wakeup.
There are no USB peripherals plugged in. What's going on?

Got the culprit!
After a couple of nights where I switched off the mouse on the one hand and the keyboard on the other, I found the guilty party who keeps waking my iMac up: the keyboard. My computer slept all night, peacefully until I manually woke it up this morning.
The night before with the mouse turned off, the same issue kept happening as previously described.
So here is the cure for anyone suffering the syndrome:
Turn off your wireless keyboard (by pressing and holding the power button on the side until the green LED has gone off), then use your mouse to put your computer to sleep, it will sleep undisturbed until you wake it up again yourself.

Similar Messages

Display Changes Resolution When Computer Wakes From Sleep

I have a MacBook Pro bought in May of 2006. In the last year, this problem has been getting progressively more annoying to me. When the computer wakes from sleep (not every time, but most of the time) the screen will flash blue, then reset the resolution to 640 x 480, I think. To fix it, all I have to do is go to System Preferences and change the resolution, but when I do that, it pops up two windows, like it thinks I have a dual display set up. To fix this, I always click 'detect displays,' and it fixes it, but the next time I wake the computer from sleep, it does it again. This isn't really an urgent problem, but I would expect my computer to behave a bit better for me.
Thank you in advance for any aid you might give me.
Lisel

Hi Lisel. I have a similar age MacBookPro that does the same thing. I don't really know how to fix it I'm sorry, I wish I did cause it's annoying. I just thought I'd let you know you're not the only one with this issue.
Basically, for some reason it thinks it has two displays connected, even when there isn't. To stop it being a total pain, make sure when it does come up with the two Display Pref windows to set them both to 1440x900, at least then when it does go dual display it won't be 640x480 and you can still read stuff.
I've also left the Display Pref icon on the top tool bar (next to the AirPort and Bluetooth and stuff), so I can just click that and Detect Displays. When it does that it figures out for itself it doesn't actually have two displays connected and so goes back to normal.
I know that's a workaround and not a fix, sorry. I'd be keen to know if anyone else has any better solutions:)
Thanks,
Mark.

Computer Wakes From Sleep

My computer wakes from sleep (MBP 10.6.4). At the time my computer wakes (not exactly sure of this), a message in the Console reads "Focus[143] Screen parameters schanged". When I open the lid, the keyboard is lit-up, the screen is blank and the is no prompt for logging in. I have to hit escape, close the lid, wait until I see the computer sleeping, open the lid, then I can log in. I have a program on my Mac called Focus, could this be the culprit or is it something in the OS itself? Many times when this has happened, my computer fans are screaming and the computer is very hot. I have been eliminating many bugs from my system but this is one I need some help with. Thanks.

Focus certainly sounds like it could be the culprit. I would remove it from your account login items an test to see. You do this in System Preferences>accounts>login items tab. You'll have to unlock the preferences and enter your admin password and then select Focus in the list and hit the "-" button below the list.
The only other things I can think of are a bluetooth device waking your system or "wake on network access".

Screen flickers when computer wakes from sleep

O.k., so I also had this problem when I updated to 10.6.8, but it's still here in Lion.........
When the computer wakes from sleep, I get a single flicker along the bottom 1/3rd of the screen, then everything's o.k.
It's just annoying, that's all. I've backed out to 10.6.7 on 3 occasions, and the flicker disappears.
Anyone else having this issue?
I'm running a 2010 Quad-core Mac Pro with SSD and 27" Display.
Bob.

Update:
I've now been to the local Apple store, and tried their display Mac Pro/27" Cinema Display combo, and guess what.......the screen flickers on wake-up.
I asked the guy in the store about it, and he says "oh yes, I see that. No-one has noticed that before, I wonder if mine does it at home".
I tried the Mac Mini with 27" Cinema display, and the 27" iMacs, and they were o.k. (no flicker).
So, this only affects Mac Pro's running 2560 x 1440 resolution.
I've booked another call with Apple Support. No doubt they'll still tell me to take my computer in for testing, even though I've shown they all do it (the guy in the Apple shop suggested that, even though I demonstrated the flicker to him on the one in the shop).
I wonder how long this will take to get a software fix? Problem is, the Pro is not mass-market (like Macbooks and iMacs), so it may take an awful long time.
In the meantime, I'm sticking with 10.6.7.
Bob.

10.4.7 kernel_task eats 70% of CPU only when computer wakes from sleep.

On my machine (FW 800), 10.4.7 caused: machine to slow perceptably after wake from sleep. Activity Monitor tells me kernel_task is consuming hundreds of times it's normal CPU cycles.
I installed a FRESH 10.4. Imported my files and folders. Upgraded all the Apple software EXCEPT 10.4.7 combo updater. The partition worked fine, before and after sleep. Upgraded using the 10.4.7 combo updates.
Again, kernel_task consumes 60-70% of CPU cycles after my Mac wakes from sleep. Note that it works fine when first rebooted.
As slow as it was, it was unusable. I reverted to 10.4.6 to get work done.

I have the very same problem on the same platform, except that I have 2 int. bootable disk drives. One boots 10.4.6 and has no problems at all. The other Boots 10.4.7 and operates perfectly, as far as I can tell from a few hours of use. It will continue to work just fine until I put it to sleep. On awakening, the Kernal Tasks CPU Usage jumps to 55% - 75% and does not decrease any further (ever). Restart or Shutdown restores perfect operation after reboot (but don't let him fall asleep).
I have repeated this dozens of times, with identical results.
The update was performed by the book. External devices disconnected, permissions repaired, disk verified by Disk Util. and DiskWarrior and the 10.4.7 combined update was used. Permissions and Drive Verif. was repeated after sucessful install. In my case, no other apps were effected. No Sys Errors were logged, No crash events, no Kernel Panics.
There are thousands of Sys Config combinations involving both hardware and sotware. This looks like a flawed release on this hardware. "Updater Beware", especially the first month after a major release like this. Look for a fix very soon.
Even so, the people at Apple have done extremely well over the last few years.
I know, because I work with a dozen or more Generic PCs and there has never been a trouble free update from the other side.
Having a second internal hard disk with identical OS and applications is like having a second computer in the same case. It is also a good idea to use backup software to auto-sync your user files in realtime. You can boot from one while repairing the other etc.

Audio volume low when computer wakes from sleep - os x yosemite

I've been having an issue ever since I upgraded to OS X Yosemite, where the audio volume coming out of my external speakers is extremely low after I wake my computer up from sleep. The only resolution I have found is restarting the computer. Once I do that, the audio volume is great. If I were to boot up my computer after it has been completely shut down, the audio volume is also great. The issue only occurs after sleep. Anyone else having a similar issue? Is there another fix besides restarting the computer?
Speakers: Bose Companion 2 Series II (these are wired, not bluetooth)
Computer: Mac Pro - late 2013 - running Yosemite

This is a BUG. It has been submitted to engineering many times - unfortunately Apple has not done anything about it.   We have 5 Mac Pros, all 5 do the same thing after updating to Yosemite.   The PRAM / SMC reset is useless - we even installed a fresh OS on one of the machines (a suggestion of the level 2 Apple tech) same problem.   Clearly this is a system level bug.   Only way to get it resolved is to keep pounding the bug report site with requests.     The squeaky wheel gets the oil.   The problem is 100% repeatable on the machines that exhibit the bug.
In the mean time set up an applescript with this command and it will reset the sound - do not include the brackets :
<do shell script "sudo killall coreaudiod" with administrator privileges>
Run it every time you wake from sleep and you won't have to deal with the problem ever again.
Pretty lame that Apple has not fixed it even though the problem appears to be pretty widespread.

Display wakes after sleep for no apparent reason

Had the imac for 6 months first time I have had this issue.
I put the imac to sleep and within 30 secs it wakes with my password login dialogue box (the dialogue box is normal, I have the display password protected), it then goes blank as if going back to sleep, then does the same thing again repeatedly. If I don't login then eventually the screen goes blank, the sleep light goes off all together, then the machine will not wake and I have to switch it off and back on again to get it working.
I have a bluetooth mouse and keyboard, sometimes if these are knocked then the machine will wake from sleep, however, I have made sure this is not happening and so this does not explain the problem.
Any help gratefully received, I am baffled!!

Go to System Preferences and select Energy Saver. Uncheck "Wake for network access" option. See if that if that solves your issue.

HT1338 why do i lose wi-fi internet connection on iMac when computer wakes from sleep

Everytime my imac wakes from sleep I lose internet connection and have to go into network and reconnect. I am using OS X Mountain Lion software. Please help!

You might try looking at these Apple support articles:
http://support.apple.com/kb/PH11099
http://support.apple.com/kb/PH10662 - very simple suggestions only
Here is another thread with a suggestion:
https://discussions.apple.com/message/18848093#18848093
You also might want to consider filing a feedback report. A lot of people are having similiar problems:
http://www.apple.com/feedback/
If you monitor the "More Like This" box (top right), other threads appear. Opening them usually displays other threads.

Firewire dismounts when computer wakes from sleep

I have a G-Drive mini hooked up via the firewire 800 port on my MacBook Pro (early 2011 - 13 inch). The drive is directly connected to the laptop but serves also as a pass through for two other firewire drives (non G-Tech). I usually only have the one G-Drive turned and turn on the other drives only when I need them.
The issue seems to be that when I wake my computer from sleep the drive will disconnect itself. I get the dialogue warning of ejecting a drive improperly and then have to shut off the drive and turn it back on for it to mount again. When I shut off the drive in this conidtion I get the standard spinning drive beep sound that tells me it was not meant to be turned off that way... So I assume that the computer or the drive are not communicating properly when the drive is connected and the computer goes to sleep.
Answers to inevitalbe questions: The drive is not hooked up to an external power source -- I have not tested the issue with a different or powered firewire drive -- I have not noticed the issue when all drives are connected via daisy chain -- None of my USB ports seem to be effected (knock on digital wood) -- The only application that is ever left open that may need to access the drive when I leave my computer and it goes to sleep is iTunes
Issues within issues: This does not always happen, but it seems to have been happening a lot more often.
Running Mac OSX 10.6.8
Currently using iTunes version 10.5 (although I highly doubt this has anything to do with the issue at hand)
If anyone has any insight on the problem, a fix or even if the issue is known or being ignored I would greatly appreciate the knowledge.

UPDATE:
I have started to turn off Bluetooth at night before I put my computer to sleep. I HAVE NOT HAD THE FIREWIRE RANDOM DISMOUNT PROBLEM SINCE. I do not know if this is a freak coincidence -- but so far, so much the better for my firewire drive.
Hope this helps someone else down the line... eh hem...

Qosmio G20 wakes from hibernation for no apparent reason

Greetings All,
For a while now I have noticed that my Qosmio G20 tends to wake from hibernation at random times for no apparent reason. When I place it into hibernation overnight it successfully transitions into a hibernation state but (usually) after a few hours suddenly wakes from said state for no reason.
Obviously this isn't a critical issue but I do prefer to hibernate whenever practicable (as opposed to standby) and it is rather annoying to awoken at 4:00am by the Qosmio's triumphant burst of music (still it's better than windows 'ta da!' :P)
Any ideas?
Kindest,
Lee.

There is indeed such an option available on screen 1 of the BIOS setup, unfortunately it is presently set as disabled so I guess that isn't the cause of my woes. :(
Thanks for replying though, always nice to learn a new thing. ;)
Lee.

Javascript (in Firefox 3) takes several minutes to start working when computer wakes from sleep, Mac OSX 10.5.8

Whenever I wake my Mac from sleep, with Firefox having been left running, some parts of Firefox take several minutes to start working again. These include switching between open tabs and any website functionality that uses javascript, eg gmail. This has gone on through many updates of Firefox. If I quit Firefox immediately on waking the Mac and restart it, everything is OK.

The following worked for me:
http://support.mozilla.com/en-US/questions/684867
"Problem: I had the same problem but with mac osx 10.5.8, Firefox 3.6.6 sometimes prints and sometimes does not, but the preview was always blank and I could not save to pdf file.
Solution: I downloaded Firefox 3.5.10, installed it on my desktop and opened it, tried print preview and it worked, quit Firefox 3.5.10 and ran 3.6.6 and voila! print preview is working fine and I can save to pdf fine.
I guess running 3.5.10 fixes the profile in a certain way. I have no idea how that happened but it worked."

Program starts when computer wakes from sleep

I have recently found that when I wake my machine from sleep, my scanner program starts up (HP Scan Pro). I can't figure out why or when this started to happen. I have looked in the application preferences to see if some setting could be affecting this. But alas, I don't see anything.
Any thoughts?

What program launches?
There are many locations for startup items, kernel extensions etc.
/System/Library/StartupItems
/Library/StartupItems/
/Library/LaunchAgents
/Library/LaunchDaemons
~/Library/LaunchAgents
.. or System Preferences -> Accounts -> Login Items
Some printers may act like cameras and launch the default program in Image Capture. To check for this:
Go to Image Capture, select your device on the left and there will be a default program option (don't remember exactly what it is labelled as).

How do I change the password requirement when my computer wakes from sleep?

I followed the procedures as posted to change the password setting. This is a personal laptop. User setting indicate password is not required when waken from sleeping However, 8.1 continues to ask for a password. Need help!

Tried this. Settings indicate no password required for booting and no password required for waking from sleep. Password is not required when rebooting; however, continues to require password when waking from sleep. Any advise?
This was design by default, you still need password when system locked.
Roger Lu
TechNet Community Support

Computer wakes from sleep but screen remains black even after restart

So, I installed SL yesterday and everything seemed fine. Last night, I closed my computer's monitor (putting it to sleep) for the night. This morning, when I opened it, the screen was black. I could not see anything, so I just restarted the computer.
On restart, the screen remained black.
After some experimentation, I realized that the computer was actually running, but I just couldn't see anything. So, I typed my password - screen was still black.
I then pressed the power button and enter - shutting down the computer properly.
After it shut down, I turned it on and the screen came on as normal...
What's going on here?
I checked some other threads and there was some potential issue with the iphoto screensaver, but I am not sure if that is the case here or not.
Any thoughts on how to fix this or prevent it form happening in the future?

I just had a similar thing occur. After resetting the pram the screen came back on.
I had noticed some problems with the hot corners for sleep mode earlier so I have deactivated them now to see if this was the problem. The only other thing I can think of is the recent Java update. I installed it right before the problem occurred.
Kurt

Intel Mac Mini wakes from sleep (for no reason) after installing leopard

My mac mini keeps waking after its been put to sleep (both by selecting sleep by hitting the power button or using the apple menu item.
This only happens now I've upgraded to leopard; with tiger, all was fine.
Any ideas what's going on? The iChat logging in noise blasting through my speakers at 1am last night gave me a bit of a fright!

This may be something like a driver, application or external device which is not fully Leopard compatible, or even a component of MacOS if you upgraded to Leopard rather than did a clean install. To start the process of troubleshooting, first download and install the full 10.5.1 update from http://www.apple.com/downloads/macosx/apple/macosx_updates/macosx1051update.html , even if you have already updated to 10.5.1 using software update. The full updater has been reported to resolve a number of minor issues.
Next, assuming that doesn't resolve it, start up your mini, put it to sleep and then disconnect everything. If it continues to wake unpredictably, the issue is with the mini itself, and you may be best to backup all your data and do an erase and install to resolve any residual issues caused in the upgrade. If, on the other hand, the system remains sleeping, it points to an external device being the culprit, in which case plug each one in, one at a time until you can create the unpredictable waking again. Whichever component was last plugged in, is the primary suspect!

Computer wakes from sleep for no obvious reason

Similar Messages

Maybe you are looking for