VirtualBox

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Ticket Resolution Summary Owner Reporter
#6107 obsolete Choppy sound malai5
Description

I am getting choppy sound in Linux guests on VBox with Vista Ultimate 32 Bit host. I have tried all the usual fixes but nothing works.

#6108 obsolete infinite resolution switching loop - WinXP Guest on WinXP x64 or Ubuntu 9.10 AMD64 Host uboot
Description

I faced this bug with VirtualBox 2.x and it is still there with 3.x. I'm running a WinXP Pro Guest under both - WinXP x64 and Ubuntu 9.10 AMD64.

Certain applications like Internet Explorer (e.g. when opening an xps document) and FritzBox USB-over-LAN (.NET application) put VirtualBox into some endless resolution switching loop - it permanently switches the screen resolution of the Guest, causing screen flickering and window resizing and it is very hard to get control over the virtual machine.

Enabling/Disabling 2D/3D acceleration, Automatic Window Resize, Seamless or Fullscreen mode does not help.

Guest Tools are up to date.

The only thing that ends this killing the application inside the Guest OS via Alt-F4.

#6110 obsolete Guest OS with more than 3GB RAM locks up if more than 3GB written out to guest HDD MikeP
Description
  • Host machine: AMD Phenom 9650 Quad-Core Processor /w 8GB RAM
  • Host OS: Debian Lenny
  • Guest OS: Guest OS: Debian Lenny, 1CPU, 3.5GB RAM, 10GB HDD, IDE controller
  • running in 32-bit for host and guest

I have found if I have more than 3GB of RAM allocated to the Guest OS and execute a program which writes out more than 2.8GB of data to the guest hard drive, the guest machine locks up. Found first when trying bonnie++ for I/O benchmark testing. Able to repeat using dd if=/dev/zero of=testfile bs=1048576 count=3000.

What I see happening is as the large datafile is being written out on the guest machine, on the host, top reports the RES value for VBoxHeadless increases until it reaches 3.0g. Once RES reaches this value, the guest machine stops responding.

Nothing is written out to the vbox.log file. Attached is a screen shot with top running on the host (green text) and top running on the guest (white text) after the guest stops responding.

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