SyncMaster Profile is lost after waking from sleep

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Level 1

116 points

SyncMaster Profile is lost after waking from sleep

I recently updated my Mac OS to Mt Lion (from Snow Leopard). The SyncMaster is attached as a 2nd monitor and was working just fine for years under Snow Leopard.

Now, under Mt Lion, while the SyncMaster does come up initially with the correct settings (1680x1050 - 60Hz) on a fresh boot — after the computer sleeps and wakes up it often (but not always) comes back with only a Generic VGA profile in the Display Preferences and the resolution is set to a less-than-useful resolution (1400x1050 - i.e., stretched too wide).

How can I get Mt Lion to retain its connection to the SyncMaster Profile when waking from sleep?

For reference, here is the Preferences after a (re)boot — note that it recognizes "SyncMaster" in the titlebar:

And this the the resolution, which is the correct setting:

Then, waking from sleep, it's now set to this — note the generic (VGA) rather than the SyncMaster in the titlebar:

And this is the resolution that it thinks is "best" — and there is no option to specify the desired 1680 x 1050 @ 60 Hz:

MBair, MBPro, Mini, iStuff

Posted on Sep 14, 2013 12:05 PM

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Answer 1

Aeaea

Level 1

25 points

Sep 19, 2013 8:50 AM in response to keriah

I have the same annoying problem with my MacBook Pro and a Syncmaster T240HD. When the display sleeps, sometime (but not always) it loses resolution and is set to a resolution where I can't see the left and right side of the screen.

I find if I unplug the monitor and plug it back in things are corrected -- but that's a terrible solution.

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Answer 2

Aeaea

Level 1

25 points

Sep 26, 2013 3:55 PM in response to Aeaea

One other option that's less extreme and much safer is to force the device to sleep (device sleep, not display sleep). When the Mac is woken back up, the monitor problem clears itself. It's still a hassle, but it seems to work for me.

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Answer 3

keriah Author

Level 1

116 points

Sep 27, 2013 2:55 PM in response to Aeaea

Yes, I've just noticed that! I've been trying device sleep for the last couple of days and had noticed that (so far) this method does not tend to lose the resolution settings when awakening. (I hadn't tested it enough to see if this works 100%.)

Another thing I've tried is to 'wake up' the screen (from screen sleep) using one of the computer's keyboard keys rather than clicking the (wireless) mouse or tapping the external keyboard key. When the screen wakes up from a mouse-click, it shows the normal display, then quickly flashes a solid/blank screen, and then comes back with the bad resolution setting -- like it was going out to search for the profile rather than simply waking up with the profile it last had. The odd thing about that is that if I leave the computer setup with the 'bad' setting on the 2nd monitor, let it go into display-sleep again, and then wake it up, it typically goes back to the correct settings ... like its toggling between profiles.

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