BUG: External Monitors Don't Sleep While In ClamShell Mode
 

Background:

While in clamshell mode (Lid closed, power plugged in) and connected to a Dell D3100 DisplayLink dock the external monitors do not acknowledge any sleep commands. However if not in clamshell mode (Laptop Monitor is opened) the internal and external monitors observe the sleep command

Reproduced on:

• 2018 15" MacBook Pro (Intel)
• MacOS 12.1
• DisplayLink Driver 1.6
• Dell D3100 Dock
• 3 HP E223 External Monitors

Steps To Reproduce Bug While In ClamShell Mode:

1. Put MacBook into Clamshell mode (Lid closed, power plugged in) and connect to DisplayLink Dock connected to multiple external monitors.
   
2. Run Terminal and issue the command "pmset displaysleepnow"
   
   Observe no external monitors sleeping.

Steps To Validate Functionality Working As Expected While Not Clamshell Mode:

1. Take MacBook out of Clamshell mode by lifting lid so Internal Display is also on
   
2. Run Terminal and issue the command "pmset displaysleepnow"
   
   Observe all monitors (Internal and External) going to sleep.

FYI. Upgraded to Mac OS 12.2 tonight and the bug persists.

FYI Bug still exists with Monterey 12.3 and DisplayLink 1.6.1 :(

Bug still persistent in Monterey 12.4 with latest DisplayLink driver 1.7.1 :(

I’ve been experiencing this exact issue. MacOS Monterey, Dell D3100 docking station. Monitors simply do not go to sleep like they do when plugged directly into the MacBook. Doesn’t go to sleep when the MacBook is left idle for the configured sleep time, nor with the pmset command OP mentioned. The only way I’ve found to get the monitors to sleep is to manually lock the machine (Control + cmd + Q) and then Escape.

Not an issue when plugged into a Windows machine.

Are there any plans to look into this?

had to register just for this as it's getting pretty annoying

macbook air m1

ventura 13.0.1 and latest displaylink and I have the same issue

closing the lid the two displaylink external monitors turn off for a minute then they come back on

Can also confirm same issue exists still on Ventura 13.2, latest displaylink driver on an Intel Mac too.

Does the information in this knowledge base article help? --> https://support.displaylink.com/know...eep-on-display

Unfortunately not. I have the option to Powersave all monitors while in clamshell disabled.

Adding to this thread - mine don't sleep either, although this bothers me less than them not waking up. I posted a thread here.

I see from the posts here that this issue is agnostic to types of monitors, docks, and OS versions. Everything was working as expected up until a few months ago, when I upgraded the DisplayLink software, but the version I was using prior was installed in 2023.

Has anyone been able to contact support and get some kind of explanation of why this bug has not been fixed in checks date 3 years?