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[Raymond <1487168@xxxxxxxxxxxxxxxxxx>]

static void snd_intel8x0_codec_write(struct snd_ac97 *ac97,
				     unsigned short reg,
				     unsigned short val)
{
	struct intel8x0 *chip = ac97->private_data;
+   dev_info(chip->card->dev, "ac97 write %d - %.2x : %.4x\n", ac97->num, reg, val);
	if (snd_intel8x0_codec_semaphore(chip, ac97->num) < 0) {
		if (! chip->in_ac97_init)
			dev_err(chip->card->dev,
				"codec_write %d: semaphore is not ready for register 0x%x\n",
				ac97->num, reg);
	}
	iaputword(chip, reg + ac97->num * 0x80, val);
}

static unsigned short snd_intel8x0_codec_read(struct snd_ac97 *ac97,
					      unsigned short reg)
{
	struct intel8x0 *chip = ac97->private_data;
	unsigned short res;
	unsigned int tmp;

	if (snd_intel8x0_codec_semaphore(chip, ac97->num) < 0) {
		if (! chip->in_ac97_init)
			dev_err(chip->card->dev,
				"codec_read %d: semaphore is not ready for register 0x%x\n",
				ac97->num, reg);
		res = 0xffff;
	} else {
		res = iagetword(chip, reg + ac97->num * 0x80);
		if ((tmp = igetdword(chip, ICHREG(GLOB_STA))) & ICH_RCS) {
			/* reset RCS and preserve other R/WC bits */
			iputdword(chip, ICHREG(GLOB_STA), tmp &
				  ~(chip->codec_ready_bits | ICH_GSCI));
			if (! chip->in_ac97_init)
				dev_err(chip->card->dev,
					"codec_read %d: read timeout for register 0x%x\n",
					ac97->num, reg);
			res = 0xffff;
		}
	}
+   dev_info(chip->card->dev, "ac97 read %d - %.2x : %.4x\n", ac97->num, reg, res);
	return res;
}


if you cannot enable LogFlowFunc of virtualbox

you need to add code to dump the value of ac97 read/write in intel8x0.c
and post the system log (dmesg)

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/tree/sound/pci/intel8x0.c

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1487168

Title:
  [Emulated AD1980 AC97 inside Virualbox 5.0, playback] volume slider
  problem

Status in Virtualbox:
  New
Status in alsa-driver package in Ubuntu:
  Incomplete
Status in virtualbox package in Ubuntu:
  Confirmed

Bug description:
  Volume Slider is only controlling PCM channel and is not controlling
  Master. In effect, Master is restricting the audio level to the
  default of approximately 45 Percent. In order to raise the Master
  Volume Level, alsamixer is capable of changing Master. Without
  manually raising Master to Max Volume, Volume Slider can only control
  volume from 0-45% which is the default level of Master.

  Description:	Ubuntu Wily Werewolf (development branch)
  Release:	15.10

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 4.1.0-3.3-generic 4.1.3
  Uname: Linux 4.1.0-3-generic x86_64
  ApportVersion: 2.18-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  gene       1330 F.... pulseaudio
                        gene       1922 F.... alsamixer
  CurrentDesktop: Unity
  Date: Thu Aug 20 13:00:57 2015
  InstallationDate: Installed on 2015-08-19 (1 days ago)
  InstallationMedia: Edubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150819)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_Card: Built-in Audio - Intel 82801AA-ICH
  Symptom_Type: Volume slider, or mixer problems
  Title: [ICH - Intel 82801AA-ICH, playback] volume slider problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/01/2006
  dmi.bios.vendor: innotek GmbH
  dmi.bios.version: VirtualBox
  dmi.board.name: VirtualBox
  dmi.board.vendor: Oracle Corporation
  dmi.board.version: 1.2
  dmi.chassis.type: 1
  dmi.chassis.vendor: Oracle Corporation
  dmi.modalias: dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:rvnOracleCorporation:rnVirtualBox:rvr1.2:cvnOracleCorporation:ct1:cvr:
  dmi.product.name: VirtualBox
  dmi.product.version: 1.2
  dmi.sys.vendor: innotek GmbH

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