MBA not always recognizes external display after sleep

Hi,
I have a 2011 MBA and use it on a external display (Dell 2709w) with the lid open. The issue with this MBA is that after sleep it often (every second time I wake it up) doesn't show anything on my external monitor. In order that the external monitor works again I have to plug the DVI cord out and in or press recognize monitors under monitor settings.
I also did a PMC and SMC reset but both did not help.
I have also done a complete reinstall witch did not help as well.
I also did a test with a MBA from a friend (exact same model) and his always works with the external display after sleep while mine only works every second time.
Could this be a hardware defect? sound pretty strange to me, but who knows...

I have managed to make the Apple Hardware test by just pressing "D" while restarting. The test, however, did not find any error - but this does not surprise me as I think it only tests the ram.

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I see that you are having issues with your external display since the update to Yosemite. I would like to suggest that you perform a PRAM reset to see if this troubleshooting step affects the issue:
OS X Yosemite: Reset your computer’s PRAM
http://support.apple.com/kb/PH18761
There are some further troubleshooting steps found in this article as well:
Apple computers: Troubleshooting issues with video on internal or external displays - Apple Support
http://support.apple.com/us-en/HT201177
Thanks for coming to the Apple Support Communities!
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http://gizmodo.com/5938452/a-trick-to-make-using-an-external-monitor-with-your-m acbook-way-better
and in the bottom comments there was a section that read as follows:
"Closed Clamshell Mode is still a function of the OS. Here's how: close the lid of portable, plug into power, monitor, and keyboard/mouse, wake portable by clicking the mouse or hitting a key on the space bar. Important note: portable has to be plugged into power, even if the battery is full."
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MBA not always recognizes external display after sleep

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