Late 2013 MacBook Pro Yosemite Video Flicker

When you have the problem, note the exact time: hour, minute, second.

These instructions must be carried out as an administrator. If you have only one user account, you are the administrator.

Launch the Console application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad. Click Utilities, then Console in the icon grid.

The title of the Console window should be All Messages. If it isn't, select

SYSTEM LOG QUERIES ▹ All Messages

from the log list on the left. If you don't see that list, select

View ▹ Show Log List

from the menu bar at the top of the screen.

Each message in the log begins with the date and time when it was entered. Scroll back to the time you noted above.

Select the messages entered from then until the end of the episode, or until they start to repeat, whichever comes first.

Copy the messages to the Clipboard by pressing the key combination command-C. Paste into a reply to this message by pressing command-V.

The log contains a vast amount of information, almost all of it useless for solving any particular problem. When posting a log extract, be selective. A few dozen lines are almost always more than enough.

Please don't indiscriminately dump thousands of lines from the log into this discussion.

Please don't post screenshots of log messages—post the text.

Some private information, such as your name, may appear in the log. Anonymize before posting.

I'm having this on a 2013 Mac Pro connected to a Thunderbolt Display. Here's my log from around the time at which it occurred:

2014-11-06 5:24:34.779 PM configd[25]: DHCP en1: INIT transmit failed

2014-11-06 5:24:42.907 PM configd[25]: [bootp_transmit.c:213] bootp_transmit(): bpf_write(en1) failed: Device not configured (6)

2014-11-06 5:24:42.907 PM configd[25]: DHCP en1: INIT transmit failed

2014-11-06 5:24:49.200 PM sharingd[34592]: 17:24:49.200 : Starting Handoff advertising

2014-11-06 5:24:50.124 PM com.apple.xpc.launchd[1]: (com.apple.imfoundation.IMRemoteURLConnectionAgent) The _DirtyJetsamMemoryLimit key is not available on this platform.

2014-11-06 5:24:50.142 PM com.apple.SecurityServer[54]: Session 100843 created

2014-11-06 5:24:50.400 PM com.apple.SecurityServer[54]: Killing auth hosts

2014-11-06 5:24:50.400 PM com.apple.SecurityServer[54]: Session 100841 destroyed

2014-11-06 5:24:50.400 PM logind[69]: -[SessionManager getClient:withRole:inAuditSession:]:241: ERROR: No session dictionary for audit session 100843

2014-11-06 5:24:50.400 PM logind[69]: _SMGetSessionAgent:73: ERROR: __SMGetClientForAuditSessionAgent failed 2

It happened at 5:24:46PM, and nothing showed up in the log at that exact moment.