Sound Output changes from headphones to HDMI after waking from sleep

My late 2013 Retina MBP has had this issue since I purchased it last year, but I'm hoping there's a solution.
When I'm working at my desk, I have an external monitor connected via HDMI (and a 2nd via Thunderbolt). The Monitor connected via HDMI has (crappy) speakers. Even though I have headphones plugged in, when I wake the machine from sleep, the audio device will revert to HDMI.
Any ideas how to prevent this?
Thanks

Others here are also suffering from similar problems after the last update.
see > loss of sound after waking up from sleep: Apple Support Communities
and > TS4113 Mac mini looses audio output...: Apple Support Communities
For some installing the > OS X Mountain Lion Update v10.8.5 (Combo) over the top of the current 10.8.5 version solved the problem.
It might also help to report the problem to > Apple - Mac OS X - Feedback
and/or > Apple - Mac mini - Feedback

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Here is the Everest summary report:
Field Value
Computer
Computer Type Advanced Configuration and Power Interface (ACPI) PC (Mobile)
Operating System Microsoft Windows XP Professional
OS Service Pack [ TRIAL VERSION ]
Internet Explorer 6.0.2600.0000 (IE 6.0 - Windows XP)
DirectX 4.08.01.0810 (DirectX 8.1)
Computer Name TECRA-8100 (Tecra 8100)
User Name General User
Logon Domain [ TRIAL VERSION ]
Date / Time 2009-07-15 / 14:18
Motherboard
CPU Type Mobile Intel Pentium IIIE, 500 MHz (5 x 100)
Motherboard Name TOSHIBA Portable PC
Motherboard Chipset Intel 82440BX/ZX
System Memory [ TRIAL VERSION ]
BIOS Type Toshiba (12/30/99)
Communication Port Communications Port (COM1)
Communication Port ECP Printer Port (LPT1)
Display
Video Adapter S3 Graphics Inc. SavageMX (8 MB)
Video Adapter S3 Graphics Inc. SavageMX (8 MB)
3D Accelerator S3 Savage/MX (86c270)
Monitor Generic Television
Monitor Toshiba Internal 1024x768 Panel
Multimedia
Audio Adapter Yamaha Native DS1 Audio CODEC
Storage
IDE Controller Intel(r) 82371AB/EB PCI Bus Master IDE Controller
Floppy Drive Floppy disk drive
Disk Drive IBM-DARA-212000 (11 GB, 4200 RPM, Ultra-ATA/66)
Optical Drive TOSHIBA DVD-ROM SD-C2402 (8x/24x DVD-ROM)
SMART Hard Disks Status OK
Partitions
C: (NTFS) [ TRIAL VERSION ]
Total Size [ TRIAL VERSION ]
Input
Keyboard Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
Mouse HID-compliant mouse
Mouse PS/2 Compatible Mouse
Network
Primary IP Address [ TRIAL VERSION ]
Primary MAC Address 00-10-A4-E1-F9-30
Network Adapter Xircom CardBus Ethernet II 10/100
Modem TOSHIBA Internal V.90 Modem
Peripherals
Printer Epson ActionLaser 1100
Printer HP DeskJet 540
Infrared Controller Infrared Port
USB1 Controller Intel 82371AB/EB PIIX4 - USB Host Controller
USB Device USB Human Interface Device
Battery Microsoft AC Adapter
Battery Microsoft ACPI-Compliant Control Method Battery
Battery Microsoft ACPI-Compliant Control Method Battery
DMI
DMI BIOS Vendor TOSHIBA
DMI BIOS Version Version 2.30
DMI System Manufacturer TOSHIBA
DMI System Product Portable PC
DMI System Version Version 1.0
DMI System Serial Number [ TRIAL VERSION ]
DMI Motherboard Manufacturer TOSHIBA
DMI Motherboard Product Portable PC
DMI Motherboard Version Version A0
DMI Motherboard Serial Number [ TRIAL VERSION ]
DMI Chassis Manufacturer TOSHIBA
DMI Chassis Version Version 1.0
DMI Chassis Serial Number [ TRIAL VERSION ]
DMI Chassis Asset Tag [ TRIAL VERSION ]
DMI Chassis Type Notebook
DMI Total / Free Memory Sockets 2 / 0

Hello
Thats a good questions and I never heard about such an issue...
I think at fist you should start to update the sound driver of your notebook. Therefore you can look on the Toshiba website for an update:
http://eu.computers.toshiba-europe.com => Support & Downloads => Download Drivers
Before you install the newest version, you should remove the old version first and restart the notebook.
Maybe a reinstallation of Windows with the Toshiba recovery disk could be also useful and in worst case its a hardware malfunction and you have to exchange the mainboard. :(
Greets

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Sound Output changes from headphones to HDMI after waking from sleep

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