= Changelog for VirtualBox 5.1 =

This page lists all changes of the !VirtualBox 5.1 '''[wiki:Download_Old_Builds_5_1 releases]'''.[[BR]]
All branches: [wiki:Changelog 5.1] · [wiki:Changelog-5.0 5.0] · [wiki:Changelog-4.3 4.3] · [wiki:Changelog-4.2 4.2] · [wiki:Changelog-4.1 4.1] · [wiki:Changelog-4.0 4.0] · [wiki:Changelog-3.2 3.2] · [wiki:Changelog-3.1 3.1] · [wiki:Changelog-3.0 3.0] · [wiki:Changelog-2.2 2.2] · [wiki:Changelog-2.1 2.1] · [wiki:Changelog-2.0 2.0] · [wiki:Changelog-1.6 1.6]

For 5.0.26 changes, please go [wiki:Changelog-5.0 here].

[=#v0]
'''!VirtualBox 5.1''' (released 2016-07-12)[[BR]][[BR]]
This is a major update. The following major new features were added:
 * VMM: new APIC and I/O APIC implementations that result in significantly improved performance in certain situations (for example with networking, bug #15295)
 * VMM: added support for Hyper-V paravirtualized debugging of Windows guests
 * VMM: emulate even more MMIO and shadow pagetable exits without going back to user mode
 * GUI: overall migration to Qt5 (bug #11775)
 * GUI: passive API event listener improving the VM GUI performance and response time
 * Audio: added HDA (High Definition Audio) support for newer Linux guests
 * Audio: added on-demand timers which should improve the overall performance and reduce the CPU consumption
 * Audio: more fine-grained volume control for the AC'97 emulation, which now also takes the master volume control into account
 * better support for Python 3
In addition, the following items were fixed and/or added:
 * VMM: activate the x2APIC by default for Linux guests
 * VMM: many more fixes
 * GUI: the ''Detach UI'' action is now a part of the VM Machine menu
 * GUI: reworked session information window
 * GUI: the new VM wizard now allows to choose the VM location for the VM which is being created
 * GUI: fixed location of touch events in unscaled HiDPI mode (bugs #14366, #14367)
 * GUI: various bugfixes and internal cleanup
 * Storage: use ''fallocate()'' or similar if present to speed up creating fixed-sized disk images (bug #5967)
 * Storage: implemented NVMHCI-compatible storage controller
 * Audio: various bugfixes and infrastructure improvements
 * E1000: implemented interrupt throttling for performance improvements
 * EFI: many improvements, for example allow to boot from USB
 * OVF: improved handling of signed manifests
 * API: Windows XP guests and Windows 2003 server guests now default to the E1000 T Server network card
 * VBoxSVC: fixed several memory leaks when handling .dmg images
 * Installers: ship VBoxBugReport
 * Windows hosts: reworked COM proxy (e.g. bug #8298)
 * Linux installers: no longer rely on DKMS for module rebuilding
 * Linux Additions: fix a problem when updating the initramfs after the guest modules are compiled (bug #15579)
 * Linux Additions: try to fix a problem where the OpenGL libraries where loaded by the X server when we only support X clients (bug #15574)