Ubuntu
linux-source-2.6.15 package

Soundcard CT4832 (SB Live) has wrong input/output selections

Bug #24951 reported by jdo
4
Affects Status Importance Assigned to Milestone
linux-source-2.6.15 (Ubuntu)
Fix Released
Medium
Ben Collins

Bug Description

Problem: Selection an audio input source and selecting the input monitor option
gives random results. After clicking some input and output settings in the
mixer, I sometimes can record from a source, but often some other sound is mixed
with it. So recording cannot be used.
With the alsamixergui the settings can be set a little more specific, but the
same problems occur.
The output does work for sounds created by programs, but selecting line-in or
mic causes problems again.

My soundcard is a "Creative SoundBlaster Live 1024" (SBLive), which is a CT4830
(identical to CT4832). The EMU10K1 driver is used, and either selecting ALSA or
OSS has the same problems.

This problem exists for some time, with all kernels and with previous Ubuntu
versions.
Ubuntu: 5.10
Kernel: K7

Tags: breezy sound
Revision history for this message
jdo (jdo-deactivatedaccount) wrote :

Added info:
This problem seems to be with all Debian-based distribution.
The best way to test this, is to adjust the input gain and the selection of
input channel, this has influence on the output (e.g. playing a MP3).
The FreeSBIE and dynebolic LiveCDs do work with the CT4830/CT4832 soundcard.

Revision history for this message
Ben Collins (ben-collins) wrote :

If possible, please upgrade to Dapper's 2.6.15-9 kernel. If you do not want to
upgrade to Dapper, then you can also try the Dapper Flight 2 CD's:
http://cdimage.ubuntulinux.org/releases/dapper/flight-2/

Let me know if this bug still exists with this kernel.

Revision history for this message
jdo (jdo-deactivatedaccount) wrote :

I have tested the dapper flight-2 LiveCD, and the problem still exists.

Revision history for this message
jdo (jdo-deactivatedaccount) wrote :

The 'PCLinuxOS' LiveCD (with KDE, originally based on mandrake) and the
'basilisk' LiveCD (with KDE, based on Fedora) also work with this soundcard. I
don't understand all selections, but selecting the recording-input and selecting
the input-monitoring and input-gain is no problem.

Revision history for this message
jdo (jdo-deactivatedaccount) wrote :

The problem has been solved (already solved in Breezy).

A few months after I posted this problem, some updates together with a workaround solved this problem.
This will work: I never use the standard sound applet, but always the 'gnome-alsamixer' with these settings: the 'AC97' is set to zero, the 'Capture' controls the input gain, the 'rec' buttons sometimes have to be pressed twice.

The naming and making a selection is sometimes a problem, but I can make reliable recordings.

kind regards,
jdo

Ben Collins (ben-collins)
Changed in linux-source-2.6.15:
status: Unconfirmed → Fix Released
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