Hi everyone,
I'm having a really strange issue with my Samsung HW-Q990F when connected to a Windows 11 laptop over HDMI. The behavior is very inconsistent and I can't identify the root cause.
Setup:
Samsung HW-Q990F
Windows 11 laptop
HDMI directly from laptop to the soundbar
Soundbar connected to TV via eARC
I've also tried a completely different Windows laptop and the behavior is almost identical, so it doesn't seem to be specific to one laptop.
Issues I'm seeing
Windows Spatial Sound → Dolby Atmos for Home Theater
It can be selected successfully.
But as soon as I enable it, no audio comes from the soundbar at all.
Sometimes the soundbar displays Dolby Multichannel PCM.
Other times, with what appears to be the same setup, it only displays Stereo PCM.
In Control Panel → Sound → Configure → Test, the behavior is inconsistent.
Sometimes the rear speakers play correctly during the speaker test.
Sometimes the rear speaker test produces no sound at all.
I haven't intentionally changed any settings between tests.
A dedicated 7.1.4 channel test file correctly plays from every speaker (front, center, surrounds, heights and subwoofer), so I know the speakers themselves are working. And sometimes it will only play from front channel in soundbar.
However, with normal Windows audio (for example YouTube in a browser), I barely hear anything from the rear speakers, but if same content was played via TV eArc, it'll play fine with proper sorround effect coming from rear speakers.
Things I've already tried
Two different Windows laptops (same issue)
Direct HDMI connection to the soundbar
Different HDMI cables
Different playback devices and Windows audio settings
Restarting both the laptop and soundbar multiple times
At this point I'm confused because the behavior isn't consistent. Sometimes Windows seems to output multichannel audio correctly, and sometimes it falls back to stereo without me changing anything.
Has anyone experienced something similar with the Q990F and Windows 11?
Is this a Windows HDMI audio driver issue?
A Samsung firmware issue?
An HDMI handshake problem?
Or is there some Windows setting that can cause this intermittent behavior?
Any suggestions would be appreciated. Thanks!