[SATELLITE L750, Conexant CX20585, Speaker, Internal] speaker fails after a while; headphone jack still working

[Josip Bakić]

Sound works fine after restart, but then suddenly the speakers go silent. The headphone jack is still giving out sound, though. The problem never occurred before, I first noticed it only after a recent Linux kernel upgrade, so I suspect it may be related.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12
Uname: Linux 3.13.0-44-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: josip 6622 F.... pulseaudio
 /dev/snd/controlC0: josip 6622 F.... pulseaudio
 /dev/snd/pcmC0D0p: josip 6622 F...m pulseaudio
CurrentDesktop: Unity
Date: Sun Jan 25 14:46:36 2015
InstallationDate: Installed on 2014-09-27 (119 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_Jack: Speaker, Internal
Symptom_Type: Sound works for a while, then breaks
Title: [SATELLITE L750, Conexant CX20585, Speaker, Internal] fails after a while
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/24/2011
dmi.bios.vendor: INSYDE
dmi.bios.version: 2.40
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: Base Board Product Name
dmi.board.vendor: Intel Corp.
dmi.board.version: Base Board Version
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: OEM Chassis Manufacturer
dmi.chassis.version: OEM Chassis Version
dmi.modalias: dmi:bvnINSYDE:bvr2.40:bd08/24/2011:svnTOSHIBA:pnSATELLITEL750:pvrPSK30E-040006Y4:rvnIntelCorp.:rnBaseBoardProductName:rvrBaseBoardVersion:cvnOEMChassisManufacturer:ct10:cvrOEMChassisVersion:
dmi.product.name: SATELLITE L750
dmi.product.version: PSK30E-040006Y4
dmi.sys.vendor: TOSHIBA

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[MD4 (bruno-mueller)]

Hi

I have the same problem but I am using a Lenovo T410, it is using also the CX20585 chip

For me it fails with Ubuntu 15.04

[Ercan MUTLU (fercanm)]

Guys I have the same problem.Main reason is crappy Connexant Sound Chip. After 2 year suddenly happend to me.
THIS IS A HARDWARE ISSUE NOT OS. Due to the SOUND CHIP OVERHEATING SOUND CHIP GOES TO STATE OFF(But headphone work well) when over heating occurs..

SOLUTION
----------------
1. Change Motherboard (Toshiba Suppport Center tell me that:ISSUE IS FROM Connexant SoundChip, they cant change it so MOTHERBOARD HAVE TO)
2.PLACE A NICE COPPER PLATE OVER connexant chip.( I do, sound work well for more then 2 hours . I wish I have ı bigger ccupper plate :)
3.BUY I GOOD COOLER for a laptop.Place it near to the SOUND CHIP.
4.BUY A BLUETOOTH SPEAKER.

4.STOP ALSA.,WAIT FOR A WHILE TILL CHIP COOLS THEN START AGAIN.

Trust me there is no other way. I tried every think.