I have been having the same issue with thunderbolt. I'm surprised ASUS has not answered this simple question in over a week...
Hi all, I have the Hero Z590 running Windows 11 with BIOS 1301. I use the Thunderbolt USB C E1 port in the back panel to charge my phone. While my comp is on it works great, while its off it doesn't give a charge...I am sure its a mobo setting but don't know where. It used to work but I think when I updated BIOS it turned off. Any ideas?
This is probably by design. Does the manual say it will still charge in standby?
When in standby or shut-down, then your power supply is also turned off. Only a 5 volt standby power supply is supplied to the motherboard, this is officially only there to allow the power button to work, power up the Intel ME chip for remote management, and if set to suspend to memory, then some current is used keeping the memory refreshed. Most power supplies only supply 2 or 3 amps of this standby power, with a lot of that powering the bits explained above, leaving little left over to supply the required 5 volt @ 3 amp that the Thunderboard USB-C charger is required to supply, therefore it can't work when the PC is off.