HP laptop ... Windows 7. I used to be able to plug my laptop to the TV using HDMI and hear the audio through the TV speakers. Suddenly one day the audio stopped working, video still works fine. I'm not aware of any other change that happened around the same time. No new software. Windows Updates are happening all the time.
I can hear audio through the laptop speakers.
I tried a different laptop, same HDMI cable. Audio works fine through the TV speakers using that laptop.
What's the difference between the two laptops? Control Panel --> Sound --> Playback tab. The system that works has three devices including "AMD HDMI Output". The system that doesn't work only has one device - Headphones.
Both machines are receiving Windows Updates automatically.
How did this machine lose its "HDMI Output" device? and how can we fix it?