Ok, I was able to fix this on my Dell Inspiron 3551. The solution was a
superclean fresh installation of ubuntu16.04 with the latest bios
installed and secure boot off. Everything (suspend/wake/restart) works
now with the latest ubuntu default kernel (XX-34). But don't aks me why
or what went wrong
Same here on Dell Inspiron 3351 using ubuntu 16.04.1 with the latest
kernel (currently 4.4.0-34). System won't wake up after suspend and the
screen remains dark. Restart and shutdown won't finish and hang on the
shutdown screen. I have to switch it off manually.
The installation of the latest bios
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