I found the simplest workaround: switching off the HDMI sound card in pavucontrol.
-- You received this bug notification because you are a member of Desktop Packages, which is subscribed to pulseaudio in Ubuntu. https://bugs.launchpad.net/bugs/1310260 Title: Pulseaudio fails to detect card (probably due to hybrid graphics) Status in “pulseaudio” package in Ubuntu: Confirmed Bug description: 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 Kernel 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1310260/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
