I just got a used MacBook Pro, 2017 without the Touchbar. It has 2 USB-C Ports on the side. I'm not using mobile much, but I do sometimes. At my desk I'm using a USB-C device that gives me an HDMI, USB-A, and USB-C port for charging.
I've noticed that while everything is plugged in and the laptop is on everything seems to work fine. However, if the laptop is asleep the system stops charging. It only seems to charge asleep when the charger is directly connected to the computer. I've reset the SMC twice and the NVRAM and this is a fresh copy of macOS installed via Internet Recovery.
Is this normal behavior?
I'm concerned because I bought the laptop used from a computer shop and I have a limited window to bring it back to them if it is faulty. I just don't know if this is normal or not.
I'm assuming that macOS requires to be running for it to recognize the splitter device. I've got an external hard disk attached to a powered USB hub which is then attached to the laptop via this splitter device. When the computer wakes from sleep I get an error saying I should unmount the device before powering off the drive. I never got this error with previous Mac's that had their own USB-A ports.
In addition to the USB hub and charger, I also have an external monitor connected via the HDMI port, so all 3 are going through this one splitter device. I don't know if that is relevant, but I thought I'd include it in case it is. Everything seems to work perfectly when the system is on.
I really like the idea of when I want to do work with the larger monitor and such I can just plug one thing in, so I would really appreciate help on seeing if I can get it working in this configuration / if this is NOT normal (i.e. there is some potential hardware failure) returning it to the store I bought it from in short order.