"And hyperthreading (usually a bios setting)?"
Will try to turn it off.
"Personal experience with an Acer tm 5720, even setting to powersave
governed makes xruns / fallouts go away."
are you suggesting that at powersave mode things are actually better? Why?
I just tried doing this, xruns continue to be generated.
"Did this include turning CPU Scaling off and setting _all cores_ to
"Also switching off (internal) wifi improves the situation here."
How do you switch it off?
On Mon, May 12, 2014 at 11:56 AM, Lorenzo Sutton
On 12/05/2014 09:43, Louigi Verona wrote:
Recently I've bought a Lenovo IdeaPad B590 laptop. As it is announced as
an Ubuntu-certified laptop
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.
*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
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.
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