UltraFine 4K bluescreen when restarting or shutting down

[huschpuscheli]

hello,

i've experienced a weird thing with my ultrafine 4k (3.10,3.4,... firmware) which is connected to a tbMBP running high sierra: when i shutdown the computer or restart it, the ultrafine gives me a greenish bluescreen. i've made a video to illustrate it:

what do you think?

thank you for your help.

 

[bcaslis]

I've seen the same thing with High Sierra though it did not do this with Sierra. My guess is that it's just a graphics artifact with the changes in High Sierra.

 

[Fishrrman]

Does the monitor run ok otherwise?
Is this ONLY when you shut down, and ONLY for a second?
Does it always "come back up" when you reboot?
No problems awaking from sleep?

If so, I wouldn't worry more that 2 seconds over it.
There are far worse things in this world to be worryin' over...

 

[huschpuscheli]

Does the monitor run ok otherwise?

yes, even though i'm noticing random white distortions across the screen (like a white bar) for a split of a second since the high sierra update which i cannot reproduce.

Is this ONLY when you shut down, and ONLY for a second?

yes, before shut down or restart.

Does it always "come back up" when you reboot?

yes.

No problems awaking from sleep?

no problems here.

 

[bcaslis]

FYI, I've also seen the green screen sometimes when restarting the MBP and it's not attached to the LG monitor. So I'm pretty convinced it's just a High Sierra "feature".