I have had a sleep bug since the stable update on the 22nd August. My system gets stuck and resumes when trying to sleep sometimes. It means i often closed the lid of my computer and find its still running when i get up in the morning.
I need to use some of the kernel diagnostics but i have not been able to figure how, or get the advice on how to do it.
Im using this site Best practice to debug Linux* suspend/hibernate issues
It says to add kernel options like initcall_debug &/or ignore_loglevel to the kernel boot options.
I have added one of these options to /etc/sysctl.d/99-sysctl.conf but i dont think it works, I can see an error in the logs after reboot that says.
06/09/2020 00:59 systemd Failed to start Apply Kernel Variables.
How/where do i add these kernel options?
How do i test that they are working after i add them somewhere?