Previous 1 2 3 4 5 6 Next 81 Replies Latest reply: Aug 11, 2010 6:27 AM by kwikeeguy Go to original post
  • Fabian Aguirre Level 1 (5 points)
    All right, everyone. I was experiencing the infamous issue everyone has been describing (could not get the Samsung display to function correctly at optimum resolutions using a VGA-mini displayport), and the problem was "fixed" by switching my graphics from "better battery life" to "high performance". Obviously, this will only work on MacBook Pros with dual graphics cards, but the fix is immediate.

    I hope this helps.


  • snowmaker Level 1 (0 points)
    Unbelievable. This actually worked. I've been pulling my hair out ever since I installed Snow Leopard. Thank you Fabian!

    I have a MacBook Pro and an LG Flatron L222WT external monitor, which worked fine at high resolution (1680 x 1050) until I upgraded to Snow Leopard. After the upgrade, my external monitor would not work at its highest resolution--with the lid closed or open, mirroring or not mirroring. But it would work in the lower resolution settings.

    The screen would remain black with a floating window on the external monitor telling me to "Check Signal Cable". Every so often the image at the correct resolution would appear on my external monitor for 1/2 a second but the screen would immediately turn black and tell me to check signal cable.

    I tried all the other suggestions in Apple Discussions but this was the only one that worked--go to Energy Saver and switch your Graphics to "Higher Performance" from "Better Battery Life". You'll be logged out and when you sign back in, you'll be able to use your high resolution setting on your external monitor. Thank you again Fabian and others who took the time to post. These discussion boards can be a great tool.
  • Maxime_D Level 1 (0 points)
    I have an HDMI port on my External screen. I plugged my macbook (unibody october 2008) with this Problem fixed. Cheaper than buying a monitor.
  • barbakan Level 1 (0 points)
    It doesn't work here with a 13-in laptop, for it only has 1 graphic card (GeForce 9400M) and it's the driver for this card in SL 10.6.3 which causes the problem. The trick you mentioned works on 15-in and 17-in laptops because they have two graphic cards and by changing from Better Battery Life to Higher Performance, you actually switch to the other card, a 9600M GT.

    Any tip to fix it on a 13-in MBP ?
  • zemitch Level 1 (0 points)
    Does 10.6.4 fix this awful bug?
  • barbakan Level 1 (0 points)
    Unfortunately it does not! I tried this morning. I'm stunned that Apple hasn't corrected the drivers in the 10.6.4 as the issue is well known and appeared with 10.6.3...
  • greubeuld Level 1 (0 points)
    It's been more than a year we have been waiting for a permanent fix.

    Now that Apple has put hmdi on the newest macmini, I fear they will let go of miniDP. So I expect we'll never have a fix :'(

    What angers me the most if that the issue was fixed at some point in an update to 10.5 and broken again with 10.6 to never come back. This tends to indicates a software (or microcode) issue. Therefore I'm assuming it could be fixed if only Apple assigned someone to the task. (Plus some software workarounds exists by changing refresh rate with a third party app)
  • zemitch Level 1 (0 points)
    Try to install 10.6.4 --> I confirm that the bug is still here...

    Apple support gave send to me this mail :


    hank you for contacting us regarding the status of Bug ID# 7809015.

    At this time, there isn't any new information available for this issue. I have checked with engineering, and the issue is still being investigated.

    We will do our best to keep you informed as new information becomes available. Please be sure to regularly check the release notes for potential or related fixes that might affect this issue.

    If you have any additional questions related to this bug or wish to check on the status of this issue in the future, please update your report directly via the Apple Bug Reporter <> requesting a status update and we will provide you with any available information.

    Maybe you should all send a mail to Apple support about this issue, saying that this in now an urgent problem.
  • barbakan Level 1 (0 points)
    I fixed my problem this morning by reinstalling my Mac completely and stopping at 10.6.2. I don't regret it because it was the opportunity for a radical clean-up. The display is fine again but I found something interesting. Actually with 10.6.2 it offers me to display 1920x1080 at two possible frequency rates: 59.9 Hz and 60 Hz. With 10.6.2, in fact the problem will also occur if I select 60 Hz. It will not occur when I select 59.9 Hz. Hence the big issue with 10.6.3 and 10.6.4 is that, for some reason, a refresh rate at 59.9 Hz was not made available. Only 60 Hz.

    There is still an issue: the option to smooth fonts on LCD displays doesn't produce optimized results. But I can live with that, it's not so annoying.

    I filed a bug report yesterday with Apple. I will update it now. Whether it's been taken in consideration or not, I really hope they will implement a workaround, one way or another, in the next release, in order to fix this problem once and for all...
  • lazaro03 Level 1 (0 points)
    The issue has been reported since the next day 10.6.3 was released. So Apple should be ashamed of answering that the issue is being "investigated". They pay attention to the issues affecting most users, but they simply don't care about a "small" percentage of users like the ones with this external monitor issue. I, like most of the other affected people, had to go back to 10.6.2. And we will continue missing all the updates until we get a new computer or a new external monitor.
    Apple is a great company, but they always do things their way.
  • lonnymac Level 1 (0 points)
    Ok, I am also having problems with my Samsung 223bw.

    I have just moved to a new MacBook Pro, and found out that it doesn't like my external monitor.
    I am trying to install 10.6.2 as suggested here, but my installation disc is 10.6.3.

    Tried with my original SL disc (10.6.0) but it sends my Mac to kernel panic ****. Am I correct in assuming that my MBP will only run 10.6.3 and above, since this is the system it shipped with?

    And if that is the case... am I just screwed with my monitor?
  • mcha Level 1 (0 points)
    The past two updates have caused problems with my external monitor (I guess it's the graphics drivers). I had to downgrade to 10.6.2 when I updated to 10.6.3 - now I'll have to do it again.

    It's not a hardware issue, as my monitors work fine in Windows 7, running bootcamp!

    This is ridiculous!
  • kwikeeguy Level 1 (0 points)
    I was encouraged to see there was a fix, or at least something I could try, but when I go to Energy Saver I don't see any options for changing the graphics card settings. Just your basic Battery and Adaptor Settings. I assume this is because I only have one card.

    Like many others I had no issues at all using my external monitor at 1680 x 1050 until I went to 10.6.3. I was hoping 10.6.4 would fix the issue, but it obviously hasn't. APPLE....PLEASE HELP!!

    Message was edited by: kwikeeguy
  • lonnymac Level 1 (0 points)
    I am reporting to say that I have solved all issues.
    Got a new DVI cable and now everything works perfectly. Sounds strange, since the older cable used to work ok before, but with a brand new cable all issues are gone: rock steady image at full native resolution.
    Hope it helps!
  • zemitch Level 1 (0 points)
    Someone else can confirm that changing the cable solve the issue?