[Bug 671240] [NEW] ath9k locks kernel in 10 ms, causing e g audio dropout

David Henningsson 671240 at bugs.launchpad.net
Fri Nov 5 01:37:58 UTC 2010

Public bug reported:

I'm using Jack and trying to get low latency with the generic kernel.
I've been using the wakeup_rt tracer to try to hunt down the xruns, and
the result points toward the ath9k driver. The basic question is that
this computer has four cores (two cores with hyperthreading), so why
would ath9k block the audio in the first place - shouldn't it just run
on another core?

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: linux-image-2.6.35-23-generic 2.6.35-23.36
Regression: No
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.35-23.36-generic
Uname: Linux 2.6.35-23-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: amd64
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
 /dev/snd/controlC0:  david     18270 F.... pulseaudio
CRDA: Error: [Errno 2] Filen eller katalogen finns inte
 Card hw:0 'Intel'/'HDA Intel at 0xd4900000 irq 47'
   Mixer name	: 'Intel IbexPeak HDMI'
   Components	: 'HDA:111d7605,103c1413,00100402 HDA:80862804,80860101,00100000'
   Controls      : 22
   Simple ctrls  : 11
Date: Thu Nov  4 21:32:12 2010
EcryptfsInUse: Yes
HibernationDevice: RESUME=UUID=93c5c108-f711-417a-82c9-71d9485858dd
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
MachineType: Hewlett-Packard HP ProBook 4520s
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-23-generic root=UUID=eefc53ff-cf6c-4054-a570-f633d20a155a ro quiet splash
RelatedPackageVersions: linux-firmware 1.38
SourcePackage: linux
dmi.bios.date: 06/29/2010
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: 68AZZ Ver. F.08
dmi.board.name: 1413
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 57.1D
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvr68AZZVer.F.08:bd06/29/2010:svnHewlett-Packard:pnHPProBook4520s:pvr:rvnHewlett-Packard:rn1413:rvrKBCVersion57.1D:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP ProBook 4520s
dmi.sys.vendor: Hewlett-Packard

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug kernel-net maverick needs-upstream-testing

ath9k locks kernel in 10 ms, causing e g audio dropout
You received this bug notification because you are a member of Kernel
Bugs, which is subscribed to linux in ubuntu.

More information about the kernel-bugs mailing list