grub2 stuck

[bgb]

Hi,



I installed ArchLinux on my intel NUC11, there is already an windows before 
that. 

the problem is:
after I shutdown the machine,

if screen is in sleep mode, next boot will hang at grub menu. there is nothing 
I can do except force shutdown with power botton.
if screen is NOT in sleep mode, which means I do next boot immediately after 
shutdown or do next boot immediately after I manually power down and power up 
screen. next boot behaves normal.


above problem disappears if I use another machine, e.g. macbook


do you have any idea on this problem?  thanks.


best regards.