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?
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Bugs, which is subscribed to kwin in Ubuntu.
https://bugs.launchpad.net/bugs/1849084
Title:
Freeze on system-resume caused by kwin and amdgpu driver
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