I have a HP ProBook 6440b running Windows 7. The in built speakers work fine, but when I plug in headphones it does not seem to recognise these and continues to output sound via the in built speakers.
I have included a screenshot that shows sound output on the laptop
I'm guessing that I am missing a driver for the earphone jack, but unsure. Any ideas on this would be great as it is a real hassle not being able to use my earphones.