Public bug reported:

I have a dual monitor setup. Sometimes, when I log back in from the lock screen 
(I mean the session is already running), one of the screens does something 
quite strange. When I try maximise a window, it only uses a small part of the 
screen's width, as you can see here https://ibb.co/epueGd
I also can't drag the right border of a window to make it bigger. The left 
border works fine. The only solution I've found is to go to system settings-> 
displays, disable on of the monitors, and then enabling it again. Logging out 
and back in, doesn't help.
I suppose it is an xorg related bug, sorry if it's not.

information:

1) Description: Ubuntu 16.04.4 LTS
Release:        16.04

2) xorg:
  Installed: 1:7.7+13ubuntu3
  Candidate: 1:7.7+13ubuntu3
  Version table:
 *** 1:7.7+13ubuntu3 500
        500 http://ar.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status

3) Expected: window is maximised normally.

4) What happens: It only uses a portion of the width.

PS:
Here's the screenshot again, in case the other one fails.
https://photos.app.goo.gl/sdh37ktA8nCAHAum6

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-45.50~16.04.1-generic 4.13.16
Uname: Linux 4.13.0-45-generic x86_64
NonfreeKernelModules: wl
.tmp.unity_support_test.0:

ApportVersion: 2.20.1-0ubuntu2.18
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
Date: Thu Jul  5 13:16:07 2018
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0102] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo 2nd Generation Core Processor Family Integrated Graphics 
Controller [17aa:307b]
InstallationDate: Installed on 2018-05-18 (48 days ago)
InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 (20180228)
MachineType: LENOVO 1782A2Y
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-45-generic 
root=UUID=5cac15b6-1f9d-412c-ab2c-2f9318328d66 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/23/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 9PKT26AUS
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: To be filled by O.E.M.
dmi.board.vendor: LENOVO
dmi.board.version: 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:bvnLENOVO:bvr9PKT26AUS:bd08/23/2011:svnLENOVO:pn1782A2Y:pvrThinkCentreM71z:rvnLENOVO:rnTobefilledbyO.E.M.:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To be filled by O.E.M.
dmi.product.name: 1782A2Y
dmi.product.version: ThinkCentre M71z
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.3+16.04.20180221-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.83-1~16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.8-0ubuntu0~16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.8-0ubuntu0~16.04.1
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Fri Jun 29 00:13:48 2018
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Power Button         KEYBOARD, id 7
 input        Integrated Camera: Integrated C KEYBOARD, id 8
 input        Lenovo Optical USB Mouse MOUSE, id 9
 input        CHICONY USB NetVista Full Width Keyboard KEYBOARD, id 10
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.19.5-0ubuntu2~16.04.1
xserver.video_driver: modeset

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


** Tags: amd64 apport-bug compiz-0.9 third-party-packages ubuntu xenial

** Attachment added: "bug.jpg"
   https://bugs.launchpad.net/bugs/1780303/+attachment/5160125/+files/bug.jpg

** Description changed:

- I have a dual monitor setup. Sometimes, when I log back in from the lock 
screen (I mean the session is already running), one of the screens does 
something quite strange. When I try maximise, it only uses a small part of the 
screen, as you can see here https://ibb.co/epueGd
- I also can't drag the right border of a window to make it bigger. The left 
border works fine. The only solution I've found is to go to system settings-> 
displays, disable on of the monitors, and then enabling it again. Logging out 
and back in, doesn't help. 
+ I have a dual monitor setup. Sometimes, when I log back in from the lock 
screen (I mean the session is already running), one of the screens does 
something quite strange. When I try maximise a window, it only uses a small 
part of the screen's width, as you can see here https://ibb.co/epueGd
+ I also can't drag the right border of a window to make it bigger. The left 
border works fine. The only solution I've found is to go to system settings-> 
displays, disable on of the monitors, and then enabling it again. Logging out 
and back in, doesn't help.
  I suppose it is an xorg related bug, sorry if it's not.
  
  information:
  
  1) Description:       Ubuntu 16.04.4 LTS
  Release:      16.04
  
  2) xorg:
-   Installed: 1:7.7+13ubuntu3
-   Candidate: 1:7.7+13ubuntu3
-   Version table:
-  *** 1:7.7+13ubuntu3 500
-         500 http://ar.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
-         100 /var/lib/dpkg/status
+   Installed: 1:7.7+13ubuntu3
+   Candidate: 1:7.7+13ubuntu3
+   Version table:
+  *** 1:7.7+13ubuntu3 500
+         500 http://ar.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
+         100 /var/lib/dpkg/status
  
  3) Expected: window is maximised normally.
  
  4) What happens: It only uses a portion of the width.
- 
  
  PS:
  Here's the screenshot again, in case the other one fails.
  https://photos.app.goo.gl/sdh37ktA8nCAHAum6
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.13.0-45.50~16.04.1-generic 4.13.16
  Uname: Linux 4.13.0-45-generic x86_64
  NonfreeKernelModules: wl
  .tmp.unity_support_test.0:
-  
+ 
  ApportVersion: 2.20.1-0ubuntu2.18
  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
  Date: Thu Jul  5 13:16:07 2018
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes
  GraphicsCard:
-  Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0102] (rev 09) (prog-if 00 [VGA controller])
-    Subsystem: Lenovo 2nd Generation Core Processor Family Integrated Graphics 
Controller [17aa:307b]
+  Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0102] (rev 09) (prog-if 00 [VGA controller])
+    Subsystem: Lenovo 2nd Generation Core Processor Family Integrated Graphics 
Controller [17aa:307b]
  InstallationDate: Installed on 2018-05-18 (48 days ago)
  InstallationMedia: Ubuntu 16.04.4 LTS "Xenial Xerus" - Release amd64 
(20180228)
  MachineType: LENOVO 1782A2Y
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-45-generic 
root=UUID=5cac15b6-1f9d-412c-ab2c-2f9318328d66 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/23/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 9PKT26AUS
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: To be filled by O.E.M.
  dmi.board.vendor: LENOVO
  dmi.board.version: 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:bvnLENOVO:bvr9PKT26AUS:bd08/23/2011:svnLENOVO:pn1782A2Y:pvrThinkCentreM71z:rvnLENOVO:rnTobefilledbyO.E.M.:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: To be filled by O.E.M.
  dmi.product.name: 1782A2Y
  dmi.product.version: ThinkCentre M71z
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12.3+16.04.20180221-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.83-1~16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.8-0ubuntu0~16.04.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.8-0ubuntu0~16.04.1
  version.xserver-xorg-core: xserver-xorg-core N/A
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Fri Jun 29 00:13:48 2018
  xserver.configfile: default
  xserver.devices:
-  input        Power Button         KEYBOARD, id 6
-  input        Power Button         KEYBOARD, id 7
-  input        Integrated Camera: Integrated C KEYBOARD, id 8
-  input        Lenovo Optical USB Mouse MOUSE, id 9
-  input        CHICONY USB NetVista Full Width Keyboard KEYBOARD, id 10
+  input        Power Button         KEYBOARD, id 6
+  input        Power Button         KEYBOARD, id 7
+  input        Integrated Camera: Integrated C KEYBOARD, id 8
+  input        Lenovo Optical USB Mouse MOUSE, id 9
+  input        CHICONY USB NetVista Full Width Keyboard KEYBOARD, id 10
  xserver.errors:
-  
+ 
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.19.5-0ubuntu2~16.04.1
  xserver.video_driver: modeset

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1780303

Title:
  can't maximise in one monitor

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