For the past 2 weeks, ever since I've updated my kernel to
3.16.0-48-generic, my suspend option in the
xfce4-session-logout popup fails to work most of the times. The screen switches off, but the computer does not suspend. I can see the power light glowing as it would on while normally running my computer.
On the other hand, running
pm-suspend as root works without any issues. What could be problem here? My machine is a Dell Latitude 3440 laptop with bumblebee and nVidia drivers installed & running.