From: Nikolay Dimitrov <picmaster@mail.bg>
To: David Henningsson <david.henningsson@canonical.com>
Cc: Takashi Iwai <tiwai@suse.de>,
Clemens Ladisch <clemens@ladisch.de>,
alsa-devel@alsa-project.org, "Nikita N." <nikitan@operamail.com>
Subject: Re: Speaker burnout
Date: Tue, 31 Mar 2015 14:23:53 +0300 [thread overview]
Message-ID: <551A83C9.1070106@mail.bg> (raw)
In-Reply-To: <551A7A4D.203@canonical.com>
Hi David,
On 03/31/2015 01:43 PM, David Henningsson wrote:
>
>
> On 2015-03-31 12:06, Nikita N. wrote:
>>> If you have any concrete examples (alsa-info please!) of speakers
>>> that can be burned out, and you know a maximum speaker volume
>>> where this
>> As we said, that is not our bug, we are not audio experts, nor any
>> of us is interested in audio matters.
>
> Here's my suggestion how to move forward on this:
>
> 1) Gather consensus that limit the maximum volume on internal
> speakers is the right way forward. Takashi, Clemens, anyone against
> that strategy?
>
> 2) From the person with the hardware, we will need alsa-info (
> https://wiki.ubuntu.com/Audio/AlsaInfo ), and also the max volume
> where this does not happen. Is -6 dB good enough? -12 dB? I don't
> know - this is something someone with the hardware must tell us, it
> cannot simply be guessed.
>
> 3) I or someone else can write a kernel patch that limits the maximum
> volume of the speakers to the amount deducted from point 2).
> Considering that we're actually dealing with hardware breakage, this
> should be sent to stable as well. Then no userspace application can
> set the volume higher than our limit.
Probably a kernel patch is not necessary. asound.conf ans asound.state
can do similar job. If the master volume is fixed to a safe value, the
audio can be routed through softvol plugin, which can be used as a
replacement for the master volume control (the exact levels need to be
confirmed with someone who has access to the problematic hardware).
state.Intel {
control.1 {
comment.access 'read' // read-only
comment.type INTEGER
comment.count 2
comment.range '0 - 64'
comment.dbmin -6400
comment.dbmax 0
iface MIXER
name 'Speaker Playback Volume'
value.0 42 // safe volume levels
value.1 42 //
}
}
Could be even better if the HW master volume control is hidden (I don't
know how to do this), and the softvol control is exposes as master volume:
pcm.!default {
type softvol
slave.pcm "default"
control.name "Master Volume"
control.card 0
}
...something like this.
Kind regards,
Nikolay
next prev parent reply other threads:[~2015-03-31 11:24 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-28 14:03 bug Nikita N.
2015-03-30 7:19 ` bug Clemens Ladisch
2015-03-30 10:27 ` bug Nikita N.
2015-03-30 11:13 ` bug Clemens Ladisch
2015-03-30 14:37 ` bug Nikita N.
2015-03-31 7:18 ` bug Eliot Blennerhassett
2015-03-31 8:19 ` bug Nikita N.
2015-03-31 8:38 ` bug Clemens Ladisch
2015-03-31 9:05 ` bug Nikita N.
2015-03-31 12:42 ` bug Clemens Ladisch
2015-03-31 8:41 ` potential speaker burnout Eliot Blennerhassett
2015-03-31 8:24 ` bug Ricard Wanderlof
2015-03-31 8:56 ` bug Nikita N.
2015-03-31 9:14 ` bug Ricard Wanderlof
2015-03-31 10:26 ` bug Maarten de Boer
2015-03-31 10:49 ` bug Nikita N.
2015-03-31 11:05 ` bug Maarten de Boer
2015-03-31 11:44 ` bug Ricard Wanderlof
2015-03-31 8:54 ` bug Eliot Blennerhassett
2015-03-31 9:34 ` Speaker burnout David Henningsson
2015-03-31 10:06 ` Nikita N.
2015-03-31 10:43 ` David Henningsson
2015-03-31 10:57 ` Alexander E. Patrakov
2015-03-31 11:23 ` Nikolay Dimitrov [this message]
2015-03-31 11:31 ` Ricard Wanderlof
2015-03-31 11:45 ` David Henningsson
2015-03-31 13:47 ` Torsten Schenk
2015-03-31 19:14 ` Nikita N.
2015-04-05 16:36 ` Takashi Iwai
2015-04-05 16:11 ` Takashi Iwai
2015-04-07 5:30 ` Eliot Blennerhassett
2015-04-07 7:09 ` David Henningsson
2015-04-07 7:26 ` Clemens Ladisch
2015-04-07 7:49 ` Eliot Blennerhassett
2015-04-07 10:55 ` David Henningsson
2015-04-07 11:29 ` Ricard Wanderlof
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