I hit this issue on Mint 16 (which is derived from 13.10, running PulseAudio 4.0), on an MSI X370 laptop, which also has Realtek ALC269VB. I have been able to identify the issue (in a way), and work around it for now using pavucontrol, though it's clearly wrong.
The problem is that the normal capture stream for the "Built-in Analogue Stereo" device is completely distorted, to the point where it appears to be just flat noise with no correlation to anything the microphone captures. It's not truly the case, you can actually hear certain loud sounds when you bump up the capture volume, but they're very, very mangled and unrecognisable. However, the *Monitor* of Built-in Analogue Stereo has perfectly fine, clear sound. I don't know enough about PA to pinpoint the issue, but it shows that the problem is purely in the software and has nothing to do with hardware or faulty drivers. If I were to chance a guess, I'd say it's something like the wrong codec or sample format being output, different than what is advertised. Because the monitor stream collects all data passing through, it has the ability to replicate the capture stream, but is apparently not affected by whatever is causing the ordinary capture stream to mangle its data. Now, the workaround is to install pavucontrol, and in Input Devices tab set the Monitor of Built-in Analogue Stereo as the fallback device. This will make all apps use that rather than the capture device directly, thus letting you use the microphone. It's ugly as sin and very wrong, but it works while we look for a real solution. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to alsa-driver in Ubuntu. https://bugs.launchpad.net/bugs/998862 Title: [TECRA R850, Realtek ALC269VB, Mic, Internal] No sound captured at all Status in “alsa-driver” package in Ubuntu: Confirmed Bug description: This computer is running Precise 64 bit upgraded from Oneiric 64 bit. Sound was working fine until today 5/13/12 Updated with the latest updates and sound does not work. Computer is dual boot with Win 7, in Win 7 the microphone works fine, so I do not think it is a hardware problem Tried following instructions using alsamixer, unmuted mic - but it didn't help The maximum I get is a sort of hissing/white noise recorded No idea why this has stopped working. Skype does not capture sound, Sound recorder does not capture sound. Audacity does not capture anything but a faint hiss. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: alsa-base 1.0.25+dfsg-0ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14 Uname: Linux 3.2.0-24-generic x86_64 NonfreeKernelModules: fglrx AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24. ApportVersion: 2.0.1-0ubuntu7 Architecture: amd64 ArecordDevices: **** List of CAPTURE Hardware Devices **** card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog] Subdevices: 1/1 Subdevice #0: subdevice #0 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: kibi 2146 F.... pulseaudio kibi 12009 F.... gnome-alsamixer /dev/snd/controlC0: kibi 2146 F.... pulseaudio kibi 12009 f.... gnome-alsamixer Card0.Amixer.info: Card hw:0 'PCH'/'HDA Intel PCH at 0xcc520000 irq 50' Mixer name : 'Realtek ALC269VB' Components : 'HDA:10ec0269,11790626,00100100' Controls : 19 Simple ctrls : 11 Card1.Amixer.info: Card hw:1 'Generic'/'HD-Audio Generic at 0xcc420000 irq 51' Mixer name : 'ATI R6xx HDMI' Components : 'HDA:1002aa01,00aa0100,00100200' Controls : 6 Simple ctrls : 1 Card1.Amixer.values: Simple mixer control 'IEC958',0 Capabilities: pswitch pswitch-joined penum Playback channels: Mono Mono: Playback [on] Date: Sun May 13 21:48:13 2012 InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012) PackageArchitecture: all SourcePackage: alsa-driver Symptom: audio Symptom_AlsaRecordingTest: ALSA recording test through plughw:PCH failed Symptom_Card: Built-in Audio - HDA Intel PCH Symptom_DevicesInUse: 2146 12009 2146 12009 kibi F.... pulseaudio kibi F.... gnome-alsamixer /dev/snd/controlC0: kibi F.... pulseaudio kibi f.... gnome-alsamixer Symptom_Jack: Mic, Internal Symptom_Type: No sound at all Title: [TECRA R850, Realtek ALC269VB, Mic, Internal] No sound at all UpgradeStatus: Upgraded to precise on 2012-04-29 (14 days ago) dmi.bios.date: 08/06/2011 dmi.bios.vendor: TOSHIBA dmi.bios.version: Version 3.00 dmi.board.asset.tag: 0000000000 dmi.board.name: Portable PC dmi.board.vendor: TOSHIBA dmi.board.version: Version A0 dmi.chassis.asset.tag: 0000000000 dmi.chassis.type: 10 dmi.chassis.vendor: TOSHIBA dmi.chassis.version: Version 1.0 dmi.modalias: dmi:bvnTOSHIBA:bvrVersion3.00:bd08/06/2011:svnTOSHIBA:pnTECRAR850:pvrPT520E-00W012H2:rvnTOSHIBA:rnPortablePC:rvrVersionA0:cvnTOSHIBA:ct10:cvrVersion1.0: dmi.product.name: TECRA R850 dmi.product.version: PT520E-00W012H2 dmi.sys.vendor: TOSHIBA To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/998862/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
