All of lore.kernel.org
 help / color / mirror / Atom feed
From: "Soeren D. Schulze" <soeren.d.schulze@gmx.de>
To: alsa-devel@alsa-project.org
Subject: Handling of the DXS controls in the via82xx driver
Date: Sun, 28 Mar 2010 00:04:23 +0100	[thread overview]
Message-ID: <4BAE8EF7.20204@gmx.de> (raw)

Hi everyone,

before my latest upgrade to Linux 2.6.32 (yes, sorry, it's Debian), I
had four levers in my alsamixer: VIA DXS, VIA DXS 1, VIA DXS 2 and VIA
DXS 3.  They controlled the hardware mixing when accessing the sound
device multiple times.

Now they have disappeared.  I think I can pretty certainly trace this
down to commit 2fb930b53f513cbc4c102d415d2923a8a7091337 to Linux
[http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.32.y.git;a=commit;h=2fb930b53f513cbc4c102d415d2923a8a7091337],
which "move[s] DXS volume controls to PCM interface".

As I'm not an ALSA developer, I don't realize the intended effect of
this change, but the actual effect is that I cannot change the DXS
volumes any more.  mplayer still controls the global PCM volume.  Well,
in fact, there is one way.  While an mplayer is running, I can do:

amixer cset numid=47,iface=PCM,name='PCM Playback Volume' 24,24

When restarting mplayer, the volume is reset to 31,31 (maximum).  Commit
3d00941371a765779c4e3509214c7e5793cce1fe
[http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.33.y.git;a=commit;h=3d00941371a765779c4e3509214c7e5793cce1fe]
seems to be responsible for this.

The bad thing about it is that 31,31 is a really bad setting for my
poorly engineered sound card.  It distorts a lot.

I suspect that the real *bug* is that mplayer does not use the
per-channel DXS controls even though it's supposed to (which seems to be
why the DXS controls are called "PCM Playback Volume").

Personally, rather than fixing this bug, I would just revert to the
former state.  I was always happy with all the DXS levers set to 75%.


Thank you

Sören
_______________________________________________
Alsa-devel mailing list
Alsa-devel@alsa-project.org
http://mailman.alsa-project.org/mailman/listinfo/alsa-devel

             reply	other threads:[~2010-03-27 23:04 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-27 23:04 Soeren D. Schulze [this message]
2010-03-29  1:24 ` Handling of the DXS controls in the via82xx driver Raymond Yau
2010-03-29  1:39 ` Raymond Yau
2010-03-29 12:56 ` Clemens Ladisch
2010-03-29 13:21   ` Soeren D. Schulze
2010-03-31 23:00     ` Raymond Yau
2010-03-31  1:39   ` Raymond Yau

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4BAE8EF7.20204@gmx.de \
    --to=soeren.d.schulze@gmx.de \
    --cc=alsa-devel@alsa-project.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.