MBP M1 + CalDigit + LG Ultrafine 5K won't wake

[rickeames]

This started for me today. My MBP (11.1) running through a CalDigit T3+ to an LG 5K. I come back from leaving the computer for a bit and wake it up. It "wakes up" but the LG never displays anything. It starts to show light, and the laptop, if I open it, believes the monitor to be there, but no image is ever drawn. I have to restart to get it back. Happened a few times today and I can't figure out why as it worked fine before.

 

[joevt]

BigSur has issues. Disconnect and reconnect didn't work?

 

[rickeames]

BigSur has issues. Disconnect and reconnect didn't work?

Sadly, no - only a reboot made things better. Will wait and see if the next update to bigsur addresses....

 

[xszuflax]

This started for me today. My MBP (11.1) running through a CalDigit T3+ to an LG 5K. I come back from leaving the computer for a bit and wake it up. It "wakes up" but the LG never displays anything. It starts to show light, and the laptop, if I open it, believes the monitor to be there, but no image is ever drawn. I have to restart to get it back. Happened a few times today and I can't figure out why as it worked fine before.

I think you are facing less severe version of what I described in https://forums.macrumors.com/thread...-and-lg-34wk95u-sleep-wake-up-issues.2276874/