Comment 0 for bug 1310260

Hi,
I wanted to install Trusty on my Elitebook 850 G1 with hybrid graphics (Intel / AMD) but pulseaudio goes nuts on me as soon as I try to play any music / sound, try to change volume, etc.
I've tried it with Ubuntu, Kubuntu and now with Xubuntu with the same result everytime.

My guess is that pulseaudio has problems with the AMD GPU and it's sound processor being switched off automatically as enabled by Kernerl 3.13 (formerly achieved by adding the radeon.runpm=1 kernel parameter)
(http://lists.freedesktop.org/archives/dri-devel/2013-September/045650.html)

root@HP-EliteBook-850-G1:~# cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynOff:0000:03:00.0
2:DIS-Audio: :Off:0000:03:00.1

As you can see, the AMD GPU has been turned off automatically. Pulseaudio, the (X)Ubuntu volume applet and KMix on the other hand list it as still available.
Based on that I asume pulseaudio tries to access a switched-off device and fails.

I've followed the steps listed
here: https://wiki.ubuntu.com/DebuggingSoundProblems
and
here: https://wiki.ubuntu.com/PulseAudio/Log

I'll attach the logs right away. (pulseverbose1.log and my dmesg output)

Pusleverbose is full of messages like this one:
( 0.013| 0.000) I: [pulseaudio] alsa-util.c: Error opening PCM device hw:0: No such file or directory

This output of dmesg also caught my attention:
[ 354.927935] HDMI ATI/AMD: no speaker allocation for ELD
[ 357.695010] hda-intel 0000:03:00.1: Disabling via VGA-switcheroo

One thing I noticed using Kubuntu is that after pulseaudio becomes unresponsive the taskmanager lists 4 pulseaudio processes two of which are "active on harddrive" ("Aktiv auf Festplatte"). Those two processes cannot be killed even as root.
Currently being on Xubuntu the same thing is true, although it lists only one process in the taskmanager that cannot be killed.

I hope you can help me.

Best regards,
Paul

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: pulseaudio 1:4.0-0ubuntu11
ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
Uname: Linux 3.13.0-24-generic x86_64
ApportVersion: 2.14.1-0ubuntu3
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC2', '/dev/snd/hwC2D0', '/dev/snd/pcmC2D3p', '/dev/snd/pcmC2D7p', '/dev/snd/controlC1', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D0c', '/dev/snd/pcmC1D0p', '/dev/snd/pcmC1D2c', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D7p', '/dev/snd/pcmC0D8p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: XFCE
Date: Sun Apr 20 13:47:09 2014
InstallationDate: Installed on 2014-04-20 (0 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
SourcePackage: pulseaudio
Symptom: audio
Symptom_Card: HDA-Intel - HDA Intel PCH
Symptom_Jack: Speaker, Internal
Title: [HP EliteBook 850 G1, IDT 92HD91BXX, Speaker, Internal] Pulseaudio fails to detect card
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/19/2014
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: L71 Ver. 01.08
dmi.board.name: 198F
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 15.54
dmi.chassis.asset.tag: CNU345BY96
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvrL71Ver.01.08:bd02/19/2014:svnHewlett-Packard:pnHPEliteBook850G1:pvrA3008CC10003:rvnHewlett-Packard:rn198F:rvrKBCVersion15.54:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 850 G1
dmi.product.version: A3008CC10003
dmi.sys.vendor: Hewlett-Packard