*** This bug is a duplicate of bug 1566302 ***
https://bugs.launchpad.net/bugs/1566302
Same issue with a HP Pavillion dv6.
Kernel 4.4.21 and 4.4.22 power management didn't work on suspend and general
power management behaviour was weird and buggy (disk shutdown but didn't wake
up and black screen after suspend timeout).
Solved by now with a kernel upgrade to 4.6.0. Everything seems to work
now. Excelent power management on batteries.
Refer:
http://ubuntuhandbook.org/index.php/2016/05/install-linux-
kernel-4-6-ubuntu-16-04/
Thanks
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https://bugs.launchpad.net/bugs/1574125
Title:
suspend not working after upgrade
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