to avoid the driver rename master playback volume to master surround,
you need to specify
ac97->spec.ad18xx.lo_as_master = 1;
only for the enumerated ad1980 codec inside virtualbox
static int patch_ad1888(struct snd_ac97 * ac97)
{
unsigned short misc;
patch_ad1881(ac97);
ac97->build_ops = &patch_ad1888_build_ops;
/*
* LO can be used as a real line-out on some devices,
* and we need to revert the front/surround mixer switches
*/
if (ac97->subsystem_vendor == 0x1043 &&
ac97->subsystem_device == 0x1193) /* ASUS A9T laptop */
ac97->spec.ad18xx.lo_as_master = 1;
misc = snd_ac97_read(ac97, AC97_AD_MISC);
/* AD-compatible mode */
/* Stereo mutes enabled */
misc |= AC97_AD198X_MSPLT | AC97_AD198X_AC97NC;
if (!ac97->spec.ad18xx.lo_as_master)
/* Switch FRONT/SURROUND LINE-OUT/HP-OUT default connection */
/* it seems that most vendors connect line-out connector to
* headphone out of AC'97
*/
misc |= AC97_AD198X_LOSEL | AC97_AD198X_HPSEL;
snd_ac97_write_cache(ac97, AC97_AD_MISC, misc);
ac97->flags |= AC97_STEREO_MUTES;
return 0;
}
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https://bugs.launchpad.net/bugs/1487168
Title:
[Emulated AD1980 AC97 inside Virualbox 5.0, playback] volume slider
problem
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