Just updated 16.04 and seeing this behavior.

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https://bugs.launchpad.net/bugs/1689356

Title:
  UI scale being reset to 1 everytime when display sleeps for a while

Status in compiz package in Ubuntu:
  Confirmed
Status in unity package in Ubuntu:
  Confirmed
Status in unity-settings-daemon package in Ubuntu:
  Confirmed

Bug description:
  After upgrading to Ubuntu 17.04,
  the HiDPI setting(Scale for menu and title bars)
  is being reset to 1 everytime when display sleeps for a while,
  making everything looks small.

  If the display sleeps and I resume it instantly, it's fine,
  but if the display slept for long, the HiDPI setting gets reset to 1.

  My guess is that if a display is plugged in(detected), the old DPI
  setting is not restored.

  This issue is not present on previous Ubuntu versions
  and the same issue persists even after a fresh install.

  *---------------------------------*
  This bug is now present also in 16.04 since a recent update, experiencing 
this in Xenial since 23 Feb 2018 at least. We could trace the cause of the bug 
in the recent backports/bugfix updates to Xenial.
  *---------------------------------*

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: xorg 1:7.7+16ubuntu3
  Uname: Linux 4.10.14-zen+ x86_64
  NonfreeKernelModules: 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)
  .proc.driver.nvidia.warnings.fbdev:
   Your system is not currently configured to drive a VGA console
   on the primary VGA device. The NVIDIA Linux graphics driver
   requires the use of a text-mode VGA console. Use of other console
   drivers including, but not limited to, vesafb, may result in
   corruption and stability problems, and is not supported.
  .tmp.unity_support_test.0:

  ApportVersion: 2.20.4-0ubuntu4
  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: Tue May  9 02:08:25 2017
  DistUpgraded: Fresh install
  DistroCodename: zesty
  DistroVariant: ubuntu
  DkmsStatus: nvidia, 375.66, 4.10.14-zen+, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   NVIDIA Corporation GP104 [GeForce GTX 1080] [10de:1b80] (rev a1) (prog-if 00 
[VGA controller])
     Subsystem: ASUSTeK Computer Inc. GP104 [GeForce GTX 1080] [1043:85aa]
   Advanced Micro Devices, Inc. [AMD/ATI] Bonaire XTX [Radeon R7 260X/360] 
[1002:6658] (prog-if 00 [VGA controller])
     Subsystem: Gigabyte Technology Co., Ltd Bonaire XTX [Radeon R7 260X/360] 
[1458:227b]
  InstallationDate: Installed on 2017-05-06 (1 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  MachineType: ASUS All Series
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.10.14-zen+ 
root=UUID=e1130f0b-d82f-4976-989f-c8b18f0965eb ro intel_iommu=on 
vfio_iommu_type1.allow_unsafe_interrupts=1
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/18/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 3402
  dmi.board.asset.tag: Default string
  dmi.board.name: X99-A
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr3402:bd08/18/2016:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnX99-A:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.name: All Series
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS
  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 N/A
  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: Tue May  9 00:26:57 2017
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:

  xserver.version: 2:1.19.3-1ubuntu1

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