Macos – Static / snow on external display when waking up Mac

external displaymacmacostroubleshooting

I have a Philips 222E display connected via a mini-DP to DVI adapter and DVI cable to a Macbook Air (mid-2011).

Every time that the MBA wakes from sleep, the display shows this static:
enter image description here

The static is replaced with the proper desktop image after around 20 seconds, or after a power cycling the display (which could take only 10 seconds but is highly annoying just the same.)

Things I tried and their results:

  1. A different display (LG) – no static
  2. A different computer (Mac Mini) – no static
  3. Different adapter and DVI cable – static remains
  4. When booting the MBA (not rebooting) – no static
  5. When disconnecting and reconnecting the 222E to the MBA – no static

Best Answer

I've been investigating a little bit and would be good for you guys have a try with this steps. The steps are written for a different type of Display, but can get the idea:

  • Under "SIZE & POSITION" menu, go to "Image Size" and set to "Screen Fit"

  • Under "SETUP & RESET" menu (down on the second page with my model), go to "Auto Source" and set to "Manual"

  • Finally,still under the same "SETUP & RESET" menu page, go to "PC/AV Mode" and set to "AV"

Bingo! Now when the computer wakes up from sleep, the screens are going back on like a charm!

Here's the source:

https://discussions.apple.com/message/13221480#13221480

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