Issues with "Higher performance" setting on Macbook Pro with external monitor

Hi all,
I rarely used the "Higher performance" setting in the Energy Saver pane of System Preferences.
I use my MB connected with an external monitor, with its own screen closed. I tried to switch that setting on and the external monitor seems to repeatedly turn off and on. This strange behaviour vanishes if I open the MB's screen, using it in a double monitor configuration.
Did anyone hear about some similar problem?
p.s.: I don't know if this is the exact location for this thread, any suggestions is welcome

It was set to 1080p, 1920x1080 did not show up as an option (even when holding the option key). 1080p should be equivlant. As as experiment I grabbed another monitor that was not being used. It is a 22 inch LG with a maximum display of 1920x1080, and its currently set to 1920x1080. The issue is a little different, was not detected as a TV this time, but the screen still looks blurry. There may be some improvement but not much.

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Hi,
I recently purchased a new MacBook Pro with Retina display. I plugged in an external monitor for the first time today and noticed that the screen looked blurry. I have seen on other forums that its a font smoothing issue but I ran that command in the terminal with no sucess. In my case its just not the font that is blurry, everything is blurry. I believe the problem is stemming from OS X detecting my external monitor as a television. Is there anything I can do to fix the issue or am I stuck waiting for Apple to update their video drivers. As a developer I like having as much screen space as possible but reading text on the secondary monitor is giving me a headache its so blurry.
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If I understand correctly, the external monitor was blurry from the moment you plugged it into your MacBook Pro with Retina display. I would first check the resolution settings for the monitor with the "How do I select additional resolutions on my display?" section of the following article:
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Here's my situation (sorry for being verbose, I just want to be thorough)
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Obviously, FireWire is a fast connection, but for changing metadata, USB is plenty fast. Why it takes so long is anyones guess. Is it a USB 2.0 drive? Using external drives can be tricky. My father uses them for his gigantic library of almost 80,000 songs. When you have it setup properly, it works fine, but if you say forgot to have the external drive mounted when you launch iTunes, iTunes defaults the library back to your Music folder, then when you start importing, it puts in on the internal drive, then you have to go back and reset it, etc. Problem, with iTunes alone, you can only set one library, so if you want to use two drives, you will have to have one set at any given time.
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I recently upgraded to a new 13 inch MacBook Pro to replace my previous one. With the upgrade, I'm now on the latest OS and I have a Thunderbolt instead of Mini-displayport output. I have a Dell U2410 monitor which has worked great up until now, but I now have the following behavior:
When the laptop sleeps (or puts the display to sleep) the monitor begins to turn on and off. It goes to powersave mode and immediately wakes up, realizes there's no signal, and goes back to powersave mode, etc etc etc.
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I'm on the latest 10.8.3. My adapter is the same adapter I have been using for years, an apple mini-display port to DVI adapter. Supposedly this adapter is still compatible with the Thunderbolt port.
I've seen lots of issues online about wake up issues with the latest OS. Is there a workaround for this yet or do I have to uplug my monitor anytime I sleep the computer?

Hi Steve,
I have had the exact same issues after adding a WD Thunderbolt Duo external drive to a Mid 2011 iMac and then daisy chaining the Dell U2410 monitor off that.
My Mini DP to DVI cable ceased working properly - sleeps issues.
After buying one of these adapters of Ebay:
http://www.ebay.com.au/itm/3-in-1-Mini-Displayport-to-HDMI-with-audio-DVI-DP-ada pter-3in1-convertor-Macbook-/110861703462?pt=US_Audio_Cables_Adapters&hash=item1 9cfdf5926
I then tried all the different cables that came originally with the Dell U2410 with that adapter, and none of then would put the U2410 to sleep properly. The backlight would stay on, or "No Displayport Cable" would float around the Dell display with the backlighting still on. Or otherwise the Dell would try to go to sleep and then wake up again and cycle like you found.
Apples Mini DP to VGA adapter was sleep successful with the VGA cable (Analogue) but the output picture was not as sharp as DVI or Displayport, plus there was RF interference with the cable.
After lots of internet searching I have found a near perfect solution:
A HDMI to DVI cable with the HDMI end connected to the Ebay 3 in 1 adapter, which then connects to the Thunderbolt port.
Connect this to DVI-D 1 on the Dell U2410.
On the Dell in Menu - Other Settings, disable DDC/CI
Now in OSX Settings - energy Saver you will have to tick:
"Put Hard Disks to sleep where possible" and select a short time frame for "Computer Sleep"
I have found that the display would go black but the backlighting on the Dell U2410 would stay on, when the display went to sleep on the Mac as per the Energy Saver "Display Sleep" setting.
The backlighting on the Dell would only turn off when the time for 'Computer Sleep" has elapsed and the external Thunderbolt hard disk went to sleep as well.
The Dell U2410 would then wake up correctly as well when my iMac woke, with this setup.
Cheapest solution for you would be to try an Apple or Ebay HDMI to DVI adapter and then use the DVI - DVI cable that came with the Dell.
If that fails get the 3 in one Adapter and use my Mini DP/Thunderbolt to Ebay Adapter to DVI-DVI cable setup.
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Hello mmholt,
Welcome to Apple Support Communities.
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So long,
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I have a mid year 2010 17" MBP and needed to do the same thing.
I got a mini-DVI port adaptor to HDMI, and connected it to my stereo - so I could watch on big flat screen TV and hear 5.1 sound via surround speakers, works great. I down load missed episodes of castle and stuff and watch them all in HD. (Via ITUNES).
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Hello all,
Long story short, I have a 13" late 2010 Macbook Pro and have been using my Moshi mini display to hdmi adapter to extend my display to either a television or a monitor. No matter the external display they both support 1080p yet when I plug my mbp into it, it can't scale correctly unless I underscan it. If i don't underscan it I lose half of my dock and the tool bar is invisible.
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I had a similar experience with my external monitor - the MBP was in mirror mode and the external monitor's resolution was only as high as my MBP laptop monitor resolution.
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