Bugzilla Bug 84276

I just upgraded from kernel 2.6.10-gentoo-r7 (amd64) to 2.6.11-gentoo-r2, and
am now having a strange problem with my sound system.  I have a 4-speaker
system attached to the ALC850 audio controller integrated into my mobo (Asus
A8V Deluxe), and am using the VIA 82xxx ALSA (1.08) driver built into the
kernel.  I have the 'duplicate front channel' option selected in my mixer, but
I am only getting sound from THREE of the four speakers--i'm missing the right
rear.  I've checked alsamixer to make sure both left and right rear are at full
volume and unmuted, and I've emerged the latest version of the alsa userland
(in my case just alsa-utils 1.08 and alsaplayer). This problem does not occur
with any 2.6.10 or earlier kernel that I try, but it does occur with both
2.6.11-gentoo-r2 and vanilla 2.6.11.  It also occurs with both alsaplayer and
arts-based applications like noatun and the KDE sound system.  Any suggestion
would be greatly appreciated.

Thanks,
Jason Harmening

Reproducible: Always
Steps to Reproduce:
1.Boot into a 2.6.11 kernel from development-sources or gentoo-dev-sources
2.Play any audio file


Actual Results:  
Sound comes from both front speakers but only left rear speaker.  All four 
speakers work in 2.6.10 and earlier. 

Expected Results:  
Emit sound through all four speakers. 

Portage 2.0.51.19 (default-linux/amd64/2004.3, gcc-3.4.3-20050110, 
glibc-2.3.4.20050125-r0, 2.6.11 x86_64) 
================================================================= 
System uname: 2.6.11 x86_64 AMD Athlon(tm) 64 Processor 3500+ 
Gentoo Base System version 1.6.9 
Python:              dev-lang/python-2.3.4-r1 [2.3.4 (#1, Feb 24 2005, 
19:29:42)] 
dev-lang/python:     2.3.4-r1 
sys-devel/autoconf:  2.59-r6, 2.13 
sys-devel/automake:  1.7.9-r1, 1.8.5-r3, 1.5, 1.4_p6, 1.6.3, 1.9.5 
sys-devel/binutils:  2.15.92.0.2-r4 
sys-devel/libtool:   1.5.10-r4 
virtual/os-headers:  2.6.8.1-r3 
ACCEPT_KEYWORDS="amd64" 
AUTOCLEAN="yes" 
CFLAGS="-march=athlon64 -O2 -pipe -fomit-frame-pointer" 
CHOST="x86_64-pc-linux-gnu" 
CONFIG_PROTECT="/etc /usr/kde/2/share/config /usr/kde/3.3/env
/usr/kde/3.3/share/config /usr/kde/3.3/shutdown /usr/kde/3/share/config
/usr/lib/X11/xkb /usr/lib/mozilla/defaults/pref /usr/share/config
/var/qmail/control" 
CONFIG_PROTECT_MASK="/etc/gconf /etc/terminfo /etc/env.d" 
CXXFLAGS="-march=athlon64 -O2 -pipe -fomit-frame-pointer" 
DISTDIR="/usr/portage/distfiles" 
FEATURES="autoaddcvs autoconfig ccache distlocks sandbox" 
GENTOO_MIRRORS="http://distfiles.gentoo.org 
http://distro.ibiblio.org/pub/Linux/distributions/gentoo" 
MAKEOPTS="-j2" 
PKGDIR="/usr/portage/packages" 
PORTAGE_TMPDIR="/var/tmp" 
PORTDIR="/usr/portage" 
SYNC="rsync://rsync.gentoo.org/gentoo-portage" 
USE="amd64 X acpi alsa arts berkdb bitmap-fonts cdr crypt cups curl f77 fam 
flac font-server foomaticdb fortran gif gpm gtk imagemagick ipv6 java jp2 jpeg 
kde lzw lzw-tiff motif mozilla multilib ncurses nls oggvorbis opengl oss pam 
perlpng python qt readline ssl tcpd tiff truetype truetype-fonts type1-fonts 
usb userlocales xml2 xmms xpm xrandr xv zlib" 
Unset:  ASFLAGS, CBUILD, CTARGET, LANG, LC_ALL, LDFLAGS, PORTDIR_OVERLAY

not a cable problem? :)

Strange, I have this problem on completely different hardware. It works fine
again in 2.6.11-mm3. Trying to find the specific fix...

Fixed in gentoo-dev-sources-2.6.11-r4