Ventura 13.4 External Display Sleep Loop Bug

App & System Services Hardware
CEOpx OP
Created May ’23
Replies 34
Boosts 6
Views 6.6k
Participants 26

The Ventura 13.4 update introduced a display signal lost bug which when the monitor is put to sleep after power saving setting is reached or if manually using the shortcut keys to put sleep the display, it wakes up the monitor briefly then tries to go back to sleep for 15 seconds and then wakes up with the “no signal” warning in an infinite loop. It's starting to be reported by others, where this did not exist until after the update.

Reddit: Ventura 13.4 Display Sleep Issue https://www.reddit.com/r/MacOS/comments/13lyu2y/macos_ventura_134_display_sleep_issue/

I tried everything from turning off power saving settings, turned off screen saver, WoL, uninstalled color calibration software, reset monitor to factory settings, booted into safe mood, nothing had an effect.

Should I submit a bug report?

Replies  34
Boosts  6
Views  6.6k
Participants  26
brandonyap OP
Oct ’23

Can also confirm that the bug is still there in Sonoma. I note quite a few people having this problem with DisplayPort connections but i'm using HDMI and it's happening to me too. Dell S2419H connected via HDMI through a Satechi multiport adapter via USB-C.

0
Rvvv OP
Oct ’23

This is really not acceptable. Apple please fix this issue. It was introduced in Ventura 13.4 and remains unfixed since. FIXIT.

0
Cappielockie OP
Oct ’23

The same problem: On connecting with LG display (LG-27UL850W), the display connection can't be established.

We have about 20 MacBooks and MacBook Airs (various ages) running OSX, and about 32 LG monitors.

Both Ventura and Sonoma installs experience the same behaviour.

Things we tried, without success:

  • Turning it off and on again (both computer and display)
  • Switch USB-C cables with a working monitor.
  • Use other USB-C port on the computer.
  • Add additional power adapter to the computer.
  • Upgraded from Ventura to Sonoma.

I've seen an error in Console.app on attempting to connect to a display that fails to connect.

kernel (AppleDisplayCrossbar)
Subsystem: -- Category: <Missing Description> Hide
Activity ID: 0 
Thread ID: 0×357d19 
PID: 0
Volatile ERROR

2023-10-05 09:31:15.490449+0200

IOAV[165125] AppleATCDPAltModePort(atc0-dpphy)<0x1000002b8>::handleActivate: DP Alt Mode with PHY still in use

Maybe needless to say, but this greatly disrupts our work.

1
JiveTurkey OP
Oct ’23

Sonoma 14.1 fixed this issue for me.

1
MarcoGiaco OP
Oct ’23

Just updated to Sonoma 14.1 and the bug it has been fixed for me. I have a LG 27UD68

1
yapyj OP
Oct ’23

Display sleep restored on 27UD58 with 14.1 (23B74)

Thank you Apple.

0
usachan OP
Dec ’23

LG-27UL550 still has the problem... with 14.1

0
wangchou OP
Mar ’24

The bug is only partially fixed on LG -27UK600. (macOS 14.1 ~ 14.3.1) The external monitor still wake up randomly in night...

sleep -> several hours bug free -> [display on -> display off -> display on -> display off] -> several hours bug free.

The display on/off loop count are decreased from infinite to several times. I was waked up by it today, and I feel so bad.

0
PinoBlanc OP
Mar ’24

Finally! The External Display Sleep Loop Bug was fixed in my setup too.

Environment: Mac mini (2023, M2) macOS Sonoma 14.4

Primary Monitor: Iiyama PL3270Q Display (HDMI) Secondary Monitor: Iiyama PL3270Q Display (USB-Display Port)

Good Job!

0
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