Blank screen after wakeup from suspend

[ethan.hsieh]

1) The release of Ubuntu you are using
lsb_release: Ubuntu 16.04 LTS release 16.04
kernel: 4.4.0-36-generic

2) The version of the package you are using
gnome-screensaver: 3.6.1-7ubuntu4
unity-settings-daemon: 15.04.1+16.04.20160701-0ubuntu1
Graphic: nvidia (driver 370.23)

3) What you expected to happen
screen is on after wakeup from suspend

4) What happened instead
screen is blank although system wakes up

5) Failure rate: 1/5

6) How to reproduce this issue:
a. [System Menu] => [Suspend]
b. press the key to wake up system
c. screen is blank although system wakes up

[ethan.hsieh (ethan.hsieh)]

Log:

(unity-settings-daemon:1845): power-plugin-DEBUG:

==> system wakes up after pressing the key

Received session is active change: now inactive
Received session is active change: now active
Doing a state transition: normal
TESTSUITE: Unblanked screen
Adding suspend delay inhibitor
Received screensaver ActiveChanged signal: 1 (old: 0)
setting up blank callback for 15s
setting up sleep callback 300s
setting up sleep warning callback 240s
Doing a state transition: blank
TESTSUITE: Blanked screen
keyboard toggle on
Received screensaver ActiveChanged signal: 1 (old: 1)
Received screensaver ActiveChanged signal: 0 (old: 1)
setting up sleep callback 300s
setting up sleep warning callback 240s
Received screensaver ActiveChanged signal: 0 (old: 0)

==> screen is blank although system wakes up
==> have to press the key again to turn on the screen

power-plugin-DEBUG: idletime reset
power-plugin-DEBUG: Doing a state transition: normal
power-plugin-DEBUG: TESTSUITE: Unblanked screen
power-plugin-DEBUG: keyboard toggle off