Previous 1 2 3 4 5 Next 189 Replies Latest reply: Feb 23, 2015 5:41 AM by ibrowne2011 Go to original post
  • davorin Level 1 Level 1 (0 points)

    Got Thunderbolt display and iMac27 powered off during last night. ANd when I switched it back on this morning it reported after startup, that the harddrive attached to the display was unmounted ungracefully.

     

    No... all USB ports are invisible when I look into system profiler. ALso the internal USB devices are gone (FacetimeHD camera) as well as the brightness controll is gone in the monitor preferences for the Thunderbolt display.

  • davorin Level 1 Level 1 (0 points)

    Did a complete shutdown of iMac and Thunderbolt display...this time with no USB devices attached...

     

    Starting up iTunes plays music for maybe one minute over the Thunderbolt display loudspeakers and then stops...

     

    Interestingly the kernel log shows following then:

     

    Oct 28 15:09:46 imac27 kernel[0]: USBF:          241.174          The USB EHCI driver found a controller at the wrong PCI Power State (0xffff) - fixing that issue.

    Oct 28 15:09:46 imac27 kernel[0]: USBF:          241.288          AppleUSBEHCI[0xffffff8025be8000]::UIMInitialize - could not get chip to come out of reset within 100 ms

    Oct 28 15:09:46 imac27 kernel[0]: USBF:          241.288          AppleUSBEHCI[0xffffff8025be8000]::UIMInitialize - Error occurred (0xe00002c9)

     

    Oct 28 15:10:21 imac27 kernel[0]: USBF:          275.527          The USB EHCI driver found a controller at the wrong PCI Power State (0xffff) - fixing that issue.

    Oct 28 15:10:21 imac27 kernel[0]: USBF:          275.641          AppleUSBEHCI[0xffffff802a538000]::UIMInitialize - could not get chip to come out of reset within 100 ms

    Oct 28 15:10:21 imac27 kernel[0]: USBF:          275.641          AppleUSBEHCI[0xffffff802a538000]::UIMInitialize - Error occurred (0xe00002c9)

     

    Oct 28 15:10:46 imac27 kernel[0]: USBF:          301.293          The USB EHCI driver found a controller at the wrong PCI Power State (0xffff) - fixing that issue.

    Oct 28 15:10:46 imac27 kernel[0]: USBF:          301.407          AppleUSBEHCI[0xffffff8025a82000]::UIMInitialize - could not get chip to come out of reset within 100 ms

    Oct 28 15:10:46 imac27 kernel[0]: USBF:          301.407          AppleUSBEHCI[0xffffff8025a82000]::UIMInitialize - Error occurred (0xe00002c9)

     

    Oct 28 15:11:04 imac27 kernel[0]: USBF:          318.586          AppleUSBEHCI[0xffffff8025a82000]::UIMInitialize - could not get chip to halt within 100 ms

    Oct 28 15:11:04 imac27 kernel[0]: USBF:          318.586          AppleUSBEHCI[0xffffff8025a82000]::UIMInitialize - Error occurred (0xe00002c9)

    Oct 28 15:11:04 imac27 kernel[0]: USBF:          318.702          AppleUSBEHCI[0xffffff8025a82000]::UIMFinalize - could not get chip to halt within 100 ms

     

    Then no further USB entries in the logs...

  • davorin Level 1 Level 1 (0 points)

    Hmm...

     

    Display still flickers after this weeks update...

    Opened up a ticket with Apple but no reply so far...

     

     

    Getting worse now...display gets dark for several seconds now...

    and during that time the mouse is less responsive!

     

    Message was edited by: davorin

  • iTech23 Level 1 Level 1 (30 points)

    I'm still having the same problem here, I applied all the updates and got a new thunderbolt display as a replacement.

    I also have connected a regular 27" Apple display and is working perfectly fine.

  • iTech23 Level 1 Level 1 (30 points)

    I'm still having the same problem even after installing the update that was supposed to fix this issue, anyone else still having the black screen/flickering issue?

    Apple already replaced my Thunderbolt display and now they want me to take my 2 months old iMac to an Apple store so they can test it but I don't feel confortable doing that specially since it's a new machine.

  • Natejj Level 1 Level 1 (0 points)

    The EFI and firmware update seemed to take care of it for me.  I've not had any flickers since.

  • iTech23 Level 1 Level 1 (30 points)

    Thanks for your reply, unfortunately I also applied both updates but I'm still having the same issue.

    Thanks.

  • orchetect Level 1 Level 1 (10 points)

    This may only be circumstantial evidence, but...

     

    I've had my Thunderbolt display since the day they were released for sale.  Never had a single flicker or blackout.

     

    Until two days ago.  It now flickers every few minutes, totally at random.

     

    The difference?  I installed a new RAM upgrade in my 2011 Mac Mini.  Coincidence?

     

    I know Mac Minis (and some MacBook Pros) use system RAM for video RAM.  Perhaps not all RAM chips are fully compatible and may cause irregularities in video performance via Thunderbolt?

     

    Or perhaps it's just a coincidence.

     

    I suppose I could swap the RAM back to the factory set of chips to test this theory.  But I'd have to watch it very closely for several days to be (reasonably) certain.

     

    This theory may help explain why everyone who has their display replaced still has flickering problems.  It's not the display, it's the computer?  Although this could be determined by connecting a "faulty" Thunderbolt display to several completely different Thunderbolt Macs and see if the problem persists.

     

    (All software updates are installed.  I've unplugged and re-plugged the Thunderbolt connection a few times.  There are no peripherals connected to the display itself.)

  • Lester GrimeNose Level 1 Level 1 (0 points)

    Orchetect:

     

    You may be on to something. When I purchased my 27" iMac a few months back, I told the sales rep, "Max out the RAM." So she grabbed a RAM upgrade kit and took the new computer back behind the genius bar and had one of the techs install the additional RAM. I never would have associated the RAM upgrade with the flickering but perhaps that's the culprit.

  • iTech23 Level 1 Level 1 (30 points)

    Same here, when I got my new iMac I upgraded the RAM to 16GB.

  • Natejj Level 1 Level 1 (0 points)

    I ordered mine from the factory with 16 GB (did not upgrade it myself) and had the flickering problem from day one. 

  • orchetect Level 1 Level 1 (10 points)

    Very interesting.

     

    It was 16GB that I upgraded to, and that's when the flickering started.

     

    Here's the kicker:  Just before that, I had 8GB in for several weeks, and NO flickering.

     

    Am I sensing a trend here?

  • Column Level 1 Level 1 (45 points)

    Just FYI, I have a 2011 MacBook Pro which has been maxed out at 8GB RAM and I've never experienced the flicker on my Thunderbolt Display. 

     

    Interesting findings here!

     

    What happens when you take the RAM upgrades out?

  • orchetect Level 1 Level 1 (10 points)

    I'm not about to put the old RAM in just to test this.  I got the upgrade because I needed the memory - the machine could barely run on the stock 4GB with the apps I use.

     

    I've gotten into the habit of firing up Console.app to check system logs immediately after I notice flickering.

     

    One thing I've seen to be consistent, is this line showing up in the system log every time:

     

         kernel: Restoring DP Link

     

    Google doesn't help regarding the flickering, but informs that "DP Link" is the method in which video signals are sent over Thunderbolt cables.  I think it means DisplayPort Link, from Googling 'DP Link fail' and other related searches - and it seems other brands of monitors and PCs/graphics cards have had similar issues.  So I'm guessing that something is causing the DP Link to fail sporadically.  Could be software (ie, the OS).. or could be hardware.

  • orchetect Level 1 Level 1 (10 points)

    Also, for anyone who is curious (Hello: Apple tech support!) as to what the flickering looks like, this video sums it up:

     

    http://vimeo.com/21173450

     

    (not my video.. just found it)

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