I have a MacBook Pro (15-inch, Early 2011) i7 2GHz.
After upgrading to 10.10.3 the fan comes on permanently after waking from Sleep.
The Activity: discoveryd is using 100% CPU.
Shutting down rather than Sleep seems to stop this happening, so far.
I'm guessing this will be a "wait for the next upgrade" problem.
Try this:
Repair the Hard Drive and Permissions - Yosemite, Mavericks, Mountain Lion or Lion
Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
Repair
When the recovery menu appears select Disk Utility and press the Continue button. After Disk Utility loads select the Macintosh HD entry from the the left side list. Click on the First Aid tab, then click on the Repair Disk button. If Disk Utility reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit Disk Utility and return to the main menu. Select Restart from the Apple menu.
Download and install the OS X Yosemite 10.10.3 Combo Update.
I had two Permissions to repair. Otherwise all OK.
I have 10.10.3, are you saying install this Combo version again?
You did not install the combo originally if you upgraded using the App Store. I'm saying install the combo updater now after you do the repairs.
Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.
Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.
Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.
The login screen appears even if you usually login 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.
Test while in safe mode. Same problem?
After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.
OK. Thanks.
I did that and still get discoveryd heating up my Mac.
So that's disc verified and permissions verified and repaired and 10.10.3 Combo installed.
Thanks. I'm running with this now.
So now, in Safe mode (shift key during boot AND log-in) I have the same happening.
After Sleep and Wake discoveryd takes 100% CPU and gets my fans going.
I'm having this exact problem too! Just started yesterday after the upgrade.
MacBook Pro (Retina, 15-inch, Late 2013)
I fear the worst... it's still happening here after all the help on this thread.
Glad to hear it's affecting newer Macbooks too (although I'm sure you could do without it!). I was a bit concerned my old 2011 model might be nearing retirement.
Yeah, I'm bummed this is happening, but hopefully they'll find a fix soon. Good for you that it's not just the old models! 🙂 I did find a temporary fix from this thread:
sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist
sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.discoveryd.plist
That seems to work, but only for a bit. Sleeping/wake will probably cause the problem again...
What I have found is that if you don't Sleep you don't get the problem.
It is a pain but if you Shut Down and boot up I'm not getting discoveryd going mental.
Back up all data before proceeding.
Triple-click anywhere in the line below on this page to select it:
/var/folders/zz
Right-click or control-click the highlighted line and select
Services ▹ Reveal in Finder (or just Reveal)
from the contextual menu.* A folder should open with an item selected. Move the selected item to the Trash. You may be prompted for your administrator login password. Restart the computer and empty the Trash.
*If you don't see the contextual menu item, copy the selected text to the Clipboard by pressing the key combination command-C. In the Finder, select
Go ▹ Go to Folder...
from the menu bar and paste into the box that opens by pressing command-V. You won't see what you pasted because a line break is included. Press return.
Thanks.
That finds a folder with 60 files in it. Before I delete it I'd like to know (broadly) what I'm deleting and why it might help.
I have the same problem here, on a MacBook Pro 13" 2015. For now I just stop it using "activity monitor".
You'll be deleting temporary and cache files that are automatically generated. Not any of your own data.
After 10.10.3/sleep discoveryd runs 100% CPU
