Public bug reported:

My system is unable to detect the correct resolution of the monitor.
This problem is not consistent and happens randomly. I think its a
driver issue.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-87.110-generic 4.4.73
Uname: Linux 4.4.0-87-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CompizPlugins: No value set for 
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Sat Aug  5 17:51:25 2017
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
 bbswitch, 0.8, 4.4.0-87-generic, x86_64: installed
 bbswitch, 0.8, 4.4.0-89-generic, x86_64: installed
 nvidia-375, 375.66, 4.4.0-87-generic, x86_64: installed
 nvidia-375, 375.66, 4.4.0-89-generic, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
 Intel Corporation 4th Gen Core Processor Integrated Graphics Controller 
[8086:0416] (rev 06) (prog-if 00 [VGA controller])
   Subsystem: Lenovo 4th Gen Core Processor Integrated Graphics Controller 
   Subsystem: Lenovo GK208M [GeForce GT 740M] [17aa:380a]
InstallationDate: Installed on 2015-12-21 (593 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: LENOVO 20287
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-87-generic.efi.signed 
root=UUID=b2b670cf-975c-444c-b9be-75df78fb9323 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install) 10/24/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DCN40WW
dmi.board.asset.tag: No Asset Tag VIUU4
dmi.board.vendor: LENOVO
dmi.board.version: 31900059STD
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo IdeaPad Z510
dmi:bvnLENOVO:bvr8DCN40WW:bd10/24/2014:svnLENOVO:pn20287:pvrLenovoIdeaPadZ510:rvnLENOVO:rnVIUU4:rvr31900059STD:cvnLENOVO:ct10:cvrLenovoIdeaPadZ510: 20287
dmi.product.version: Lenovo IdeaPad Z510
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.76-1~ubuntu16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.0.7-0ubuntu0.16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 17.0.7-0ubuntu0.16.04.1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Fri Aug  4 23:58:05 2017
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
 product id                                5565 
 vendor                                     CMN
xserver.version: 2:1.18.4-0ubuntu0.3

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

** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial

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  Unable to detect correct resolution of external monitor

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