> I would also guess that it is not likely that Virtual Box is the direct cause because the list of work distros runs on the same Virtualbox platform that serves the failing distros.
NO, the change of enumerated ac97 codec from stac9200 to ad1980 in virtualbox is the main cause of the problem unfortuately enable log by dev_ac97 still not sufficient to produce useful debug info you need to recompile alsa driver by adding those dev_info to dump the values of ac97 codec registers read/write the worst thing is the ad1980 in dell imension 8400 did not work in the above bug report, it is not clear how headphone and line out use/share volume control -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1487168 Title: [Emulated AD1980 AC97 inside Virualbox 5.0, playback] volume slider problem To manage notifications about this bug go to: https://bugs.launchpad.net/virtualbox/+bug/1487168/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
