This issue did not appear after an update/upgrade - I recall having it also with 14.04 LTS where I ended up never suspending the laptop (never reported a bug myself before, though). Now my usage profile has changed and suspend/resume is important.
To the upstream question - unfortunately this issue is not fixed by the mainline kernel 4.8.0-040800rc3-generic. Added the kernel-bug-exists-upstream tag.
This issue did not appear after an update/upgrade - I recall having it also with 14.04 LTS where I ended up never suspending the laptop (never reported a bug myself before, though). Now my usage profile has changed and suspend/resume is important.
To the upstream question - unfortunately this issue is not fixed by the mainline kernel 4.8.0-040800rc3 -generic. Added the kernel- bug-exists- upstream tag.