Mac mini 2018: No display on wake some of the time

Question

Mac mini 2018: No display on wake some of the time

I've got a Mac mini 2018 hooked up via USB-C to a LG MU88W, which works great 95% of the time.

However, maybe 1 in 20 wake ups from system sleep initiate a monitor wake up (i.e. the monitor gets a signal from the Mac mini telling it to come out of the monitor's sleep mode), but no image is ever displayed. The Mac mini has actually turned on (it even accepts keyboard input! I can restart it with a command if needed) but simply is not connecting to the display.

I've restarted the display, unplugged and replugged the USB-C connection, etc. The only fix I've found so far is restarting the Mac mini.

What can I do to fix or diagnose this?

Mac mini 2018 or later

Posted on Jan 3, 2019 9:52 AM

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Answer 1

hcsitas

Level 6

13,964 points

Jan 3, 2019 11:03 AM in response to Nick O'Neill1

For starters I would

check firmware for updates
turn auto-standby off
turn smart energy off

If no improvement then

connect to HDMI (will likely work flawlessly)

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Answer 2

padams35

Level 4

3,613 points

Jan 3, 2019 11:24 AM in response to Nick O'Neill1

Same/similar issue, different display, worse wake from sleep failure rate, but easier recovery (on my setup cycling monitor power works.) My issue is present on both direct HDMI connection and indirect eGPU connections.

The only persistent 'fix' I've found is to go to Energy Preferences and select 'Prevent computer from sleeping automatically when display is off.' After all if computer never has to wake up you never after to worry about wake from sleep issues.

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Answer 3

Jan 3, 2019 11:50 AM in response to padams35

Thanks for the info @padams35, I'll keep looking around for a solution as preventing sleep isn't a reasonable solution in my case.

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Mac mini 2018: No display on wake some of the time

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