VirtualBox

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Ticket Resolution Summary Owner Reporter
#15965 obsolete AC97 audio delays under stress Paul17041993
Description

When the VM is stressed in some way, commonly via running a game, the audio ends up with a major delay (~1000-2000ms) and mild choppy-ness. Unknown if this affects the HD and SB16 audio devices as both are non-functional for the used guests.

Tested to occur with windows xp (32b) and 2k guests, the 2k guest also cannot use audio acceleration at all as it results in a lack of audio on many formats. Host is windows 10 x64, consistent with different audio devices and Hyper-V enforced.

#5332 duplicate AC97 audio doesn't work on Windows 7 64bit guest -> duplicate of #2785 t35t0r
Description

AC97 audio doesn't work on Windows 7 Pro (Final) 64bit guest on OSX 10.5.8 host under VirtualBox 3.0.10 . I tried with and without the guest additions and I also tried SoundBlaster 16 with and without the guest additions. Neither worked.

#15598 fixed AC97 volume control is not linear [5.1 regression] Mihai Hanor
Description

I have discussed the issue here

The guest volume control is off, when using the AC97 audio controller. I would expect a linear control, but that's not the case. I consider it to be a regression in 5.1, as I have never had this kind of problems with previous versions, 5.0.xx and older. It manifests on my Windows 10 x64 host and on my Ubuntu 16.04 x64 host (running on the same PC).

As an example, on my Ubuntu host, using VirtualBox 5.1 (release) to run Ubuntu 16.04 x64 (live) as a guest. The host's Master volume control is set to 100%. Using amixer from the guest's terminal to change the guest Master volume control (e.g. amixer sset 'Master' 100%), there is no difference in sound intensity when modifying the guest's Master volume control anywhere in the range 71-100%, including the limits of this range (which seems to set the maximum intensity). Only when setting to 70%, I can hear a drop in sound intensity. On the other hand, any value below 58%, it's almost mute (I almost can hear something at 58% Master volume setting, but I have good hearing). At 59%, the sound can definitely be heard, at a very low intensity. The same is with Windows as host, the difference is an offset, meaning that, at 50% guest volume setting (using the same guest), I definitely can hear something at a very low intensity. Also, I haven't identified any differences when changing the Host Audio driver (from PulseAudio to ALSA), when using the Ubuntu host.

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