On Fri, Mar 14, 2014 at 6:41 PM, Fons Adriaensen <fons@xxxxxxxxxxxxxx> wrote: > On Fri, Mar 14, 2014 at 05:39:08PM +0530, Rustom Mody wrote: > >> Of late I am getting some amount of hiss from my speakers. >> I believe its a software problem because it is absent at startup and >> audibly starts sometime during the boot process. >> >> My system is fairly vanilla h/w -- ordinary Intel desktop with builtin >> soundcard, ordinary speakers. >> >> The only non-vanilla things maybe some things I installed when playing >> around with a TASCAM > > How on earth can anybody help you if you give so little information. Sorry not sure what else I should have given... lspci ? aplay -l ?? > > * Do you have active speakers (built-in amplifier) or is there an > amplifier in between the sound card and the speakser ? If so, which > input are you using ? How are things connected ? > > * Using ALSA/Jack/Pulse ?? No jack (to start with at least when the hiss sound starts) I am using debian -- which meant that there was no pulse until recently Of late I see occasionally some pulse related messages. eg I get these messages when I start audacity: ---------------------------------- ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe ALSA lib pcm.c:2239:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side ALSA lib pulse.c:243:(pulse_connect) PulseAudio: Unable to connect: Connection refused ALSA lib pulse.c:243:(pulse_connect) PulseAudio: Unable to connect: Connection refused Expression 'stream->playback.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4611 Expression 'stream->playback.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4611 Expression 'stream->playback.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4611 Expression 'stream->playback.pcm' failed in 'src/hostapi/alsa/pa_linux_alsa.c', line: 4611 --------------------------------- > > * TASCAM is a brand name. They are hundreds if not thousands of > different things with that name on it. So what is 'a TASCAM', > and what did you install for playing around ? Yeah I know :-) I guess the TASCAM reference is a red-herring. I tried it more than 2 years ago. There was no (hiss) issue then. Dont have the hardware right now so dont know the number/spec. The hiss has started after some recent debian upgrade -- couple of weeks > > Apart from that, hiss is usually the result of either > > - something broken, > - or using the wrong inputs, > - or a volume control set too high. > > Another cause could be the mic inputs of your sound card > routed to the outputs. Check the mixer. Are you asking for hardware or software checking? Hardware: There is only one connection -- the speaker into the soundcard. No mic, no line. Software: I will need to know how to check. For now, I checked with xfce4-mixer. If I turn down master or front-mic the hiss reduces However then musescore (my main use right now) also becomes too soft Interestingly there was a musescore upgrade just a day or two ago And now I am seeing segfaults with this message: $ Alsa_driver: pcm_drop(play): Input/output error pcmStop failed Segmentation fault Dont know that this has anything to do with the original hiss question. > > Ciao, > > -- > FA Thanks for the tips Rusi _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
