Hi Louigi, On 12/05/2014 09:43, Louigi Verona wrote:
Hey guys! Recently I've bought a Lenovo IdeaPad B590 laptop. As it is announced as an Ubuntu-certified laptop
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I am using Xubuntu 12.04 with kernel 3.8 now.
1. All real-time priorities and audio group and such standard stuff set up, checked and rechecked by myself and other people at LAC.
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*Problem 1. Xruns.* Even if nothing is done on the computer and/or with audio, xruns are generated. For instance, since I started writing this letter, JACK was on and right now I have an indicator of xruns in qjackctl which says: 7(13). Note, no audio programs are open at all. If I do nothing, just turn on JACK and leave laptop running, xruns are also generated.
You said you already check "standard stuff".. Did this include turning CPU Scaling off and setting _all cores_ to "performance"? In my experience this always makes a very big difference in quantity of xruns regardless of the sound card. Xubuntu doesn't have anything out of the box for that so you'll either have to use cpufrequtils or if intrested I've made a simple python-gtk front-end which sits in the tray for managing the task if you're interested...
Also switching off (internal) wifi improves the situation here.
*Problem 2. USB interruptions.* This problem occurs when I am using USB soundcard or USB headset. I get regular audible interruptions of audio signal. It has no bearing on xruns and occurs even outside of JACK, just when I am listening to Audacious, for example. I tried switching from PulseAudio to ALSA, same result. I though do not remember checking this with YouTube videos, for instance, and right now have no usb devices at hand to check.
I get the same problem with using the zoom H4 as a USB device and up to now found no solution. I recently got a zoom R8 and with that the issue doesn't seem to be present (although I haven't tested it much as USB device...) so I assume it *might* be a device problem.
So.. good luck and do share relevant results, as I think some general 'laptop' info might be interesting regardless of brands.
Lorenzo. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
