I tested it. I used the same KVM, but different computer and with 14.04
daily build (without upgrades) there was not problem although the
problem has been arounf for last few Ubuntu releases.

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https://bugs.launchpad.net/bugs/1095419

Title:
  When using KVM switch, display reverts to low resolution

Status in “xorg-server” package in Ubuntu:
  Incomplete

Bug description:
  When I have my screen resolution set to 1920 x 1080 (16:9), and I use
  my KVM switch to change to my laptop, if I am 'away' for more than
  about 10 minutes, when I click back to my Ubuntu workstation, the
  display is set to some very low, barely recognizable, resolution.  As
  a work-around, I can click on System Settings and then click on
  Displays, and the screen immediate flickers and then resets back to
  1920 x 1080, without the need for me to do anything else.  This is
  most annoying, and it was not seen in previous versions of Ubuntu.

  All I would like is the ability to lock the screen resolution so it
  doesn't change on me automatically when I am using my KVM and am
  'away' for extended periods.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: xorg 1:7.7+1ubuntu4
  ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
  Uname: Linux 3.5.0-21-generic i686
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86 Kernel Module  304.43  Sun Aug 19 20:20:21 PDT 
2012
   GCC version:  gcc version 4.7.2 (Ubuntu/Linaro 4.7.2-2ubuntu1)
  .tmp.unity.support.test.0:

  ApportVersion: 2.6.1-0ubuntu9
  Architecture: i386
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  Date: Wed Jan  2 15:09:42 2013
  DistUpgraded: Fresh install
  DistroCodename: quantal
  DistroVariant: ubuntu
  DkmsStatus:
   nvidia-current, 304.43, 3.5.0-21-generic, i686: installed
   virtualbox, 4.1.18, 3.5.0-21-generic, i686: installed
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   NVIDIA Corporation GT218 [GeForce 8400 GS] [10de:10c3] (rev a2) (prog-if 00 
[VGA controller])
     Subsystem: eVga.com. Corp. Device [3842:1302]
  InstallationDate: Installed on 2013-01-01 (0 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.2)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  MarkForUpload: True
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-21-generic 
root=UUID=d4fbded6-3d00-4c42-8662-4471dfdd93e9 ro quiet splash
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/10/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.40
  dmi.board.asset.tag: BC5FF4594FFA
  dmi.board.name: 970DE3/U3S3
  dmi.board.vendor: ASRock
  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.:bvrP1.40:bd07/10/2012:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rn970DE3/U3S3:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.
  version.compiz: compiz 1:0.9.8.6-0ubuntu1
  version.libdrm2: libdrm2 2.4.39-0ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.0-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.0-0ubuntu1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu6.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.99.99~git20120913.8637f772-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.9-0ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.2-0ubuntu3

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