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MacBook Pro screen blinks

354039 Views 1,620 Replies Latest reply: Mar 18, 2014 11:48 PM by accessd RSS Branched to a new discussion.
  • Benna Level 1 Level 1 (0 points)
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    Feb 29, 2012 5:07 AM (in response to Thorsten AB)

    ****, than is not just my me.... i had the same exactp impression in scrolling with double finger but i thought it was just a placebo effect!

  • CausticPuppy Level 1 Level 1 (25 points)
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    Feb 29, 2012 5:29 AM (in response to Thorsten AB)

    Thorsten AB wrote:

     

    It just works, awesome.

     

    I really like it that Apple finally found (and delivered) a solution. Even more, it seems to me that scrolling is much smoother now. Has anyone else noticed a change in scrolling?

     

    Bye

    I didn't get to use it long enough to notice a difference; but I was able to install the update on my March 2009 "spec bump" model (2.66GHz).  It's still identified as a Macbook Pro 5,1.  No blinking observed during the few minutes I used it after the update.

     

     

     

    I'm wondering if the "smoother" performance is a result of the 9400 being completely disabled now.  Maybe the update simply underclocks the 9600 in battery-life mode but uses the discrete GPU full-time.  Maybe I'm a pessimist; but I still can't figure out how an EFI update would fix a hardware issue.

  • CT Level 6 Level 6 (14,985 points)
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    Feb 29, 2012 5:36 AM (in response to CausticPuppy)

    I know what you mean.  Still, gfxCardStatus still seems to switch between the graphics modes. And System Profiler seems to indicate both are in play. The only other indicator I know of to tell which mode is being used (besides the blinking of course) is the termperature. So far it seems low, consistent with the 9400, but I'll have to watch it...

     

    charlie

  • Benna Level 1 Level 1 (0 points)
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    Feb 29, 2012 5:41 AM (in response to CausticPuppy)

    CausticPuppy: how can you know is an hardware issue?

    Just because of screen flicker? Maybe it was a simple memory leak that needs to be addressed.... there are milions of possible causes, i think nobody in here can tell what it really was.

     

    For sure temps and battery life will be observed for long after this update.

  • CausticPuppy Level 1 Level 1 (25 points)
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    Feb 29, 2012 5:43 AM (in response to Benna)

    I don't know for myself that it was a hardware issue, but that's just the impression I got from keeping up with this thread.  And based on the fact that there were known hardware issues with previous nVidia chips in apple notebooks.

  • Thorsten AB Calculating status...
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    Feb 29, 2012 5:43 AM (in response to CT)

    Wow,

    I have to admit this is way too much for me. I've never looked into this, so I cannot confirm any of it. But, for what I can tell, I go with CausticPuppy's opinion that it seems a bit strange that an EFI-Update could fix an hardware issue.

     

    But maybe you could tell us more in a week or two.

     

    Thorsten

  • CausticPuppy Level 1 Level 1 (25 points)
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    Feb 29, 2012 5:45 AM (in response to Thorsten AB)

    Given the age of these notebooks, doesn't it make more sense that Apple would just release a kludgy workaround than a real fix (especially if it WAS a hardware issue?) 

     

    Looks like I picked the wrong week to stop smoking crack.

  • Thorsten AB Level 1 Level 1 (0 points)
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    Feb 29, 2012 5:45 AM (in response to Benna)

    That's what Apple kept telling until yesterday (at least people wrote that in this thread).

  • Benna Level 1 Level 1 (0 points)
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    Feb 29, 2012 7:10 AM (in response to CausticPuppy)

    workaround, fix, these terms ar just.... terms.

     

    IF this fixes the flickering video

    IF this doesn't have any impact on the battery

    IF this doesn't have any impact on the temperature

    IF this still uses the 9400M videocard instead of the discrete videocard

     

    what do you care about the way they've implemented it?

     

    And BTW, i've just bought a late 2008 MBP and just after i brought it @home i've seen this issue, so welcome to this fix (or workaround) if this solves the problem, even 3 years and half later

  • LukeD Level 4 Level 4 (3,115 points)
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    Feb 29, 2012 7:22 AM (in response to LukeD)

    LukeD wrote:

     

    I have found further evidence that this issue is not faulty hardware, at least for me.

    I have booted from a "live" Linux CD of Mint 7, and I have experienced no issues.

    Everything that I have experienced suggests an incorrectly set refresh rate thanks to a driver conflict that has been caused by 10.6.2.

    I had called this a software problem back in November 2009! All those wasted logic boards. Wow!

  • LukeD Level 4 Level 4 (3,115 points)
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    Feb 29, 2012 7:25 AM (in response to LukeD)

    Here is my big question. The last firmware update for the MacBook Pro 5,1 had increased the RAM capacity from 4 GB to 8 GB. Does this new firmware update preserve the 8 GB increase, or does it bring it back down to 4 GB?

  • Benna Level 1 Level 1 (0 points)
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    Feb 29, 2012 7:26 AM (in response to LukeD)

    LukeD: i've got 8GB Crucial RAM and no issues found after firmware upgrade....

  • poochie2 Level 1 Level 1 (0 points)
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    Feb 29, 2012 7:30 AM (in response to LukeD)

    You clearly know little about the issue. Only OS X can use the 9400, windows and Linux are 9600-bound. The flickering issue was present long way before 10.6.2. I had it in 3 Oss. It was clearly a hardware issue since some other machines like 2009 MBP 13" only had the 9400 with no problems; and to us a logic board replacement often changed the frequency of the issue.

  • LukeD Level 4 Level 4 (3,115 points)
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    Feb 29, 2012 7:37 AM (in response to Benna)

    Thank you, Benna!

  • LukeD Level 4 Level 4 (3,115 points)
    Currently Being Moderated
    Feb 29, 2012 7:42 AM (in response to poochie2)

    Poochie2, my comments were reserved for the MacBook Pro 5,1, which was why this thread was started.

     

    Again, a clear way to test in the future would be to boot from a Linux CD. That way, hardware concerns can be addressed instead of needlessly replacing logic boards, which creates more issues than it solves.

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