After updating to kernel 4.9 I ended up with a blank screen after grub.
Booted back to 4.8 and checked logs and found a firmware file was showing as erroring and load not loading:
So I had to add that to firmware load files in the generic device drivers of the kernel and now all works.
It had a firmware file
before so the k one is new in 4.9.
I have a Pi 3 that is a DNS, web, email etc server and it's gone through a few SD cards and gets bogged down in high wait % in top somet...
This is something that caught my interest a few years ago and has been sitting in the garage churning out tiny fractions of a bitcoin regula...
This one might save someone some searching :-) I can't remember when it started happening but the UserEventAgent process started using...
We still see this one occasionally. Had one case where we needed to get a policy on but couldn't reboot the firewall. So, tried a few ...