I found the thread I talked about. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1870971
the laptop the first poster has a 3500U in it according to google and a few comments mentioned it -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1887218 Title: Ryzen 5 3500U - laptop won't boot when on battery power Status in linux package in Ubuntu: Incomplete Bug description: Ryzen 5 3500U (release in 2019) won't boot when laptop is on battery power. It affects different brands of laptops. Laptop boots normally with charger in and you can unplug the charger and then use battery. For some a work around is possible on kernel 5.4. For others kernel should be 5.5 or better yet 5.6. issue described in more detail in Ubuntu forums: https://ubuntuforums.org/showthread.php?t=2446942 dmesg: https://paste.ubuntu.com/p/C2xNzpBKq5/ iommu=soft boot options provides the work arround on some laptops, while on others USB ports stop working. OS: Kubuntu 20.04 LTS CPU: Ryzen 5 3500U GPU: AMD Vega 8 RAM: 8 GB DDR4 2400 Mhz disk: 256 GB nvme I patched kernel (now tainted) to get driver for rtl8821ce (wi-fi). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1887218/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
