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[Bug 1543619] Re: unity-settings-daemon randr support has problems in virtual machines


A couple of references.  These affect various hypervisors and some
physical hardware.


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  unity-settings-daemon randr support has problems in virtual machines

Status in unity-settings-daemon package in Ubuntu:

Bug description:
  I am not sure to what extent this should be treated as a bug, perhaps
  best to start with some discussion.

  When a user sets a resolution in Unity Control Centre, that resolution
  is remembered (in a file called $HOME/.config/monitors.xml) and unity-
  settings-daemon always tries to set that resolution on that monitor.
  In general this is a good idea, but unity-settings-daemon uses EDID
  data to distinguish monitors.  This breaks in virtual machines (tested
  in VirtualBox, but I believe this affects other hypervisors too) which
  simulate monitor hot-plug to get guest systems to adjust to the size
  of the window on the host in which the virtual machine is being
  displayed.  The hypervisors generally do not provide EDID data, and
  u-s-d does not realise that these are different monitors.  So either
  the monitor is kept to a standard resolution or u-s-d flashes up a
  message, "Could not apply the stored configuration for monitors", to
  complain if the resolution selected no longer exists.

  The simplest solution might be not to remember the resolution if no
  EDID data is available.

  See also https://answers.launchpad.net/unity-settings-

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: unity-settings-daemon 15.04.1+15.10.20151029-0ubuntu1
  ProcVersionSignature: Ubuntu 4.2.0-27.32-generic 4.2.8-ckt1
  Uname: Linux 4.2.0-27-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Feb  9 15:23:59 2016
  InstallationDate: Installed on 2015-11-16 (85 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  SourcePackage: unity-settings-daemon
  UpgradeStatus: No upgrade log present (probably fresh install)

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