At Sat, 22 Nov 2014 11:56:28 -0500,
Martin Cracauer wrote:
>
> Takashi Iwai wrote on Sat, Nov 22, 2014 at 05:32:52PM +0100:
> > At Fri, 21 Nov 2014 16:42:02 -0500,
> > Martin Cracauer wrote:
> > >
> > > I have one Debian system with 1.0.25 and a Ubuntu system with 1.0.27
> > > showing the same regression.
> > >
> > > Using
> > > amixer -D hw:0 set Speaker [something]
> > >
> > > I used to be able to say 3db+ which would approximately do just that.
> > >
> > > As of recent updates the actual adjustment happening on 3db+ is kind
> > > of random, way too small, sometimes even negative. It also does not
> > > correspond in any way to amixer's own idea of what the absolute dbs
> > > are:
> > >
> > > % amixer -D hw:0 set Speaker 14
> > > Simple mixer control 'Speaker',0
> > > Capabilities: pvolume pvolume-joined pswitch pswitch-joined
> > > Playback channels: Mono
> > > Limits: Playback 0 - 31
> > > Mono: Playback 14 [45%] [-25.50dB] [on]
> > > % amixer -D hw:0 set Speaker 3db+
> > > Simple mixer control 'Speaker',0
> > > Capabilities: pvolume pvolume-joined pswitch pswitch-joined
> > > Playback channels: Mono
> > > Limits: Playback 0 - 31
> > > Mono: Playback 3 [10%] [-42.00dB] [on]
> > >
> > > I see that on 2 machines and on different kinda of soundcards.
> > >
> > > Things are so bad that "3db+" is actually lowering the volume now
> > > depending on where you start.
> >
> > Use "3dB+" instead. It's case-sensitive.
>
> No, it's more broken (and it used to work with db all lowercase).
Elaborate how "more broken".
> I think the "db" in either casing makes it stop parsing and hence drop
> the +, too, setting it to 3 absolute no matter whether you have +, -
> or db or dB.
No, read the source code:
static int set_volume_simple(snd_mixer_elem_t *elem,
snd_mixer_selem_channel_id_t chn,
char **ptr, int dir)
....
if (*p == '%') {
percent = 1;
p++;
} else if (p[0] == 'd' && p[1] == 'B') {
vol_type = VOL_DB;
p += 2;
scale = 100;
} else
vol_type = VOL_RAW;
So it really needs to be "dB".
Takashi
------------------------------------------------------------------------------
Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server
from Actuate! Instantly Supercharge Your Business Reports and Dashboards
with Interactivity, Sharing, Native Excel Exports, App Integration & more
Get technology previously reserved for billion-dollar corporations, FREE
http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk
_______________________________________________
Alsa-user mailing list
Alsa-user@xxxxxxxxxxxxxxxxxxxxx
https://lists.sourceforge.net/lists/listinfo/alsa-user
