One of the strangest bugs I've ever seen
TL;DR: Tablet plugged in but not charging running RR nougat. ?!?
I recently bought a manufacturer refurbished v521 (might actually have been new overstock). It replaced a v521 I had used happily for over a year until the battery started to crap out. The first tablet was always rooted with TWRP running LG stock marshmallow or nougat. So I am very familiar with the device.
After struggling to get Resurrection on the new tablet (black screens, TWRP bootloops, etc.) I finally had everything working. Or so I thought.
Whenever I plugged the tablet into a charger, be it the bundled LG oem charger or various Samsung, Aukey, Tronsmart, etc. chargers, Ampere gave me plugged in but not charging. Wiggling the cable made no difference. Sometimes after a restart the tablet would charge again. But any time I plugged the tablet in again, I got the same weird report.
The odd thing was that the tablet would charge off a USB cable connected to a pc and MTP worked as expected. So that lead me to believe that the issue was with software since the port seemed to work for everything but charging. But in all my years of working with Android ROMs, I had never seen anything like this
I didn't think I could live with only charging the device when it was connected to the pc, so I began the laborious task of returning it to stock marshmallow so I could exchange it. Once I got it back on stock LG 6.0.1 it charged normally and now it is on 7.0 and charges normally.
So either RR has a weird bug or it is in Lineage and carried over. Be that as it may I will stick with LG stock since there aren't a lot of custom ROMs for this device. I'm glad I didn't cry wolf with the reseller before I reverted to stock.
Odd that no one else has reported this here.