** Description changed:

  After upgrading to Ubuntu Gnome 16.04 LTS, the screen power saver started to 
malfunction.
  When the desktop is idle, it turn off the screen as usual, but a second later 
it turns the screen back on.
  This happens repeatedly.
  I have disconnected any input device as well.
  
  I'm using Ubuntu gnome 16.04 with kernel version: 4.4.0-21-generic
  x86_64
  
  This is the syslog entries from the moment the power-saver mode was
  started:
  
- Apr 25 11:25:58 Funaro-Home kernel: [211250.250189] 
[drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo 
underrun on pch transcoder A
- Apr 25 11:26:05 Funaro-Home /usr/lib/gdm3/gdm-x-session[1167]: (II) intel(0): 
resizing framebuffer to 1680x1050
- Apr 25 11:26:05 Funaro-Home /usr/lib/gdm3/gdm-x-session[1167]: (II) intel(0): 
switch to mode [email protected] on VGA1 using pipe 0, position (0, 0), rotation 
normal, reflection none
- Apr 25 11:26:05 Funaro-Home gnome-session[1180]: Gjs-Message: JS LOG: Device 
->
- Apr 25 11:26:05 Funaro-Home dbus[696]: [system] Activating via systemd: 
service name='org.freedesktop.hostname1' 
unit='dbus-org.freedesktop.hostname1.service'
- Apr 25 11:26:05 Funaro-Home systemd[1]: Starting Hostname Service...
- Apr 25 11:26:05 Funaro-Home kernel: [211257.746217] gnome-shell[20730]: 
segfault at 33684 ip 00007f80010fd7e5 sp 00007ffe6707deb8 error 4 in 
libgobject-2.0.so.0.4800.0[7f80010c9000+52000]
- Apr 25 11:26:05 Funaro-Home dbus[696]: [system] Successfully activated 
service 'org.freedesktop.hostname1'
- Apr 25 11:26:05 Funaro-Home systemd[1]: Started Hostname Service.
- Apr 25 11:26:05 Funaro-Home gnome-session[1180]: gnome-session-binary[1180]: 
WARNING: Application 'gnome-shell.desktop' killed by signal 11
- Apr 25 11:26:05 Funaro-Home gnome-session-binary[1180]: WARNING: Application 
'gnome-shell.desktop' killed by signal 11
- Apr 25 11:26:05 Funaro-Home gnome-session[1180]: 
(gnome-settings-daemon:1329): GnomeDesktop-WARNING **: Error setting property 
'PowerSaveMode' on interface org.gnome.Mutter.DisplayConfig: 
GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name :1.435 was not 
provided by any .service files (g-dbus-error-quark, 2)
- Apr 25 11:26:05 Funaro-Home /usr/lib/gdm3/gdm-x-session[1167]: (II) intel(0): 
resizing framebuffer to 3600x1080
- Apr 25 11:26:05 Funaro-Home /usr/lib/gdm3/gdm-x-session[1167]: (II) intel(0): 
switch to mode [email protected] on HDMI2 using pipe 0, position (0, 0), rotation 
normal, reflection none
- Apr 25 11:26:05 Funaro-Home /usr/lib/gdm3/gdm-x-session[1167]: (II) intel(0): 
switch to mode [email protected] on VGA1 using pipe 1, position (1920, 30), 
rotation normal, reflection none
- Apr 25 11:26:05 Funaro-Home kernel: [211258.006231] 
[drm:intel_set_cpu_fifo_underrun_reporting [i915]] *ERROR* uncleared fifo 
underrun on pipe B
- Apr 25 11:26:05 Funaro-Home kernel: [211258.006246] 
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO 
underrun
- Apr 25 11:26:06 Funaro-Home gnome-session[1180]: current session already has 
an ibus-daemon.
- Apr 25 11:26:06 Funaro-Home dbus[696]: [system] Activating via systemd: 
service name='org.freedesktop.GeoClue2' unit='geoclue.service'
- Apr 25 11:26:06 Funaro-Home systemd[1]: Starting Location Lookup Service...
- Apr 25 11:26:06 Funaro-Home dbus[696]: [system] Successfully activated 
service 'org.freedesktop.GeoClue2'
- Apr 25 11:26:06 Funaro-Home systemd[1]: Started Location Lookup Service.
- Apr 25 11:26:06 Funaro-Home dbus[696]: [system] Activating service 
name='org.freedesktop.PackageKit' (using servicehelper)
- Apr 25 11:26:06 Funaro-Home gnome-session[1180]: Gjs-Message: JS LOG: No 
permission to trigger offline updates: Polkit.Error: 
GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: Action 
org.freedesktop.packagekit.trigger-offline-update is not registered
- Apr 25 11:26:06 Funaro-Home gnome-session[1180]: Gjs-Message: JS WARNING: 
[/home/liran/.local/share/gnome-shell/extensions/[email protected]/net_speed_status_icon.js
 156]: assignment to undeclared variable device
- Apr 25 11:26:06 Funaro-Home gnome-session[1180]: Gjs-Message: JS LOG: Device 
->
- Apr 25 11:26:06 Funaro-Home AptDaemon: INFO: Initializing daemon
- Apr 25 11:26:06 Funaro-Home org.freedesktop.PackageKit[696]: 11:26:06 
AptDaemon [INFO]: Initializing daemon
- Apr 25 11:26:06 Funaro-Home AptDaemon.PackageKit: INFO: Initializing 
PackageKit compat layer
- Apr 25 11:26:06 Funaro-Home org.freedesktop.PackageKit[696]: 
/usr/lib/python3/dist-packages/aptdaemon/worker/pkworker.py:35: PyGIWarning: 
PackageKitGlib was imported without specifying a version first. Use 
gi.require_version('PackageKitGlib', '1.0') before import to ensure that the 
right version gets loaded.
- Apr 25 11:26:06 Funaro-Home org.freedesktop.PackageKit[696]:   from 
gi.repository import PackageKitGlib as pk
- Apr 25 11:26:06 Funaro-Home org.freedesktop.PackageKit[696]: 11:26:06 
AptDaemon.PackageKit [INFO]: Initializing PackageKit compat layer
- Apr 25 11:26:06 Funaro-Home dbus[696]: [system] Successfully activated 
service 'org.freedesktop.PackageKit'
- Apr 25 11:26:06 Funaro-Home gnome-session[1180]: Gjs-Message: JS LOG: [FREON] 
Render all MenuItems
- Apr 25 11:26:07 Funaro-Home gnome-shell[30007]: GNOME Shell started at Mon 
Apr 25 2016 11:26:06 GMT+0300 (IDT)
+ Apr 27 16:09:31 Funaro-Home /usr/lib/gdm3/gdm-x-session[1152]: (II) intel(0): 
resizing framebuffer to 1680x1050
+ Apr 27 16:09:31 Funaro-Home /usr/lib/gdm3/gdm-x-session[1152]: (II) intel(0): 
switch to mode [email protected] on VGA1 using pipe 0, position (0, 0), rotation 
normal, reflection none
+ Apr 27 16:09:31 Funaro-Home /usr/lib/gdm3/gdm-x-session[1152]: (II) intel(0): 
resizing framebuffer to 3600x1080
+ Apr 27 16:09:31 Funaro-Home /usr/lib/gdm3/gdm-x-session[1152]: (II) intel(0): 
switch to mode [email protected] on HDMI2 using pipe 0, position (0, 0), rotation 
normal, reflection none
+ Apr 27 16:09:31 Funaro-Home /usr/lib/gdm3/gdm-x-session[1152]: (II) intel(0): 
switch to mode [email protected] on VGA1 using pipe 1, position (1920, 30), 
rotation normal, reflection none
+ Apr 27 16:09:32 Funaro-Home gnome-session[1165]: (gnome-shell:1390): 
GLib-GObject-WARNING **: 
/build/glib2.0-t9oPgV/glib2.0-2.48.0/./gobject/gsignal.c:2635: instance 
'0x2e02040' has no handler with id '71399'
+ Apr 27 16:09:32 Funaro-Home gnome-session[1165]: (gnome-shell:1390): 
GLib-GObject-WARNING **: 
/build/glib2.0-t9oPgV/glib2.0-2.48.0/./gobject/gsignal.c:2635: instance 
'0x2e02040' has no handler with id '71399'
+ Apr 27 16:09:36 Funaro-Home gnome-session[1165]: Gjs-Message: JS LOG: Device 
->
+ Apr 27 16:09:36 Funaro-Home dbus[737]: [system] Activating via systemd: 
service name='org.freedesktop.hostname1' 
unit='dbus-org.freedesktop.hostname1.service'
+ Apr 27 16:09:36 Funaro-Home systemd[1]: Starting Hostname Service...
+ Apr 27 16:09:36 Funaro-Home dbus[737]: [system] Successfully activated 
service 'org.freedesktop.hostname1'
+ Apr 27 16:09:36 Funaro-Home systemd[1]: Started Hostname Service.
+ Apr 27 16:09:36 Funaro-Home gnome-session[1165]: Gjs-Message: JS LOG: [FREON] 
Render all MenuItems
+ 
+ Edit: kernel version 4.5 fixed the errors with intel drm (see updated
+ log above), but the problem remains the same.

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https://bugs.launchpad.net/bugs/1574511

Title:
  Screen re activated imidiatlly after idle

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