Public bug reported:

I just dist-upgraded my Zesty machine and two things broke related to
sleeping the displays.  I have a 34" wide panel on the left and a 20"
high resolution Dell on the right.

Everything works fine until the displays sleep, say after a lockscreen
has started.  First, the right screen never wakes from sleep; even
though the lights on the front are green (indicating an active display),
once the right display has slept, it never wakes back up even after a
login.

Second, and probably related: all the windows that were on the right
display are now shifted over to the left and full-screened.

This has all worked for a long time, but something in the recent stable
updates has broken this, so it's a pretty serious regression.  Nothing
short of a reboot returns the dual screens to full functionality.

ProblemType: Bug
DistroRelease: Ubuntu 17.04
Package: xorg 1:7.7+16ubuntu3
ProcVersionSignature: Ubuntu 4.10.0-21.23-generic 4.10.11
Uname: Linux 4.10.0-21-generic x86_64
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair nvidia_uvm nvidia_drm 
nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  375.66  Mon May  1 15:29:16 
PDT 2017
 GCC version:  gcc version 6.3.0 20170406 (Ubuntu 6.3.0-12ubuntu2)
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.4-0ubuntu4.1
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity:Unity7
Date: Fri Jun  2 00:17:33 2017
DistUpgraded: Fresh install
DistroCodename: zesty
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.8, 4.10.0-20-generic, x86_64: installed
 bbswitch, 0.8, 4.10.0-21-generic, x86_64: installed
 nvidia-375, 375.66, 4.10.0-21-generic, x86_64: installed
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes
GraphicsCard:
 NVIDIA Corporation GK104 [GeForce GTX 760] [10de:1187] (rev a1) (prog-if 00 
[VGA controller])
   Subsystem: Gigabyte Technology Co., Ltd GK104 [GeForce GTX 760] [1458:360b]
InstallationDate: Installed on 2016-01-22 (497 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160117)
MachineType: Gigabyte Technology Co., Ltd. Z170X-UD5
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-21-generic 
root=UUID=d03718f1-9983-4b07-a942-1b42fe8352ec ro
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/24/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: F2
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: Z170X-UD5-CF
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF2:bd07/24/2015:svnGigabyteTechnologyCo.,Ltd.:pnZ170X-UD5:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnZ170X-UD5-CF:rvrx.x:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: Z170X-UD5
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.13.1+17.04.20170109-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.76-1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.0.3-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 17.0.3-1ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.19.3-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.9.0-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20170309-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.14-0ubuntu1
xserver.bootTime: Thu Jun  1 23:54:29 2017
xserver.configfile: default
xserver.errors: open /dev/fb0: No such file or directory
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.19.3-1ubuntu1

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 ubuntu uec-images zesty

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https://bugs.launchpad.net/bugs/1695141

Title:
  Recent update broke multiheaded sleep

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