After upgrading the kernel to 4.4.x series, it takes my laptop a long
time to shut down without intervention.
Sometimes I see a status saying something like "wait job is running for
user ... (1m 30sec)"
But a lot of the time I just see the bootup log with "Starting Switch
Root..." being the last line
I noticed one way to shut down is to use sysrq shortcuts (R,E,I from
REISUB combo) -- obviously that's not a perfect solution..
Laptop has dual graphics, if that makes any difference.. Intel+Nvidia
Not sure if filing a bug would even help, most of them just get ignored
for years