5K iMac issue with external monitors - High Sierra

[suffy67]

Hello

Since I have upgraded to 10.13.1 - High Sierra after my iMac returns from sleep I may lose 1 or both of my external monitors.

I have been running my 3 screen set-up for years and not had any problems until this upgrade. The only way to get both external monitors working is to reboot the system.

Does anyone else have this issue or have you found a work around?

Regards

 

[suffy67]

Just been away from my machine for 2 hours, all 3 screens are back this time..... Strange

 

[stooovie]

Connected how? My display connected via Thunderbolt daisy-chained from my Lacie RAID works but the lacie itself doesn't reconnect after waking up. Fine on Sierra.

 

[suffy67]

I also connect both external displays via Thunderbolt daisy-chained from 2 x LaCie Thunderbolt hard drives ( 1 x 3TB & 1 x 6TB)

I wonder if my real issue is the hard drives not re-connecting after sleep.

I will have to have a look next time the problem happens, since posting this it has been fine.

Thanks for your input

 

[suffy67]

I have just returned to my iMac and both Thunderbolt drives are mounted and working with no issues.

But I have lost one of my screens.