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I'm trying to plug an external screen on my 2010 macbook pro 15", but when I set the maximal resolution, 1920*1080, the image seems a little constrained, and a big black vertical bar appear on the external screen. Here is a picture of it.

enter image description here

When I move my cursor from my macbook to the screen, the cursor goes straight from the edge of the MBP to the visible part of my wallpaper on the external screen.

When I set up a lower resolution, the problem goes away, but the display is then a little blur, because it's not the native resolution of the external screen.

Does anyone have any idea what I can do to have a good display ?

Thanks.

Edit

  • I tried various frequencies with no success.
  • I followed this post that seems really close to my problem: Mini DisplayPort to VGA adapter and Widescreen (FullHD) Monitor with no success. Deleting this /Library/Preferences/com.apple.windowserver.plist didn't fix the display.
  • This bug only appear with my MBP. Other colleague with same generation MBP have no problem to use this screen at 1920*1080. But I get this problem only with this screen and no other.
  • I tried to use another VGA <-> MiniDisplay, same result. Tried to use a DVI <-> MiniDisplay port, same result.

I'm pretty stuck on this one. Do you think I might call Apple?

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Are you using the right frequency? have you tried "resetting" your display settings to factory default or similar in the monitor? –  Martín Marconcini Jan 5 '12 at 21:55
    
@MartínMarconcini Yes, with no success, see my edit. –  Clement Herreman Jan 6 '12 at 10:39
    
I see you've tried everything. You haven't mention one thing. Can your colleague's MBP using the same cable/adapter/screen work without problem? You say he had no problem using the SCREEN, but don't mention if he was using the same adapter. If he was, then you will need to take your machine to an App store to see how that adapter reacts there. ALso try creating a blank new user and see if under the new user things work. –  Martín Marconcini Jan 6 '12 at 13:08
    
With switching cable and adapter, my colleagues have no problems. Thanks to @ioi I fixed this. –  Clement Herreman Jan 8 '12 at 17:42
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5 Answers

up vote 5 down vote accepted

Try this:

• Go into Displays Preferences > Check Mark the box for "Show displays in menu bar"

• Under the resulting icon in the menu bar, drop the menu and set "Number of recent items" to 10.

• Click the menu again and you should see a list of recently used timings/formats. Multiple 1920 x 1080 might appear, switch to one or the other and it might just fix your issue.

Also:

In Displays Preferences > Displays > “Options” tab/button near the top of the window and make sure the “overscan” box is checked.

It would be helpful to know if you're trying to run 1080i or 1080p, and what model of your external display is.

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Thank you, your recently used formats trick worked, even if I don't understand why... –  Clement Herreman Jan 6 '12 at 13:17
    
@ClementHerreman, awesome! I'm glad it worked for you. Apparently it's a long-standing bug that's never been squashed. ;-) –  l'L'l Jan 6 '12 at 14:09
    
Hm. I'm the famous colleague and I'm experiencing the same issue but with an other screen at home. None of these suggestions worked for me. Screen is a 27" Ilyama Prolite. –  Zenklys Jan 6 '12 at 21:34
    
@Zenklys: Sad to hear that :/ –  Clement Herreman Jan 8 '12 at 17:42
    
Finally, the issue was solved. Switched the VGA for DVI. Everything works great, out of the box. –  Zenklys Jan 16 '12 at 9:54
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Find out what the native resolution of the external monitor is and configure the Mac to output that exact resolution (and 60Hz refresh).

If you're using an analogue signal (VGA, often a blue plug), push the auto adjustment button on the external monitor afterwards.

If that doesn't fix it, reset the monitor's settings (in the on-screen menu of the monitor) to the default.

Edit: Still not fixed? Swap out the monitor cable and the Mac's mini-displayport adapter.

Edit 2: Also, get a new wallet.

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Hey, you don't like my wallet ? #sadpanda. Unfortunately, your solution didn't seem to work. Thank you anyway =) –  Clement Herreman Jan 6 '12 at 13:20
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I have got the same problem on my 2013 MacBook Air and Samsung SyncMaster S22B150 display. I have tried deleting the /Library/Preferences/com.apple.windowserver.plist file, but it made no difference. I cannot see the option to show the recent displays on 10.8, but there is only 60Hz (the display’s recommended setting) in SysPrefs. When it first worked, the computer could recognise the display's product code, but now it just shows up as Display. The computer works fine on other displays.

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Had the same issue with my 2012 iMac... Took the VGA-to-MiniDP cable out of the one tunderbolt port and put it in the other one and it works fine now.

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Simply changing the VGA cable fixed this problem for me.

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