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issue with minidisplay adapter and wifi

10789 Views 27 Replies Latest reply: Mar 19, 2010 12:08 PM by tibookg4 RSS
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tibookg4 Level 1 Level 1 (60 points)
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Sep 23, 2009 8:06 PM
I'm not sure if anyone else is having this issue, but my gf is having an issue when she connects her 13" macbook pro to her monitor via the minidisplay dvi adapter. When she connects it her wifi disconnects and has no internet access at all, but when she disconnects it the internet comes right back on. She's using a generic adapter but what would that have to with the wifi? She uses a linksys G router and is using 10.6.1
BlackBook C2D 2.16Ghz/3GB Ram/500GB HD, TiBook G4 1Ghz/1GB Ram/60GB HD/SD, Mac OS X (10.5.8), 16GB iPhone 3G (black)
  • DaddyPaycheck Level 6 Level 6 (16,035 points)
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    Sep 24, 2009 2:43 AM (in response to tibookg4)
    Have you checked with the manufacturer to see if the adapter is Mac compatible and whether or not they have a solution?

    It sounds like there is an incompatibility and the adapter is causing issues.
    A collection of clinking, clanking, clattering caliginous junk., Mac OS 8.6 or Earlier, PDP11
  • DaddyPaycheck Level 6 Level 6 (16,035 points)
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    Sep 24, 2009 6:44 AM (in response to tibookg4)
    Unless it is malfunctioning tis my line of thinking.
    A collection of clinking, clanking, clattering caliginous junk., Mac OS 8.6 or Earlier, PDP11
  • tele_player Level 5 Level 5 (5,380 points)
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    Sep 24, 2009 6:58 AM (in response to tibookg4)
    This thread caught my attention - because since switching last week from a late '06 Macbook to the Macbook Pro 13", my Wifi performance at home has gotten slow and unreliable.

    I'm using the Apple MiniDP-DVI adapter, connected to a 24" Dell monitor, which has worked great for a few years on my white Macbook. My base station is a Linksys WRTSL54GS, located about 20 feet away from my desk.

    So, I tried some speed tests with and without the DVI. Performance with the adapter connected is terrible, disconnected it's perfect. Further testing shows that positioning matters.

    When the adapter is turned back 90 degrees, leading the monitor cable towards the back of my desk, Wifi performance is bad. When I turn the adapter so it sticks straight out the left side of the Macbook Pro, performance is normal.

    This is a little weird, but an acceptable workaround for me.
    MacBook Pro 13", 2.26Ghz,2Gig, 160G HD, Mac OS X (10.6.1), Logic Studio 8, Focusrite Saffire
  • tele_player Level 5 Level 5 (5,380 points)
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    Sep 24, 2009 2:42 PM (in response to tibookg4)
    Just the Macbook Pro 13" and Dell 2405 monitor - haven't noticed any other Wifi issues, but it's only been a week.
    MacBook Pro 13", 2.26Ghz,2Gig, 160G HD, Mac OS X (10.6.1), Logic Studio 8, Focusrite Saffire
  • jp1101 Calculating status...
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    Oct 20, 2009 9:01 AM (in response to tibookg4)
    I've been fighting the same issues for the past month although I didn't link it to the DisplayPort adapter until a couple days ago. My network connection drops out and my Airport does not show up in the Airport Utility until I disconnect the adapter. The problem is intermittent for me which leads me to believe it is interference related as described above. If different orientations of the adapter lead to improved performance of wifi it sounds like RF interference. Also, I've tried both cheap MonoPrice adapters and an official Apple adapter with the same results. Also, I'm using a 20inch Dell display and an elevated laptop stand.
    Macbook Pro Mid 2009, Mac OS X (10.6.1)
  • timro Calculating status...
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    Oct 24, 2009 9:58 PM (in response to tibookg4)
    I had the same problems with a Monoprice Mini DisplayPort to HDMI adapter, and I was getting no internet wirelessly from the moment it was plugged in. As soon as I unplugged the adapter, I'd get internet again. I followed the advice of someone on another post on this forum (but I closed it so I can't find it again) and got it fixed.

    They recommended changing the channel of the wireless signal on the router. After two or three tries I found one that worked (channel 1, lowest it would go) without a problem. Props to whoever had that suggestion, sorry I don't remember your name!

    Hope this helps any of you guys with the same problem.
    MacBook aluminum 13" (late 2008), Mac OS X (10.6.1), Monoprice Mini DisplayPort to HDMI adapter
  • nintendew Calculating status...
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    Oct 28, 2009 1:39 AM (in response to tibookg4)
    I'm experiencing the same problem with my 17" MacBook. The Mini DisplayPort is interfering with WiFi. Unfortunately I cant change my school's WiFi signal. It's weird that I can get more reliable connection by placing my hand over the left speaker.

    Has anybody gotten this repaired successfully by the geniuses at Apple? I'm a little reluctant parting with it right now.
    MacBookPro5,2 17", Mac OS X (10.6.1)
  • jp1101 Level 1 Level 1 (0 points)
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    Oct 30, 2009 3:19 PM (in response to timro)
    Thanks for the advice. I wanted to mention that this problem only appears to happen in the 2.4GHz range. Initially I thought my old Airport Express (2005) was the problem. I bought one of the new 802.11n compatible models and the problem went away. At the time I assumed that the old Airport was causing the grief.

    A few weeks later I had to connect a device to my network that wasn't 802.11n compatible. I reconfigured the Airport to run at 2.4GHz instead of 5GHz. The problem returned instantly. After reading your post about dropping the channel to 1, this all makes sense now. The display port adapter must be emitting RF in the 2.4GHz range. Pretty lame. Anyone know where to find an FCC certified mini displayport to DVI adapter that does "not cause harmful interference"?
    Macbook Pro 2.8GHz, Mac OS X (10.6.1)
  • benmmc Calculating status...
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    Oct 30, 2009 8:10 PM (in response to timro)
    Dropping the channel to 1 fixed this issue for me!
    MacBook Pro 2.66 GHz, Mac OS X (10.5.8)
  • Morn Level 1 Level 1 (30 points)
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    Nov 1, 2009 6:38 PM (in response to tibookg4)
    I have this issue with 17" unibody.
    A 3rd party displayport to dvi connector. Plug it in and the wifi starts losing packets and totally stalling.
    Macbook Pro 17" Unibody, Mac OS X (10.6.1)
  • Morn Level 1 Level 1 (30 points)
    Currently Being Moderated
    Nov 1, 2009 6:43 PM (in response to benmmc)
    Ha, score!
    Worked for me too.
    Macbook Pro 17" Unibody, Mac OS X (10.6.1)
  • wdeerfield Calculating status...
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    Nov 4, 2009 10:19 AM (in response to tibookg4)
    I posted this in another thread but found this one as well:

    I am having the wireless problem as described when connecting to my external display via miniDisplayPort to DVI. Ive gone through 2 mDp-dvi cables (apple product and monoprice) with both having the same effect, as well as two dvi-d cables. I am hoping there is a fix for this as this problem just occurred within the last two weeks randomly.

    So what does putting the router channel to 1 do for performance of the wireless? I will have to try that.
    Macbook Pro, Mac OS X (10.6.1)
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