MacBook Air slow after waking from sleep

cpukernelmacbook prosleep-wake

The backlight on my MacBook Air broke about a week ago and it fixed by Apple by them replacing the logic board. Since I've got it back I've had a couple of issues. Firstly, the machine wouldn't work unless plugged in and the battery wasn't available, I sorted this through resetting the NVRAM and PRAM and that's now working fine.

Secondly, when I wake the computer from sleep it is very slow and the fans come on very loud as well, things like moving the cursor across the screen and jittery and not fluid, likewise opening applications takes forever. I did manage to open Activity Monitor, I got a CPU system load as 87% and a kernel_task as 310.8% CPU.

Any ideas as to what may be causing it? Or is a fresh install the best option and see if that solves the issues?

Thanks!

Best Answer

Starting in Safe mode should eliminate 3d party applications causing that.

Resetting the SMC should resolve remaining issues with Battery, power ect.

Running Apple Hardware test (twice) to verify no issues there (since the logic board was replaced). Look for RAM issues.

Finally a Console log could tell you who is doing what.

Related Solutions

MacOS – MacBook Air has delay when waking from sleep

Airs do go into standby mode more readily than other macs.

MacBook Air (Late 2010) and later: About standby mode

Assuming its not just the extra time to exit standby mode (and isn't really sleeping anymore), have you checked the startup disk preference as the article above recommends?

You may have to look in the console log for sleep / standby messages in case your mac is entering standby / hibernate earlier than the expected one hour. The pmset command can show you the details of your Air's power management settings. Here's what a Mid 2011 Air looks like with mostly default settings:

mac:~ me$ pmset -g
Active Profiles:
Battery Power       -1
AC Power        -1*
Currently in use:
 standbydelay   4200
 standby    1
 womp       1
 halfdim    1
 panicrestart   157680000
 hibernatefile  /var/vm/sleepimage
 networkoversleep   0
 disksleep  10
 sleep      10
 hibernatemode  3
 ttyskeepawake  1
 displaysleep   10
 acwake     0
 lidwake    1

You can also use pmset to change either the number of seconds before standby kicks in, which is standbydelay; or turn standby off completely by setting standby to 0. Use the command man pmset for details.

MacBook Pro Retina 2012 – sensor issue

The temp sensor is in the track pad so if you choose to undertake this repair, this is the part your are going to have to replace.

The PN# for the track pad for MBP 2009-2012 is PN# 922-9063. The good news is that it's under $30 at the time of this writing.

To change out your track pad, you will need to remove the battery from the top case assembly. iFixit.com has an excellent tear down which details how to do this.

Note: You won't have to completely disassemble the unit, but you will have to remove the battery to gain access. You can remove it by gently prying it up with a plastic putty knife. I have even seen dental floss used to slowly work the battery loose.

If you are not comfortable doing this repair, I suggest you let a tech handle the repair.

I was able to find a YouTube video showing the battery removal. Once it's removed, you will be able to get a good idea of where the track pad is located.

Best Answer

Related Solutions

MacOS – MacBook Air has delay when waking from sleep

MacBook Pro Retina 2012 – sensor issue

Related Question