Automatic sleep won't work

Any idea as to why my imac (early 2009) won't go to sleep? I cleared user login items, applications running, bluetooth, and sharing preferences. It still won't go to sleep automatically. I have Snow Leopard 10.6.8.
I'm thinking maybe having a second display might keep it from going to sleep automatically. Anyone out there with the same symptoms?
Thanks!

It most likely is a software issue ...to confirm this try booting into 'Safe Mode' and seeing if things resolve themselves. If they do, then it may be certain 3rd party software that is preventing sleep.
If not, then it may be a hardware issue - in which case you'll have to bring your book in to an Apple Tech.
http://docs.info.apple.com/article.html?artnum=107392

Similar Messages

After ram upgrade automatic sleep is not working anymore

Some days ago I installed a second 1GB ram module in my 20" Intel iMac. After this I noticed that the automatic sleep do not work anymore. The display turns off but the iMac not. The iMac makes sounds like he wants to do to sleep but could not.
I tried everything I could find... delete OS X powermanagement prefs, run Onyx, reset the SMC.
Do anyone have an solution for this?
Thanks

Does your iMac recognize the new memory module?
Yes.
You might try reseating the module in its slot, and it
would not be a bad idea to run Hardware Test from
your install/restore DVD, just to be sure there is
not an underlying hardware problem.
Already done - no problems reported
Is your new memory module of the same specifications as the
stock module?
Yes it is the same, I had a look on this before I bought it because I wanted to use the dual-channel mode.
Also, what are your settings for sleeping your iMac?
5 min to sleep display, 10 min to sleep the mac
One other thing you may wish to
try is updating your system of OS X 10.4.6 (your
profile indicates that your a running 10.4.5).
Was updated to 10.4.6. I just forget to change the forums pref
I more thing to mention when I start the sleep mode manually everything is fine. I also tried to disconnect all external USB/Firewire hardware and tried it with a fresh mac os install on my USB HDD.
Nothing helped.
Thanks

Computer sleep won't work on my iMac

Since installing 10.7.4, display sleep function works but computer sleep doesn't I've tried several combintions in Energy Saver) System Preferences) but I stillcan't get the computer to go to sleep at the selected time.
Any fixes?

Test after each of the following steps that you haven’t already tried:
Step 1
 ▹ System Preferences ▹ Energy Saver ▹ Power Adapter ▹ Wake for network access: uncheck. You may need to unlock the preference pane by clicking the lock icon in the lower left corner and entering your administrator password.
Step 2
 ▹ System Preferences ▹ Energy Saver ▹ Schedule… ▹ Start up or wake: uncheck
Step 3
 ▹ System Preferences ▹ Print & Scan ▹ Open Print Queue...
Check all printers for unfinished jobs. Deal with any you find.
Step 4
Disconnect all wired peripherals except keyboard, mouse or trackball, and monitor, if applicable.
Step 5
Launch the Activity Monitor application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ If you’re running Mac OS X 10.7 or later, open LaunchPad. Click Utilities, then Activity Monitor in the page that opens.
Select All Processes from the menu in the toolbar, if not already selected. Enter “powerd” (without the quotes) in the "Filter" text field. Select the powerd process and click the Quit Process button in the toobar (stop-sign icon.) In the sheet that opens, click Force Quit. You’ll be prompted for your administrator password. The process will be relaunched immediately.
Step 6
Boot in safe mode and log in. The instructions provided by Apple are as follows:
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Note: If FileVault is enabled under Mac OS X 10.7 or later, you can’t boot in safe mode.
Safe mode is much slower to boot and run than normal. Don’t launch any applications at first. If sleep still doesn’t work properly, back up all data and reinstall the Mac OS. After that, if you still have the issue, make a “Genius” appointment at an Apple Store to have the machine tested.
If sleep now works as expected, go on to the next step.
Step 7
Still in safe mode, launch the usual set of applications that are running when you have the problem, including your login items, one at a time, testing after each one. Some applications may not work; skip them. You might be able to identify the cause of the problem this way.
Step 8
If sleep is still working after you’ve launched all the usual applications, reboot as usual (not in safe mode) and test again. If sleep still works, you’re done, at least for the moment.
If you still have the sleep issue after booting out of safe mode, post again.

Energy saver keeps coming unlocked... sleep won't work

I've noticed when I arrive in the morning that my Mac Pro is awake. But the Time Machine log shows it had been an entire hour since TM was active.
I researched various places (including here) and deleted the preference for com.apple.PowerManagement.plist.
But the problem persists. What's more mysterious is that even though I lock the energy saver padlock, when I go back the next morning it is unlocked.
Any idea what's going on here?

Test after each of the following steps that you haven’t already tried:
Step 1
 ▹ System Preferences ▹ Energy Saver ▹ Power Adapter ▹ Wake for network access: uncheck. You may need to unlock the preference pane by clicking the lock icon in the lower left corner and entering your administrator password.
Step 2
 ▹ System Preferences ▹ Energy Saver ▹ Schedule… ▹ Start up or wake: uncheck
Step 3
 ▹ System Preferences ▹ Print & Scan ▹ Open Print Queue...
Check all printers for unfinished jobs. Deal with any you find.
Step 4
Disconnect all wired peripherals except keyboard, mouse or trackball, and monitor, if applicable.
Step 5
Launch the Activity Monitor application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ If you’re running Mac OS X 10.7 or later, open LaunchPad. Click Utilities, then Activity Monitor in the page that opens.
Select All Processes from the menu in the toolbar, if not already selected. Enter “powerd” (without the quotes) in the "Filter" text field. Select the powerd process and click the Quit Process button in the toobar (stop-sign icon.) In the sheet that opens, click Force Quit. You’ll be prompted for your administrator password. The process will be relaunched immediately.
Step 6
Boot in safe mode and log in. The instructions provided by Apple are as follows:
Be sure your Mac is shut down.
Press the power button.
Immediately after you hear the startup tone, hold the Shift key. The Shift key should be held as soon as possible after the startup tone, but not before the tone.
Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.
Note: If FileVault is enabled under Mac OS X 10.7 or later, or if a firmware password is set, you can’t boot in safe mode.
Safe mode is much slower to boot and run than normal. Don’t launch any applications at first. If sleep still doesn’t work properly, back up all data and reinstall the Mac OS. After that, if you still have the issue, make a “Genius” appointment at an Apple Store to have the machine tested.
If sleep now works as expected, go on to the next step.
Step 7
Still in safe mode, launch the usual set of applications that are running when you have the problem, including your login items, one at a time, testing after each one. Some applications may not work; skip them. You might be able to identify the cause of the problem this way.
Step 8
If sleep is still working after you’ve launched all the usual applications, reboot as usual (not in safe mode) and test again. If sleep still works, you’re done, at least for the moment.
If you still have the sleep issue after booting out of safe mode, post again.

Automatic Update Won't Work, Please Help!

Please help. I have the new 5G iPod and it has kinda been working fine for me. Everytime I go to plug it into my computer, the automatic udate won't start. The little iPod icon in the corner won't show up and when I go to pref. and click on iPod it says there is no iPod connected. I tried to restart the computer and iPod and plug it into a different USB port but still nothing works. I know I have new songs on there that I want to update on but the "Do not disconect" screen won't even come up. Any help would be great, thanks! =)

Try this:
Create a new user and make sure it is an Administrator account. Download and install iTunes.
If it installs properly, log out and then back in as you.
Uninstall iTunes using the method in this article:
http://support.apple.com/kb/HT1925
Then install from the link in my previous post:
http://support.apple.com/kb/DL1615
Have you been having problems with your laptop before this?
You can always try a system restore too if the above steps don't work.
Start > All Programs > Accessories > System Tools > System Restore > Next > pick a restore point (you will get later dates if you check the "Show more restore points" box) I would go back at least a couple days > Next > Finish. It may take a while then it will reboot. On reboot it will finish the restore so it may take longer than normal to boot. This will not change any of personal files, only system and program files.

Automatic Sleep no longer working on my Mac Mini :(

I just noticed my Mac Mini is no more going to auto-sleep as it should.
What can I try?
Resetting both SMC and P/VRAM did not solve the issue. I've also cleaned all system and program caches, plus repaired permissions.
I've searched the forums, and found quite a lot of topics about similar issues. Most were actually about notebooks. A lot of 'go there and delete this' solutions popped out, but I feel insecure to trash entire system folders.
Anyone can provide me with a safe & complete list of what I have to delete please?

really? sorry about that.
I guess that forum is restricted for people with at least two stars.
Here is a repost of that link.
My Mac pro doesn't auto-sleep. I've done an extensive search for possible solutions on apple support and elsewhere but nothing seems to cure it.
I made a little sleep program of my own which I'd like to recommend to anyone with the same problem. It's a very simple shell script that checks system idle time and if it's bigger than the sleep timer you set in system preferences it puts your computer to sleep. It will work so long as you can manually put your computer to sleep from the apple menu.
You'll also need to create a launch daemon to periodically run the script.
here are the steps to do it.
1. copy and paste the following into TextEdit.
<pre style="
font-family: Monaco, 'Courier New', Courier, monospace;
font-size: 10px;
margin: 0px;
padding: 5px;
border: 1px solid #000000;
width: 720px;
color: #000000;
background-color: #ADD8E6;
overflow: auto;"
title="this text can be pasted into the Script Editor">
#!/bin/bash
idl=$"`ioreg -c IOHIDSystem | awk '/HIDIdleTime/ {print int($NF/1000000000); exit}'`"
sleeptimer=$"`defaults read /Library/Preferences/SystemConfiguration/com.apple.PowerManagement "Custom Profile" | grep "System Sleep Timer" | awk '{print $5}' | sed -e 's/;//g'`"
st=`expr $sleeptimer \* 60`
if [ $idl -gt $st ]; then
shutdown -s now
fi
</pre>
2. Format it as *plain text* (shiftcommandT in TextEdit) and save it as sleep.sh (don't use the .txt extension) at the top level of your hard drive. (You can save it elsewhere of course but make sure it's accessible to every user and change the path to the script in the commands below).
3. make it unix executable by entering the following command in terminal.
*chmod 755 /sleep.sh*
4. Download and install Lingon .
5. Open Lingon and create a new Users Daemon
Call it,say, com.sleep.launchd (the name is not important)
On line 2. enter /sleep.sh
and in section 3 set it to run every 30 seconds (that can be varied).
Click save (you'll have to enter your admin password).
6. Restart.
That's it. Once this is done you can forget about it. The sleep settings are still controlled from system preferences. The sleep agent will work with every user and even over the login window.
To uninstall it, open Lingon , select the launch daemon you made and uncheck the box "Enabled" in the upper right corner. save and restart.

Auto-sleep won't work when web pages auto-refresh

Dear Apple,
Around 4 years ago, I noticed that my computer stopped going to sleep. I first noticed it shortly after adopting Gmail for my email platform and was subsequently able to isolate the issue down to Gmail and other websites, such as Huffington Post, which auto-refresh. Apparently, any website that auto-refreshes at shorter intervals than the auto-sleep is set to kick in, prevent the computer's auto-sleep function from activating.
I have spoken at length with AppleCare about this issue and understand that this is "by design." For instance, we wouldn't want the computer to constantly go to sleep while watching a movie or downloading and conversely, if we are actively working at our computers it's nice that Gmail auto-refreshes and keeps us appraised of incoming mail. However, since the vast majority of users now leave their browsers with multiple tabs open and due to the fact that more and more websites now auto-refresh, the auto-sleep function has become outdated and non-functional. While users can always manually put their computers to sleep, everyone at some time or another forgets to do so. This is exactly why computers are supposed to auto-sleep in the first place. Aggregated across millions of users, this results in a huge waste of electricity.
I've been writing/calling Apple (through AppleCare and the online feedback form) about this issue for 4 years now. I keep hoping that with each operating system release, some sort of "smart auto-sleep" function will be incorporated that will recognize when websites auto-refresh and still allow auto-sleep to kick in. Unfortunately, this does not appear to be the case in Lion.
I work in the energy efficiency field, specifically in lighting, and care deeply about this issue. I consider Apple to be an industry leader on this issue as well. I'm not familiar with the technical side of this issue, but I assume that with the right type of programming, the operating system could override a webpage's auto-update feature and activate auto-sleep, while not interfering with functions where a user would not want the computer to go to sleep, such as watching a movie. With Lion, Apple has focused its energy on making the computer adjust to the user,rather than the user adjusting to the computer. Yet, in this case, it appears to be the other way around.
It is time for Apple to update the auto-sleep function so that it takes into account websites that auto-refresh. When I set my computer to auto-sleep after so many minutes, I want it to do so, regardless of whether I have a browser with auto-updating websites open. Apple must take this issue seriously, as the wasted electricity is too important to ignore any longer.
Sincerely,
An Energy-Conscious User

I am obviously talking to Apple AND I posted this letter here, because a lot users seem confused about why their computers won't sleep. Even most AppleCare reps are confused. In the past, I couldn't find much in the way of explanations pointing to this issue, so I thought I post it here in case other people are looking for an explanation.
The auto-sleep function was built before websites auto-updated and needs to be updated to accomodate them. For the average user, it doesn't make sense for the computer not to sleep just because Gmail is open. Just because some website auto-refreshes in my browser, doesn't mean I never want my computer to sleep. By the same token, if I wanted to turn off auto-sleep I could easily do so from within Energy Saver Preferences. The two should be independent, so the user has the choice.
Why should I have to close my browser every time I walk away from my computer in order for it to sleep? I've acknowledged that in certain circumstance it makes sense for the computer not to auto-sleep: watching a movie, uploading, etc, but Apple has already accounted for those instances because the computer does not auto-sleep when those programs are running. All I'm suggesting is making the auto-sleep mechanism more sophisticated so that it isn't overridden by websites auto-refreshing.
Why the negative attitude, dwb? Based on the amount of time you spend in these discussion forums, you obviously never turn your computer off, so this doesn't really affect you. Maybe it's time to step outside and get some fresh air?

Screen saver + Energy Saver (Computer Sleep + Display Sleep) won't work since Mavericks

Howdy,
Sorry to bother you.
My computer: iMac (21.5-inch Mid 2011), Mac OS X (10.7.3)
It took me some time to upgrade to Mavericks, but I did it eventually.
After having some problems with Spotlight (which was infinite looping indexing... and I just had to turn if off from Terminal), I realized I was encountering another big problem to me since the installation of Mavericks.
In System Preferences:
- 'Desktop and Screen Saver > Screen Saver' : it is set to 1 minute;
- 'Energy Saver > Computer Sleep' : it is set to 10 minutes;
- 'Energy Saver > Display Sleep' : it is set to 5 minutes;
- 'Energy Saver > Put hard disks to sleep when possible' : it is checked.
- 'Energy Saver > Wake for network access' : it was checked. I unchecked it. Nothing changes.
- 'Energy Saver > Start up automatically after a power failure' : it is unchecked.
- 'Energy Saver > Allow power button to put computer to sleep' : this option is absent from my System Preferences > Energy Saver, but I would like it.
So, before Mavericks, everything was working great.
Now, after 1 minute, or after 5 minutes, or after 10 minutes: it's all the same. Nothing is sleepy. Nothing is energy saving.
I did not change anything in my computer since I've updated to Mavericks. However, I changed Wi-Fi. Since it was the only new change, I've "played" with 'Energy Saver > Wake for network access'. When I opened my System Preferences, it was checked. I unchecked it. It did not change anything. I'm not sure what it's used for.
I would appreciate any advice to make it work as it used to.
Thanks for your time reading and typing your answer,
Have a good day,
Regards,

- 'Energy Saver > Allow power button to put computer to sleep' : this option is absent from my System Preferences > Energy Saver, but I would like it.
Built into the Software now.
Do a backup.
Quit the application.
Go to Finder and select your user/home folder. With that Finder window as the front window, either select Finder/View/Show View options or go command - J. When the View options opens, check ’Show Library Folder’. That should make your user library folder visible in your user/home folder. Select Preferences/com.apple.systempreferences.plist. Move the .plist to your desktop.
Restart, open the application and test. If it works okay, delete the plist from the desktop.
If the application is the same, return the .plist to where you got it from, overwriting the newer one.
Thanks to leonie for some information contained in this.
You might try Spotlight again. That is how the App Store knows what is installed.

Solution approach to MANY issues where automatic sleep does not work

Hi
I had many issues for a long time where my machine would not go to sleep automatically. This annoyed me quite a bit.
I have read long ago that this might happen if an application writes standard output to the console. Those write "events" you do not notice as user as long as you never open the "Console" application and check...
my console was empty...
BUT I checked some other logs and I found that basically and frequent log written prevents the machine from automatically going to sleep.
In my case it was related to have "Firewall logging" enabled. The firewall logged every 3-4 minutes that it was listening..
I turned off "Firewall logging" and finally my machine goes to sleep again automatically after the specified time of no activity
Michael

Hello Michael:
That is interesting, and thanks for posting. However, I tested the premise on my own systems and the firewall logging did not prevent the Macs from sleeping on schedule. I do admit that I usually put them to sleep when I am finished with whatever I am doing.
I do have a strange anomaly that causes my iMacs to wake on random occasions, but that is not relevant to your issue.
Barry

Automatic sleep - won't wake up

My energy save settings apparently caused the G5 dual processor to SLEEP. Nothing would wake it up. Even the on/off button would not turn off the machine or turn it back on. Had to UNPLUG it and restart.
In System Preferences, most screens work. The one that doesn't is the one controlling the displays. I tried to turn off the hot corners and the Beach Ball of Death appeared.
I only got rid of the screen by FORCE QUIT of the preferences program.
I've turned off all energy saver settings.
Is there any other solution?

My energy save settings apparently caused the G5 dual processor to SLEEP. Nothing would wake it up. Even the on/off button would not turn off the machine or turn it back on. Had to UNPLUG it and restart.
In System Preferences, most screens work. The one that doesn't is the one controlling the displays. I tried to turn off the hot corners and the Beach Ball of Death appeared.
I only got rid of the screen by FORCE QUIT of the preferences program.
I've turned off all energy saver settings.
Is there any other solution?

Safari text-enlargement bookmarklet being changed automatically, so won't work

got iOS4, iPad1.
being unable to enlarge text is just about the stupidest omission i can think of. NO text online is large enough to be read on a 10-inch screen without straining your eyes. and zooming in and moving page back and forth on every line? why, that'd be too stupid for windows 95.
this post explains how to enlarge safari text:
http://www.everythingicafe.com/forum/threads/increase-font-size-in-safari-withou t-zooming.8403/
i tried 3 ways to save this bookmarklet: copy it on ipad, save on computer safari and sync, and finally laboriously typing it out on ipad.
result is the same each time, safari messes up the code, changing < to %3, rendering it useless.
some posters on there reported the same problem, but some got it to work.
this bookmarklet is still a stupid way to do it, have to hit it every time you get to a new page, but still better than having actual pain in your eyes after 10 minutes.
thanks much,
m

thank you for answering.
what you suggest might be okay for some quick browsing, when you read a few words here and there. still annoying and a time-waster, but doable.
my problem is reading pages and pages and pages that have wall-to-wall text like a news or wikipedia articles or a book, when you, as i wrote above, have to move the page with your finger left to right with EVERY line you read, which is insanely stupid.
i checked, and it actually is %3C, so like you said, it should work.
i guess i'll have to spring for PerfectReader, though i'm out of the country for a long while and no credit card, so it'd be a pain...
yet another brilliant apple accomplishment, like the earphone jack on my $2000 macbook which, like those of thousands who complain about it online, broke after few months of use.
best,
m

Automater-application won't work

Hi. I'm new to this forum but I got a problem with the Automator. I was on a hunt for an emulator or a program that could open up apks on my MacBook Pro. I found the Android-emulator from Google, but everytime I run an app it crashes within a minute. But then I read about that you could make your own application in Mac OSx using the automator. I tried, and failed. I managed to create the application, but everytime I try to open up an apk-file when associating it to my automator-application, I get the message: "The action "Run Shell Script" encountered an error. Check the actoin's properties and try running the workflow again."
I have no idea at all within these kind of things so I have no clue at all what I should do about it. Can anyone help me with this? Would be very satisfying to install and run apks on my MacBook Pro
Below this you can see my "code" and "actions"

vvikke wrote:
Well I rightclick on the apk-file and then I chose "Open with..." and then I choose the Autormator-application that I made... But I tried your suggesion on dragging and dropping the apk on the app, but it didn't work either :/
What happened when you dragged a file onto the app?
The app is designed to have files dragged onto it not ot be opened. If you open it then there is no file to pass to the shell script and nothing in arg $1 so toy get the error.

EA3500 IPV6 tunnel resets to automatic--Youtube won't work

Hi
This problem description pops up quite often when searching the net but I,ve never seen a resolution.
I have to go back into settings and deactivate the IPV6 tunnel daily to keep access to youtube. My provider does not support IPV6. Saving changes has no effect
Is there a way to ensure that the IPV6 tunnel remains deactivated?I have firmware version 1.0.30 build 126544 2011-12-24. Firmware update function says I got the latest version.
Thanks for any hint

batiscan wrote:
Thanks for the tip.
Would that mean that I'd have Toset up an account with the Cisco connect cloud? Isn't there another solution?
I believe upgrading to the Linksys Smart Wifi firmware would be the best thing you can do to resolve the issue.
How to manually upgrade the firmware of the Linksys Smart Wi-Fi Routers
Linksys Smart Wi-Fi Frequently Asked Questions
Benefits of using a Linksys Smart Wi-Fi Account?

"completion insight" and "change case as you type" won't work for sql file

Hi there,
Just updated to 3.1 on my Mac Lion. It's very likely a bug since it used the work with 3.0.
I have a "temp.sql" file where I store several queries. I start SQL Developer, open "temp.sql", connect to a DB but "completion insight" and "change case as you type" won't work anymore.
If I click in "Unshared SQL Worksheet", the new worksheet tab will work fine with completion and change case, but I want to use my temp.sql and save things there when closing the application.
To reproduce yourself the issue:
Open SQL Dev, connect to a DB (it will open a worksheet), do some queries and check that change case and completion are working, quit SQL Dev, but save the worksheet in a sql file before. Re-open SQL Dev and open the sql file. Connect to the same DB and try to change the queries or create another. Completion and change case won't work anymore.
About
Oracle SQL Developer 3.1.07
Version 3.1.07
Build MAIN-07.42
Copyright © 2005, 2011 Oracle. All Rights Reserved.
IDE Version: 11.1.1.4.37.59.48
Product ID: oracle.sqldeveloper
Product Version: 11.2.0.07.42
Version
Component     Version
=========     =======
Java(TM) Platform     1.6.0_31
Oracle IDE     3.1.07.42
Versioning Support     3.1.07.42

Well, it's partially working, if your sql file is big (like mine), say with more than 1000 lines, then, maybe because of memory usage, the automatic completion won't work as expected, though, sometimes, after a while, crtl-space would stil work.
So, the problem may have been addressed, but I believe this feature can be definitely improved.

Automatic sleep broken after 10.5.7 update

Hello,
Since I updated my 10.5.6 system to 10.5.7, the automatic sleep function doesn't work anymore. Screen goes black but harddisk keeps running (little light doesn't pulse).
I tried to repair permissions, reset SMC like described elsewhere in the forum, without any success.
Finally, I reinstalled 10.5 using the "Archive and install" option. Then applied the 10.5.6 combo update. And automatic sleep worked again.
After a few days, with the coming of Safari 4.0 final version (which only work with 10.5.7...), I decided to give it a try and applied the 10.5.7 combo update.
And guess what...
Automatic sleep is broken again...
If anybody has a solution, I would be happy to read it.
Thanks in advance

Some clues point to my external LaCie DVD±RW DL...
As long as it is connected to my MacBook, automatic sleep doesn't work. A green light is flashing at regular intervals, which indicate some sort of activity that could prevent the MacBook to sleep automatically.
To confirm this, I disconnected the external burner and... automatic sleep was working again. I checked the availables updates on LaCie website, but it seems that my burner's firmware is up to date.
I've sent a support request to LaCie, hoping they could do something about it.

Automatic sleep won't work

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