Mini Mac waking from sleep. A SOLUTION.

I had the same problem that everyone has:

Mini Mac won't sleep, requiring a shutdown and restart.

I found the cause of my problem. This solution has been tested.

Your system may differ from mine, but my solution can give you some ideas to try.

My system: Mac mini (mid-2011), running Lion.

On March 19, the eve of the day when the problem started, I sent a print job on my printer.

The next morning (20 March) the problem started and happened again on 21 March.

Exact symptoms seen: screen switch mode; However energy saving, the computer never goes sleep (front panel LED rest of suite, throughout the night, did not have his usual pattern of sleep slow breathing).

In particular, the "system.log" file shows the usual "alarm maintenance" wake up every 2 hours. The newspapers just go quiet.

Impression triggered the problem:

My printer is a recent model Brother laser printer.

Since March 19, I had been using Control-P to print documents;

However, at no time I turn on the printer; my intention was to accumulate my impressions for several days,

After that, I planned to turn on the printer and do my print and send all at once, for efficiency.

It helped me: this solved my problem:

March 21, I was wondering if something in the print queue prevented from sleeping.

Experimentally, I opened app leader brother printing and deleted the print job in the queue,

and BINGO, I instantly found the opportunity to sleep and wake my Mac mini.

Other tests have shown that the problem is reproducible at will. :^)

On 22 March, I tested the mini to ensure he sleeps and wakes.

Then I sent a print job to the print queue, leaving the printer off and tried to sleep the computer.

The problem comes back immediately: the display fell asleep but the computer does not.

Then I connected ssh via LAN and issued:

% lpq

for the number of working the print job, then

lprm % [jobnumber]

to clear the print queue of the printer.

This delete the print job, and the computer went to sleep immediately.

Moral: They say devices can prevent sleep.

Well, it shows that a device can prevent sleep without even be turned on!

Tip: If you * must * stop your mini, first try to connect to the local network via ssh and issue the

sudo shutdown - hour now

for a stop more ordered by limiting the risk of data loss.

PS. usually I can solve any problem of sleep if I ssh in from a different computer and question

killall % ScreenSaverEngine

but this does not work in this case.

This object could be turned into a 'trick' - If you want to.

Given that it is useful and not directed towards another user in a response.

Thanks for sharing!

Tags: Mac

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