Same here. I have 2 Thunderbolt displays connected to my relatively recent Macbook Pro (pre-retina display). The flickering appeared after the last update of Mountain Lion to 10.8.1. I didn't see these problems earlier. It is usually the daisy chained display at the "far end" from the Macbook Pro.
Working is hardly possible with this problem present. Is there any way to revert to Mountain Lion 10.8.0?
We are also having the same issue: hardware: mid 2012 Macbook Pro, 13, 10.8.2 OS X. We do not have comparable hardware available for testing immediately, but there is another laptop we could test - perhaps, test with Lion OS X and see if the issue is specific to Mountain Lion OS X.
Edit: I am testing on similar harware/OS combination now: 10.8.2, 13-inch MBP. Post results by this week.
Message was edited by: fwsmroldan
Unfortunately not. It is rather getting worse. It prevent (or delays for a long time) the booting of the MacBook. A temporary fix is to disconnect it from AC and everything else for some time (> 1hour). The it works okay until the next reboot. Sometimes when booting I also notice a "color spray pattern" on the display, which disappears when the normal screen appears.
The problem is that all these phenomena are sporadic. When I'll take it to an Apple store it will certainly work okay for a moment, as it has been disconnected from AC. So this one is difficult to prove...
I might have found a temporary fix.
The flickering has stopped since I disabled the "Automatic Graphics Switching" in System Preferences > Energy Saver.
I use the word "might" because I then re-enabled it and the flickering hasn't returned. Maybe it just needed a little kick...! There are sporadic rendering errors in Safari which are apparently due to the graphics switching, so I wonder if these two problems are related? 10.8.3 is supposed to go some way to addressing the Safari issue, so fingers crossed for the display flickering too!
Automatic Graphics Switching has been disabled for me at all times (I'm using the MacBook Pro more in a desktop mode). I disabled this as well as the sleep mode because the Thunderbolt devices didn't come back from sleep mode properly and I had to reboot - which defeats the purpose of the sleep mode. As I have 3 Thunderbolt displays and the flickering only appears with one I suspect a hardware related issue.
Sorry for posting yet another thread to this post, but reading the many posts in this thread I am unsure which solution/approach will resolve the flickering issue I am experiencing.
I recently received a newish laptop with MacBook Pro for work
- 2GHz, Memory
- 4GB 1333 Mhz DDR3
- AMD Radeon HD 6490M 256MB
- running Mac OS X Lion 10.7.5
I have it hooked up to an older Cinema Display (2008) 24 inch
AMD Radeon HD 6490M 256 MB graphics
It flickers every 3-4 minutes and then eventually turns off. I went to the apple store and they indicated my computer is too fast for the monitor...but since I did not bring in the monitor to demonstrate the flickering, it was an educated guess.
Can someone confirm if this is indeed the case and/or if there is anything I can do to resolve this. I am trying to upgrade my monitor for work and they think it may be the video card in my laptop..which has never failed while projecting to an LCD projector.
At least for my case I can tell that the computer isn't too fast (which I doubt could be causing the trouble anyhow, as the thunderbolt interface should mitigate). I noticed, that the computer sometimes doesn't even boot with the second "malicious" display connected. Only after disconnecting the display from all (including AC! power) connections for some minutes, it will return to duty. Once "connected" it stay well on duty as long as I don't turn the computer off. If I wouldn't know better I'd take a guess that the display has some earthing or ES charging issue.