When going into standby, DP monitor emits horrible noises via attached speakers

[Andreas Schildbach]

I am using a Thinkpad T410s with a Dell 2711 connected via DisplayPort. Attached to the monitor, there is my speakers that I can use to listen to music that is transmitted via DisplayPort (or HDMI). Starting with Ubuntu 12.04, Ubuntu can transmit audio via DP.

However, when going into standby - either via inactivity timeout or via closing the lid - I hear horrible sound garbage.

This is quite loud and can possibly damage speakers and/or ears, depending on the sound level of whatever I heard before.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
ProcVersionSignature: Ubuntu 3.2.0-20.33-generic 3.2.12
Uname: Linux 3.2.0-20-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.0-0ubuntu2
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CompositorRunning: compiz
Date: Sat Mar 31 12:42:13 2012
DistUpgraded: 2011-12-03 14:26:18,327 DEBUG enabling apt cron job
DistroCodename: precise
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
MachineType: LENOVO 29123AG
ProcEnviron:
 TERM=xterm
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-20-generic root=UUID=b9fb2d9e-d248-4294-bd6b-9abe27dfcea4 ro quiet splash vt.handoff=7
SourcePackage: xserver-xorg-video-intel
UpgradeStatus: Upgraded to precise on 2011-12-03 (118 days ago)
dmi.bios.date: 05/10/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 6UET64WW (1.44 )
dmi.board.name: 29123AG
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr6UET64WW(1.44):bd05/10/2011:svnLENOVO:pn29123AG:pvrThinkPadT410s:rvnLENOVO:rn29123AG:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 29123AG
dmi.product.version: ThinkPad T410s
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.7.2-0ubuntu4
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.32-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.2-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.2-0ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu8
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

[Bryce Harrington (bryce)]

X.org does not handle sound anymore.

[Fabio Marconi (fabiomarconi)]

Hello
Is this fixed ?

---
Ubuntu Bug Squad volunteer triager
http://wiki.ubuntu.com/BugSquad

[Andreas Schildbach (schildbach)]

Did you fix it?

[Andreas Schildbach (schildbach)]

This is still present in quantal. All you need to do to reproduce is send sound via DisplayPort, play some song and send your device to standby (for example by closing the lid).

Note that this issue can be health threatening, if you happen to listen to music via headphone. Also, it can trash speakers.

[Marcus Tomlinson (marcustomlinson)]

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.

[Launchpad Janitor (janitor)]

[Expired for alsa-driver (Ubuntu) because there has been no activity for 60 days.]