After minimising full screen VM, on restoring only quarter of screen shown

[Tony Middleton]

When running a VM full screen, if I minimise the VM and then restore it, the VM stays in full screen mode but only about a quarter of it is shown.

In the attached screen shot you can see a Xubuntu guest part showing top left on a Kubuntu host.

The problem occurs both with Windows and Linux guest.

The problem has only occurred since the host upgraded to Kubuntu 16.10.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: virtualbox 5.1.30-dfsg-1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
CurrentDesktop: KDE
Date: Fri Nov 10 15:01:53 2017
InstallationDate: Installed on 2015-06-12 (882 days ago)
InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
ProcEnviron:
 LANGUAGE=en_GB
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: virtualbox
UpgradeStatus: Upgraded to artful on 2017-10-31 (9 days ago)

[Gianfranco Costamagna (costamagnagianfranco)]

please test vbox 5.2.8 or similar

[Tony Middleton (ximera)]

I've tried with 5.2.6 from your PPA and the problem is still there. Wasn't sure where to get 5.2.8 from as I'm running 17.10. Is there an Ubuntu source or should I use the Oracle site?

[Gianfranco Costamagna (costamagnagianfranco)]

Hello, please try 5.2.8 now in my ppa :)

[Tony Middleton (ximera)]

Sorry, 5.2.8 doesn't fix it.

Something I hadn't noticed before, both with the original version and 5.2.8.

If I alternately minimise/maximise/minimise/maximise/.... on the maximise it alternately fails/works.

[Gianfranco Costamagna (costamagnagianfranco)]

Can you please open an upstream bug report and link it here?

[Tony Middleton (ximera)]

Sorry, not sure what you mean by an upstream bug report. Do you mean via the Oracle website or somewhere else on Launchpad?

[Gianfranco Costamagna (costamagnagianfranco)]

yes, upstream Oracle website (right now down for maintenance)

[Tony Middleton (ximera)]

Raised upstream as https://www.virtualbox.org/ticket/17636.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Tony Middleton (ximera)]

I'm now running virtualbox 6.1.10 on Kubuntu 20.04 and the problem seems to have been fixed.