VirtualBox 4.2 Beta 1 released

Pre-VirtualBox 5 forum

VirtualBox 4.2 Beta 1 released

Postby Frank Mehnert » 3. Aug 2012, 16:33

Please do NOT use this VirtualBox Beta release on production machines. A VirtualBox Beta release should be considered a bleeding-edge release meant for early evaluation and testing purposes.

You can download the binaries here.

Please do NOT open bug reports at but use our VirtualBox Beta Feedback forum to report any problems with the Beta. Please concentrate on reporting regressions since VirtualBox 4.1.18.

VirtualBox 4.2 will be a new major release. The following major new features were added:
  • Improved Windows 8 support, in particular many 3D-related fixes
  • GUI: VM groups (bug #288)
  • GUI: expert mode for wizards
  • GUI: allow to alter some settings during runtime
  • Support for up to 36 network cards, in combination with an ICH9 chipset configuration (bug #8805)
  • Resource control: added support for limiting network IO bandwidth; see the manual for more information
  • Added possibility to start VMs during system boot on Linux, OS X and Solaris; see the manual for more information (bug #950)
  • Added experimental support for Drag'n'drop from the host to Linux guests. Support for more guests and for guest-to-host is planned. (bug #81)
In addition, the following items were fixed and/or added:
  • VMM: improved VM context switch performance for Intel CPUs using nested paging
  • VMM: added support for FlushByASID features of AMD CPUs (Bulldozer and newer)
  • VMM: fixed unreal mode handling on older CPUs with VT-x (gPXE, Solaris 7/8/9; bug #9941)
  • VMM: fixed MP tables fixes for I/O APIC interrupt routing relevant for ancient SMP guests (e.g. old OS/2 releases)
  • VMM: support recent VIA CPUs (bug #10005)
  • GUI: network operations manager
  • GUI: allow taking screenshots of the current VM window content
  • GUI: allow automatically sorting of the VM list
  • GUI: allow starting of headless VMs from the GUI
  • GUI: allow reset, shutdown and poweroff from the Manager window
  • GUI: allow to globally limit the maximum screen resolution for guests
  • GUI: show the full medium part on hovering the list of recently used ISO images
  • GUI: do not create additional folders when a new machine has a separator character in its name (bug #6541)
  • GUI: don't crash on terminate if the settings dialog is still open (bug #9973)
  • Snapshots: fixed a crash when restoring an old snapshot when powering off a VM (bug #10491)
  • Settings: sanitise the name of VM folders and settings file (bug #10549)
  • Settings: allow to store the iSCSI initiator secret encrypted
  • E1000: 802.1q VLAN support
  • Storage: implemented burning of audio CDs in passthrough mode
  • Storage: implemented support for discarding unused image blocks through TRIM for SATA and IDE and UNMAP for SCSI when using VDI images
  • Storage: added support for QED images
  • Storage: added support for QCOW (full support for v1 and readonly support for v2 images)
  • Storage: added readonly support for VHDX images
  • Solaris additions: added support for Server 1.11 and 1.12
  • Windows hosts: no need to recreate host-only adapters after a VirtualBox update
  • Windows hosts: updated toolchain; make the source code compatible to VC 2010 and enable some security-related compiler options
This list is not complete. This is a first beta and the code still needs some polishing and not all new features are documented yet. Although we already did a lot of testing and don't expect critical regressions, please backup your data before trying this Beta.
Frank Mehnert
Oracle Corporation
Posts: 2980
Joined: 7. Jun 2007, 09:11
Location: Dresden, Germany
Primary OS: Debian Sid
VBox Version: PUEL
Guest OSses: Linux, Windows

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