Comment 1 for bug 1624961

Can you also confirm this with an Ubuntu based v4.8-rc6 kernel (currently available in yakkety-proposed)

https://launchpad.net/ubuntu/+source/linux/4.8.0-11.12

Based on the bug description, it appears this is a regression which originates from upstream and was introduced in 4.8-rc2:

linux$ git describe --contains 5958d19a143eb229e9ece20bd4c781ad41cb7d24
v4.8-rc2~20^2~9

Upstream is now at v4.8-rc7. If the issue remains, please report this upstream as well.