bắc phan, I thank you for your comment.
you can use that, i even use 45W powerbank to charge my notebook pro gtx,…
I believe so. Nonetheless when connected 60W on Windows 10 the pop-up showed up with the 90W figure displayed. Then in the battery status there was the note of non charging. But after couple of minutes it started charging. The system was practically idle, no games, no heavy soft opened then.
In ubuntu 18.04.2 no issues with charging with 60W at all.