Comment 30 for bug 1849084

I don't know if this will help find the solution to this problem, but for what it's worth, here's a solution that worked in my instance & I would very much like to know why it worked.
System; Lenovo V155-15API (V155 Series)
Processor; AMD Ryzen 5 3500U
Graphics adapter; AMD Radeon RX Vega 8
Memory; 12288 MB (Windows partition)

Dual booting Windows 10 & Ubuntu 19.10 (Ubuntu being main OS on separate partition)

Problem that developed in Ubuntu, hibernate/sleep/resume (including lid close) not working correctly consistently, requiring a power off reboot.

After failing to find an answer to the problem in Linux, I eventually booted into Windows to find the problem even worse there, no hibernate/sleep/resume at all, a power off reboot the only option.

Solution (So far); I downloaded the AMD Driver Auto-detect tool & let it install the drivers it detected as needed or needing updating.

After this I rebooted into Windows & found hibernate/sleep/resume to be working perfectly.

Thinking this to be a Windows only fix, I rebooted into Ubuntu with the intention of finding drivers suitable for fixing the problem in Linux, but before doing so, found to my surprise that hibernate/sleep/resume were now working perfectly in Ubuntu as well.

Is these drivers somehow being shared via the EFI partition?