Mumble fails to stay connected using 3.13.0-66-generic kernel

[Laura Cowen]

Mumble can't stay connected to the server when using the 3.13.0-66-generic kernel. It's almost constantly using >100% CPU too.

It's fine when using the 3.13.0-65-generic kernel.

To reproduce, boot with the 3.13.0-66-generic kernel and start Mumble. It initially connects to the server but then disconnects. All other participants in the Mumble are displayed as connected but their 'lips' icons always stay greyed out and they can't be heard (although they can hear me).

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-66-generic 3.13.0-66.108
ProcVersionSignature: Ubuntu 3.13.0-66.108-generic 3.13.11-ckt27
Uname: Linux 3.13.0-66-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.15
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: laura 2234 F.... pulseaudio
CurrentDesktop: Unity
Date: Thu Oct 22 06:38:50 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2014-07-13 (465 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: Dell Inc. Dell System XPS L322X
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-66-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-66-generic N/A
 linux-backports-modules-3.13.0-66-generic N/A
 linux-firmware 1.127.15
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/15/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A09
dmi.board.name: 0PJHXN
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnDellInc.:bvrA09:bd05/15/2013:svnDellInc.:pnDellSystemXPSL322X:pvr:rvnDellInc.:rn0PJHXN:rvrA00:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Dell System XPS L322X
dmi.sys.vendor: Dell Inc.

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joe Ress (joeressington)]

I have replicated this bug on multiple machines with different audio chipsets and even tried an external USB sound card. I've replicated it on different flavours of Ubuntu and even on Linux Mint.

The only common factor in all of my tests is the 3.13.0-66 kernel.

32bit X86 is not affected.

[Luis Henriques (henrix)]

We have found a regression in this kernel that may or may not be related with this bug. This was bug #1508510 and I would like to ask you to test a kernel I've uploaded here:

http://people.canonical.com/~henrix/LP1508510/v1/amd64/

Could you please test this kernel and see if it fixes this issue? Thanks

[Laura Cowen (lauracowen)]

Awesome, that seems to work. Connected to Mumble and stayed connected. And I could speak/hear with someone else also connected.

Thank you!

[Luis Henriques (henrix)]

Thanks for testing, Laura. I'll just dup this bug with bug #1508510.