Virtual Box 5.1.4 发布，开源虚拟机

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                　　Virtual Box 5.1.4 发布了。更新日志：

• 　　GUI: show actual VM uptime in the session information window
  
• 　　Audio: re-enabled speakers for Mac OS X guests (5.1.0 regression; bug #15611)
  
• 　　Audio: fixed crashes under certain conditions
  
• 　　USB: fixed a hang under certain conditions
  
• 　　USB: fixed a hanging guest under certain conditions (bug #15747)
  
• 　　PIIX4: implemented dummy SMBus controller to prevent annoying Linux kernel warnings about uninitialized SMBus base address (bug #9517)
  
• 　　NVMe: several fixes to improve stability, fixed a crash while saving a VM state
  
• 
  　　VMDK: Fixed an issue creating fixed>
  
• 　　VHDX: fixed cloning images with VBoxManage clonehd (bug #14288)
  
• 　　Storage: Fixed broken bandwidth limitation when the limit is very low (bug #14982)
  
• 　　EFI: fixed sending debug messages in the EFI firmware if a serial port is enabled (bug #12161)
  
• 　　OVF: when importing appliances, make sure that the version of the embedded VirtualBox-specific settings is processed, to get the default settings handling right
  
• 　　VBoxManage: Don't try to set the medium type if there is no change (bug #13850)
  
• 　　Linux installer: fixed some scripting issues (bugs #15701 and #15702)
  
• 　　Linux installer: fixed a path issue on certain Linux distributions (bug #15717)
  
• 　　Windows hosts: fixed corrupted mouse pointers with some Linux and Solaris guests (bug #15665)
  
• 
  　　Linux Additions: made the video driver work on 32-bit guests with large video memory>
  
• 　　Linux Additions: made the video driver work on kernel 4.7 and later (bug #15769)
  
• 　　Linux Additions: converted a failure message to an informational one when drivers could not be stopped during upgrade (bug #15692)
  
• 　　Linux Additions: made the video driver work around an X server bug which cause screen refresh to stop (bug #15511)
  
• 　　Windows Additions: auto-resizing fixes for Windows 10 guests (bug #15257)
  
• 　　Windows Additions: fixed VBoxTray problems with Windows 2000 (bug #15661)
  

　　详情：https://www.virtualbox.org/wiki/Changelog#v4