Ever since upgrading my Macmini8,1 to OS v12 or 12.3, the display will sometimes not wake the next morning when I try to use it. When in this state, nothing I try gets me a working display and I am forced to power cycle. ((This is especially frustrating because of all the publicity about this issue supposedly being "Mac M1 only".))
What I tried:
- Power cycling display
- SSH into mac mini, proving it is awake...
- Switching HDMI1 and HDMI2 cables on the monitor, serving as an "unplug video" and proving my Raspberry Pi can display on either HDMI port.
- In System Prefs I disabled ALL power management
- ...because Power Management is off everywhere, at night before bed I must power off the display.
- I've firmly pressed power button (1 second), waited a few seconds, then pushed it again (1 second)
- Yesterday I tried booting into Recovery, and did a full network OS reinstall. Problem happened again this morning...
In the morning, it is 50-50 chance whether display wakes. (I have not tried not leaving the monitor on overnight... it gives off too much light even when the display is blacked)
While problem is happening, Terminal says:
$ pmset -g
System-wide power settings:
Currently in use:
standby 1
Sleep On Power Button 1
womp 1
autorestart 1
hibernatefile /var/vm/sleepimage
proximitywake 1
powernap 1
gpuswitch 2
networkoversleep 0
disksleep 0
standbydelayhigh 86400
sleep 0
hibernatemode 3
ttyskeepawake 1
displaysleep 0
tcpkeepalive 1
highstandbythreshold 50
standbydelaylow 86400
$ sysctl -n hw.model
Macmini8,1
$ sw_vers
ProductName: macOS
ProductVersion: 12.3.1
BuildVersion: 21E258
Monitor is an LG 27BK85U and it has all sleep and low-power settings disabled. It will turn off if it does not get a signal, but swapping HDMI cables can serve to nudge it awake (a brighter black), but the LG thinks it does not have a signal from the Mac so it goes full dark in a few seconds.
