ubuntu-bug alsa-base No analog loopback on HD Audio in Karmic 2.6.31-rc8

[Anders Kirchenbauer]

Binary package hint: alsa-base

There is no analog loopback in the ALSA stack on this kernel in Karmic Alpha 5 for Intel HD Audio;
there was an analog loopback in Jaunty and previous.

$ cat /proc/version
Linux version 2.6.31-9-generic (buildd@crested) (gcc version 4.4.1 (Ubuntu 4.4.1-3ubuntu3) ) #29-Ubuntu SMP Sun Aug 30 17:39:26 UTC 2009

$ lspci -nn -vvv
00:14.2 Audio device [0403]: ATI Technologies Inc SBx00 Azalia (Intel HDA) [1002:4383]
 Subsystem: Elitegroup Computer Systems Device [1019:2816]
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=slow >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 64, Cache Line Size: 64 bytes
 Interrupt: pin ? routed to IRQ 16
 Region 0: Memory at fe8f0000 (64-bit, non-prefetchable) [size=16K]
 Capabilities: <access denied>
 Kernel driver in use: HDA Intel
 Kernel modules: snd-hda-intel

$ amixer scontrols

Simple mixer control 'Master',0
Simple mixer control 'PCM',0
Simple mixer control 'Front Mic Jack Mode',0
Simple mixer control 'Center',0
Simple mixer control 'LFE',0
Simple mixer control 'Line Jack Mode',0
Simple mixer control 'Mic Jack Mode',0
Simple mixer control 'IEC958',0
Simple mixer control 'IEC958 Default PCM',0
Simple mixer control 'IEC958 Playback Source',0
Simple mixer control 'Capture',0
Simple mixer control 'Capture',1
Simple mixer control 'Capture',2
Simple mixer control 'Input Source',0
Simple mixer control 'Input Source',1
Simple mixer control 'Input Source',2
Simple mixer control 'Mux',0
Simple mixer control 'Mux',1
Simple mixer control 'Mux',2
Simple mixer control 'PC Beep',0
Simple mixer control 'Speaker',0
Simple mixer control 'Speaker',1
Simple mixer control 'Speaker',3
Simple mixer control 'Swap Center/LFE',0

[Daniel T Chen (crimsun)]

commit d78d7a90adf793943cc29a414b6f4364a700aad5
Author: Takashi Iwai <email address hidden>
Date: Mon Mar 2 14:26:25 2009 +0100

    ALSA: hda - Create "Analog Loopback" controls optionally

    Don't create "Analog Loopback" controls as default since these controls
    are usually more harmful than useful for normal users.
    Only created when "loopback = yes" hint is given.

    Signed-off-by: Takashi Iwai <email address hidden>