Well, hilariously, I just fixed my speakers today!
Tryied everything, uninstall, install, and then install w/o uninstall.
Did it several times.
No fix.
To my confusion, every time that I run a test on headphones, I got the sound in speakers if I was running some audio (like a Youtube) at the time.
So I always thought THIS IS FROM SOFTWARE.
An then I saw this Louis Armstrong fix, applyed and voila! There is sound!
Marvelous, hilarious and useful!
ProBook 6540B, 3.5 y old, the audio jack is used pretty much - maybe not on a daily basis, but every other day.