sleep wake problem with Yosemite on my Mac Mini Mid 2012

Same problem here my machine specs, freezes after wake from sleep after upgrading to 10.10 went back to 10.9 running stable again no freezes, kind of a letdown

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I just bought a MAC Mini late 2014 version with Yosemite pre-installed, and got a similar sleep wake problem.

It's connected to an ASUS IPS 27" screen using HDMI interface. When the Mac goes to sleep after 15 min, or when I press the button to force it to sleep.

If you type on the keyboard and the trackpad within 1 minute (before the screen also goes to sleep because of no HDMI signal), then the wake up will work.

If you wait till the screen goes to sleep also, then no matter how hard you pound on the keyboard or on the track pad, the MAC will not wake up.

The only way to wake it up is to power off the screen, then power it on again. Then type on the keyboard or move your track pad while doing that.

This is really annoying. I have to set to "Never" turn the display off to avoid this issue.

Called the Apple tech support who recommended I set up the energy saver like this below. But still could not fix the issue.

He told me to bring the Mac mini back to the shop to check. I doubt it's a hardware issue. It could be a software bug that someone,

The setting of "Prevent computer from sleeping automatically when the display is off" is not in effect.

See, when the computer goes to sleep, there is no more HDMI signal, then the screen also goes to sleep.

And if "Prevent computer from sleeping automatically when the display is off" is not in effect, then even if you type on the keyboard, the computer will not wake up as the screen is asleep. The screen will not wake up as no HDMI signal comes from the computer.

This turns into a viscious cycle, or a deadlock. Nobody is waking up.

This is simple logic. I don't know why systems are designed to work like that. Just too annoying....

I hope apple can fix this software bug asap.

I did try to convert my HDMI cable to min-display port and try to plug that into the thunderbolt port to see if it helps.

The same issue appears. The only difference is, with the HDMI port, once I am able to wake up the computer by power cycling my screen, i will see that I am prompted with a login screen, even if I set up my computer to auto login.

but when I use the display port, when I managed to wake up the MAC, it bypasses the login screen.

I should add - thanks to the individual upstream that discovered this - that after unplugging the 3.5mm line from the headphone/line out jack to the powered speakers; I have not had to force-shut-down my system and restart it, to get in after a long system sleep. 🙂

Sound now goes via HDMI to the display. But, sadly enough now I can't do volume up / down from the keyboard anymore. Instead have to fiddle with the tiny display buttons.

Under preferences (without speakers) it lists as outputs:

-internal speakers

-display

-apple tv

-airport express

When I plug the speakers back in, "internal speakers" changes to "headphones"

Only additional sleep/login oddity is that where before, using the betas I very often had some grey brushed linen background (login worked) and fuzzy version of the background (could not log in); now more often than not since the official version, the login background is entirely pitch black. Which I actually prefer over the craptastic blurred 256 color version of my actual desktop. But strange nonetheless.

The audio fix worked for me too. I connected my speakers to my monitor (which is connected through HDMI). No problem waking from sleep now.

However, the volume control on my Mac is greyed out (i.e. I can't control the volume – not through the keyboard, or by clicking on the volume control). Anyone know why?

I think it is just passing it through like a digital line out to a tv, then you control the volume there. My monitor has volume control.

To prove that it is the headphone jack. Plugged my regular speakers back in to the headphone jack. System went to deep sleep. Woke it up. Sure enough get the fuzzy background screen with a locked up login screen that I can't interact with. Sigh. Stupid stupid bug.

Some updates on this. I tried two other 22" screen. Both of the seems to be working fine with sleep wake, but takes between 40 sec to one min to wake up after you typed something.

Topcon hdmi 22" screen

17 sec after keystrokes to turn wake screen

40 sec to wake computer

AOC hdmi 22" screen

19 sec after keystrokes to turn wake screen

38 sec to wake computer

I tried to switch to two other HDMI cables to see if it'll improve the situation of my original ASUS VX279 IPS HDMI screen.

But it didn't. Still never wakes up after it the MAC goes to sleep until you power cycle the screen.

I guess there is some hardware compatibility issue here.

Let me bring my mac mini to the shop to see if a replacement will help.

It is certainly related to DP display.

Mac mini 2011 base model.

two monitors

- mini DP to DP: 2560x1440 with audio

- HDMI to DVI: 1920x1080

- When I tried to wake up after long sleep...

DP display is not waken.

DVI display is on but freeze. (no mouse movement)

I thought it was crashed but I realized today that it is not crashed.

- What I did...

Disconnect DP cable.

Turn off DP monitor.

DVI display is now main and only display and mouse movement is back on.

Click 'Sleep' in Apple menu.

Connect DP cable and turn on DP monitor.

Touch any key to wake up.

Now both monitors are working well.

Resetting PRAM and SMC seems not relevant.

I found one odd thing... wrong display type in "About This Mac"

- actual monitor: DISPLAY PORT 27" 2560x1440

- displayed: DISPLAY PORT 30.5" 1920x1080

Can this be the cause of problem?

There was no problem with Mavericks before.

I am new to this thread. Interesting because I have had a similar symptom on my late 2013 IMac since installing Yosemite. Twice the computer restarted "because of a problem" instead of waking from sleep (or I had to push the power button because it couldn't wake). Also, this happened once while I was web browsing, screen went black and a "your computer needs to restart because of a problem" window appeared... translation: kernel panic. Apple support has been unable to solve the problem (we deleted all the start up programs and did a new install... not a clean install though... to no avail). Other weird symptom is that the "controlled outlets" on my battery backup think the computer is waking, going back to sleep, waking again, etc. while the computer is asleep. APC is replacing the battery backup, as they think it might be at fault, but I am wondering if it is any issue with Yosemite (we did set the threshold of the battery backup properly). I think there is something fundamentally wrong with Yosemite that is causing all these problems that everyone is seeing... basic power, sleep or something issues. Another related symptom: bluetooth mouse and trackpad are unresponsive for almost 45 seconds after starting up the computer... this was never true in Mavericks.

I have sent Apple my crash reports (emailed screen captures to the apple tech persons trying to help me too), but this program needs an update to fix these issues pronto!

In the meantime, does anyone have a clue how I might solve these issues? Should I unplug my speakers from the headphone jack for now?

Thanks, Vic. I have Monsoon speakers, which I like very much, plugged into the headphone jack of my iMac. Not going to replace them. I use them regularly, but perhaps I will simply unplug them when not in use. Can't wait for an update to fix this issue... it's nuts.

Dan

I am also experiencing the issue since my upgrade to Yosemite. I have a Mac mini from 2012 and apple wireless keyboard and trackpad.

My Mac has hung (windows still visible and mouse moves but no other response works). Rebooted on its own, Hung on reboot, wake from sleep mode but no password needed, etc. Am considering going back to Mavericks on a clean install but would like to try some of the suggestions listed here first. This is just a post to show that this is an issue with the new OS.

Funny thing is I just switched my bose speakers from my windows pc to my mac mini 3.5 jack when I did the upgrade. Hmmm.

I don't think it's a problem with the OS. If you read back through these posts, you'll find that they are all about the Mac Mini. It's a hardware problem, specifically with the Mac Mini, that existed before and has been exacerbated by the arrival of Yosemite. In fact I had the issue with Mavericks and I still have it with Yosemite.

It's interesting to read all these"solutions", that have helped users themselves to identify the source of the problem, which seems to have something to do with plugging/unplugging various things. That's only useful up to a point, and doesn't fix the problem. In my own case, it is just not practical to be plugging/unplugging stuff every time I just want to sleep the computer.

No, that is not the case. I have the same Mac Mini for almost two years now, and never (really never) it failed to wake from sleep before. After installing Yosemite, this happens every time I wake my mac. I use the 3.5mm jack for my speakers and, and have since day 1.

I Think I've solved my freezing problem on my Mac mini. I use to use a hdmi to hdmi ccable with external speakers. As soon as I took out the external speaker jack the sleep/wake freezing stopped. So I've bought a dvi-d cable and used it with the supplied apple hdmi to Dvi-d aadapter plugged back in my speakers and problem has disappeared. Over the 2 times I've rebooted and let the mini sleep no problems so far.

Hope this his helps some of you