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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
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unity-settings-daemon randr support has problems in virtual machines
Status in unity-settings-daemon package in Ubuntu:
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-
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
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)
UpgradeStatus: No upgrade log present (probably fresh install)
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