macbookmacospower-managementsleep
I have a MacBook Air and I have noticed that even though I have configured it to put itself into sleep mode after being inactive for 5 minutes it sometimes stays awake.
I've usually got a bunch of programs open (Tweetie, iTunes, Safari, iChat etc) but it there some way I can find out which program/process that is preventing the MacBook from sleeping? (Yes, I know that I could probably reboot the MacBook and try one program at a time but that is pretty tedious)
I think the hard drives don't support Windows 7's new Power Management settings.
I'm getting regular Blue Screens of Happiness whenever I try to "wake up" my E-Sata external hard drive. I installed the newest Intel Raid drivers (which I hope contain some updated drivers) and it's better now, but still not perfect.
The default Power Management options in Windows 7 Beta turns off the Hard Disk after 20mins. This could cause problems when the PC comes out of sleep mode or hibernation. To work around the problem set the Power Options for the Hrd Disk to never turn off. To do this
- Click Start – Control Panel – System and Security – Power Options
- Click “Change Plan Settings” on the “Balanced (recomended)”
- Click “Change Advanced power settings”
- Under the “Turn Off Hard Disk after” option change the timing to “0″ which should set it to Never. Click Apply and OK.
It locks up because it is waiting for a synchronous I/O request to finish, that request takes longer because your hard drive appears to be in not working smoothly, indicated by the clicks you hear.
Three options to remedy the problem:
Find a way to keep the drive from spinning down. A scheduled write, perhaps? Or an option?
Disconnect the drive and use it only when you need it for a manual back-up.
Get yourself a new drive, because it doesn't sound safe to put back-ups on such drive...
Best Answer
Try this. It might work for you.
Go to Utilities in the Applications folder and open the "Terminal" app.
Type
pmset -gand hit EnterIf "sleep" has 0 next to it and the words "imposed by" or "prevented by ; The number next to the imposed by is the process ID causing the problem. Copy that number.
Type
ps -e | grep <process ID here>and hit Enter. This will list all running processes that have that ID (will also include thegrepprocess)In my case it was process id 19 which turned out in this instance to be a print server process. I went to "Print & Scan" in System Preferences and reset deleting all installed printers from there. . . Problem solved. I added the one printer that I needed and sleep still works. I don't yet understand quite how printing can get this way with the sleep mode.