Ventura 13.4 External Display Slee… | Apple Developer Forums

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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?

6.1k

Posted by

CEOpx

Reply

+1 for me. LG 27UD58 really annoying having to press buttons on my monitor to turn off.

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

—
Rvvv

Replies

Doing more research, I found this in my log file when putting the display to sleep, getting repeated errors.

error 18:03:48.968770-0500 com.apple.AmbientDisplayAgent [ERROR] - Unable to create and lookup port "com.apple.CoreDisplay.master" => 1102

0  	       0x18d79fb58	CoreDisplay::Mach::Port::Port(std::__1::basic_string&lt;char, std::__1::char_traits&lt;char>, std::__1::allocator&lt;char>>, CoreDisplay::Mach::Port::PortLookup) + 392
1  	       0x18d75ff5c	CoreDisplay_Display_SetAutoBrightnessIsEnabled + 168
2  	       0x104012a44	setCompensationState + 60
3  	       0x104013ff4	main + 4852
4  	       0x18b91fe74	_xpc_connection_call_event_handler + 152
5  	       0x18b91e8f4	_xpc_connection_mach_event + 1376
6  	       0x18ba2c4c0	_dispatch_client_callout4 + 20
7  	       0x18ba48ed8	_dispatch_mach_msg_invoke + 468
8  	       0x18ba33960	_dispatch_lane_serial_drain + 372
9  	       0x18ba49c24	_dispatch_mach_invoke + 448
10 	       0x18ba3f244	_dispatch_workloop_worker_thread + 648
11 	       0x18bbd8074	_pthread_wqthread + 288
12 	       0x18bbd6d94	start_wqthread + 8

Posted by

CEOpx

I killed com.apple.AmbientDisplayAgent process, but the bug is still existed.

—
wangchou

Hi, I'm the author of the Reddit post, Found the same error log on my Mac Studio.

Posted by

MarcoGiaco

Update: Tried to update to Ventura 13.5 Public Beta, the issue is still present.

Posted by

MarcoGiaco

Not much more to say besides (a) exact same problem, (b) I see the same console errors, and (c) it's infuriating, as my monitor keeps waking constantly, I have to put my Mac fully to sleep to prevent a blinding light from flashing every 15 seconds at night.

Posted by

geerlingguy

Same issue here. MacBook Pro 16 M1 Max. Please fix it.

[ERROR] - Unable to create and lookup port "com.apple.CoreDisplay.master" => 1102	
	0  	       0x191e5bb58	CoreDisplay::Mach::Port::Port(std::__1::basic_string&lt;char, std::__1::char_traits&lt;char>, std::__1::allocator&lt;char>>, CoreDisplay::Mach::Port::PortLookup) + 392
	1  	       0x191e18f88	CoreDisplay_IsCustomWhitePointSet + 100
	2  	       0x1a8879c38	getCustomWhitePointXYZ + 120
	3  	       0x1a887a19c	modifyAndSetIntentionForWhitePoint + 68
	4  	       0x1a887a380	modifyAndSetIntentionForWhitePointOnEveryDevice + 172
	5  	       0x194f882d4	CGSPostLocalNotification + 188
	6  	       0x194f87eb0	(anonymous namespace)::notify_datagram_handler(unsigned int, CGSDatagramType, void*, unsigned long, void*) + 116
	7  	       0x194f86eb0	CGSSnarfAndDispatchDatagrams + 1108
	8  	       0x1952c455c	SLSGetNextEventRecordInternal + 344
	9  	       0x1950bd1ac	SLEventCreateNextEvent + 16
	10 	       0x10404b7e8	main + 2792
	11 	       0x1900e8400	_dispatch_client_callout + 20
	12 	       0x1900f797c	_dispatch_lane_barrier_sync_invoke_and_complete + 56
	13 	       0x10404b6f4	main + 2548
	14 	       0x1903a6254	__CFMachPortPerform + 248
	15 	       0x190376bcc	__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 60
	16 	       0x190376aec	__CFRunLoopDoSource1 + 520
	17 	       0x1903754cc	__CFRunLoopRun + 2240
	18 	       0x1903744b8	CFRunLoopRunSpecific + 612
	19 	       0x1903f957c	CFRunLoopRun + 64
	20 	       0x10404b4a4	main + 1956
	21 	       0x190297fa8	_pthread_start + 148
	22 	       0x190292da0	thread_start + 8

Posted by

Rvvv

Took me some days to recognize that it was the 13.4 update that did let my LG 32UN880 sleep. Same problem here as described in this thread.

The only way to avoid the LG 32UN880 to really sleep is to manually put the MacBook to sleep from apple menu.

Posted by

stooky

I am having the same problem. It effects the LG but not the Cinema Display. Both are connected by DP. Manual sleep does not help.

Posted by

Humuku

I'm also experiencing this bug after updating to macOS 13.4, but it only occurs on one of the 2 external displays attached to my Mac Studio.

The display connected to the built-in HDMI port doesn't seem to experience this, but the other display (same make/model) connected via a third-party USB-C to DisplayPort adapter does.

Posted by

eddiekelley

I have the same bug with my LG monitor.

Posted by

JiveTurkey

Same Issue Two External NEC 4k's. Upon wake after forced sleep connection is lost to the externals, sometimes.

Posted by

Device222

I contacted apple support and apple developer support and filed a case, so at least apple should be area of it.

Posted by

stooky

You'd think all Apple's in-house developers using multiple DisplayPort displays would consider this a priority…

—
macsolv

Updating to 13.4.1 did nothing to address this bug. I'd have to imagine that Apple Developers are experiencing this themselves.

Posted by

CEOpx

Update: Apple responded to the feedback I submitted on "Feedback Assistant" with "Works as currently designed."

I can't find the words to describe this garbage. It's a shame.

Posted by

MarcoGiaco

I have the same problem. I primarily use an LG 32UN880 on my Mac Studio M1 MAX, and a Dell 2515H as a second monitor. About a week ago I replaced the Dell with an LG 32UN880P and promptly encountered this problem. The 32UN880 always goes to sleep, the 32UN880P does not. The problem occurs via DisplayPort to USB-C cable, but via USB-C. The 32UN880P also has a MacBook Pro 13" M1 connected to it via USB-C, in addition to the Mac Studio, and the monitor does not go into standby here either. The screen is black, but the backlight stays on. It only helps to send the Mac into standby, as it has already been described by others here. I upgraded the Mac Studio to macOS Sonoma for testing, again the problem still exists.

Could someone tell which log you are viewing? Thanks!

Posted by

oklhost

Ventura 13.5 - bug still exist - LG 27UP850

Posted by

Udaw