I've just noticed there is a new release of QEMU (have no idea whether this will help resolve the problem though)http://www.phoronix.com/scan.php?page=news_item&px=OTExNw"QEMU 0.14 Improves Linux Virtualizatio
While it was not long ago that QEMU 0.13 was released, QEMU version 0.14 is now available with more improvements to this open-source processor emulator.
New in QEMU 0.14 is an emulation layer for the Intel ICH-9 AHCI controller, USB support for remote wake-ups, preparations for USB 2.0 support in QEMU, improved PCI Express support, new Intel HD Audio support, updated block drivers, new support for the SPICE protocol, support for the QXL device as a para-virtual graphics card, and improvements to QMP.
The full list of 0.14 changes can be found on the Wiki change-log. The latest version can also be downloaded at QEMU.org. Also expect to see QEMU-KVM 0.14 to be released very soon