I have a really strange issue since i updated to Yosemite.
When i wake up my 2012 Mac Pro, the network connection is totally lost.
Output from dmesg (sorry, couldn't copy/paste at this time):
- Nic en0 - no link detected
- Nic en0 - link detected
- some other things (approx. 2 sec)
- Nic en0 - no link detected
Disabling/removing and adding/re-enabling in System Preferences didn't solve the issue. Only rebooting the whole machine will help. Interesting: If i remove the cable from en0 and put it in en1 (Mac Pro has two NICs), everything is fine – until next sleep/wakeup. After the next wakeup en1 is also not working. Only thing which helps is rebooting.
Tried also resetting the SMC – didn't solve it.
Best Answer
It appears to be a common issue until ~ OS X 10.10.3. I'd say your only option is to upgrade when it comes out or do a clean install of 10.10.2 and see if that works out for you. I can understand that you'd rather not do a clean install but it does actually solve a lot most of the time.