Bugzilla Bug 231451

I have a Pinnacle PCTV Stereo TV tuner, and since I upgraded from kernel 2.6.24
to 2.6.25, the sound outputted from the card's analog audio output is just
white noise on every channel (but video is OK). I am using the tvtime as a TV
viewer.
My kernel configuration is the default genkernel config, only change is that
CONFIG_NO_HZ and CONFIG_HZ_1000 are set.

Reproducible: Always

Steps to Reproduce:




dmesg |grep -i saa:
saa7130/34: v4l2 driver version 0.2.14 loaded
saa7134[0]: found at 0000:04:06.0, rev: 1, irq: 18, latency: 64, mmio:
0xfebffc00
saa7134[0]: subsystem: 11bd:002b, board: Pinnacle PCTV Stereo (saa7134)
[card=26,autodetected]
saa7134[0]: board init: gpio is 6000
saa7134[0]: i2c eeprom 00: bd 11 2b 00 f8 f8 1c 00 43 43 a9 1c 55 d2 b2 92
saa7134[0]: i2c eeprom 10: 00 f0 00 00 ff 20 ff ff ff ff ff ff ff ff ff ff
saa7134[0]: i2c eeprom 20: 01 40 01 03 03 ff 03 01 08 ff 00 1c ff ff ff ff
saa7134[0]: i2c eeprom 30: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
saa7134[0]: i2c eeprom 40: ff 07 00 c0 86 ff 01 01 ff ff ff ff ff ff ff ff
saa7134[0]: i2c eeprom 50: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
saa7134[0]: i2c eeprom 60: 0c 22 17 4d 03 08 d2 47 ff ff ff ff ff ff ff ff
saa7134[0]: i2c eeprom 70: ff ff ff ff ff ff ff ff 74 30 ff ff ff ff ff ff
saa7134[0]: i2c eeprom 80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
saa7134[0]: i2c eeprom 90: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
saa7134[0]: i2c eeprom a0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
saa7134[0]: i2c eeprom b0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
saa7134[0]: i2c eeprom c0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
saa7134[0]: i2c eeprom d0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
saa7134[0]: i2c eeprom e0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
saa7134[0]: i2c eeprom f0: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
tuner' 2-0043: chip found @ 0x86 (saa7134[0])
tuner' 2-0060: chip found @ 0xc0 (saa7134[0])
saa7134[0]: registered device video0 [v4l2]
saa7134[0]: registered device vbi0


emerge --info
Portage 2.1.4.4 (default-linux/x86/2007.0/desktop, gcc-4.1.2, glibc-2.6.1-r0,
2.6.25-gentoo-r6 i686)
=================================================================
System uname: 2.6.25-gentoo-r6 i686 AMD Athlon(tm) 64 X2 Dual Core Processor
5200+
Timestamp of tree: Wed, 09 Jul 2008 20:04:01 +0000
ccache version 2.4 [disabled]
app-shells/bash:     3.2_p33
dev-java/java-config: 1.3.7, 2.1.6
dev-lang/python:     2.4.4-r13
dev-python/pycrypto: 2.0.1-r6
dev-util/ccache:     2.4-r7
sys-apps/baselayout: 1.12.11.1
sys-apps/sandbox:    1.2.18.1-r2
sys-devel/autoconf:  2.13, 2.61-r2
sys-devel/automake:  1.5, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2, 1.10.1
sys-devel/binutils:  2.18-r3
sys-devel/gcc-config: 1.4.0-r4
sys-devel/libtool:   1.5.26
virtual/os-headers:  2.6.23-r3
ACCEPT_KEYWORDS="x86"
CBUILD="i686-pc-linux-gnu"
CFLAGS="-O2 -march=i686 -pipe"
CHOST="i686-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config
/usr/kde/3.5/shutdown /usr/share/config"
CONFIG_PROTECT_MASK="/etc/env.d /etc/env.d/java/ /etc/fonts/fonts.conf
/etc/gconf /etc/php/apache2-php5/ext-active/ /etc/php/cgi-php5/ext-active/
/etc/php/cli-php5/ext-active/ /etc/revdep-rebuild /etc/splash /etc/terminfo
/etc/udev/rules.d"
CXXFLAGS="-O2 -march=i686 -pipe"
DISTDIR="/usr/portage/distfiles"
FEATURES="distlocks metadata-transfer parallel-fetch sandbox sfperms strict
unmerge-orphans userfetch"
GENTOO_MIRRORS="http://distfiles.gentoo.org
http://distro.ibiblio.org/pub/linux/distributions/gentoo"
LC_ALL="en_US.UTF-8"
LINGUAS="en"
MAKEOPTS="-j3"
PKGDIR="/usr/portage/packages"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress
--force --whole-file --delete --stats --timeout=180 --exclude=/distfiles
--exclude=/local --exclude=/packages"
PORTAGE_TMPDIR="/var/tmp"
PORTDIR="/usr/portage"
PORTDIR_OVERLAY="/usr/local/portage"
SYNC="rsync://rsync.gentoo.org/gentoo-portage"
USE="X a52 aac aalib acl acpi alsa amr amrnb amrwb asf berkdb bluetooth cairo
cdr cli cracklib crypt css cups dbus dri dvb dvd dvdr dvdread eds emboss encode
esd evo exif fam ffmpeg firefox flac fortran gdbm gif gpm gtk hal iconv ipv6
irda isdnlog jack jpeg kde kerberos ldap live lm_sensors mad midi mikmod mp3
mpeg mudflap musepack ncurses nforce2 nls nptl nptlonly nsplugin nvidia ogg
opengl openmp oss pam pcmcia pcre pdf pmu png ppds pppd python qt3 qt3support
qt4 quicktime rdesktop readline reflection rtsp samba scanner sdl session snmp
spell spl ssl svg tcpd theora tiff truetype unicode usb v4l v4l2 vcd vorbis
win32codecs wxwindows x264 x86 xcomposite xcompositejack xine xml xorg
xscreensaver xv xvid xvmc zlib" ALSA_CARDS="ali5451 als4000 atiixp atiixp-modem
bt87x ca0106 cmipci emu10k1 emu10k1x ens1370 ens1371 es1938 es1968 fm801
hda-intel intel8x0 intel8x0m maestro3 trident usb-audio via82xx via82xx-modem
ymfpci" ALSA_PCM_PLUGINS="adpcm alaw asym copy dmix dshare dsnoop empty extplug
file hooks iec958 ioplug ladspa lfloat linear meter mulaw multi null plug rate
route share shm softvol" APACHE2_MODULES="actions alias auth_basic authn_alias
authn_anon authn_dbm authn_default authn_file authz_dbm authz_default
authz_groupfile authz_host authz_owner authz_user autoindex cache dav dav_fs
dav_lock deflate dir disk_cache env expires ext_filter file_cache filter
headers include info log_config logio mem_cache mime mime_magic negotiation
rewrite setenvif speling status unique_id userdir usertrack vhost_alias"
ELIBC="glibc" INPUT_DEVICES="keyboard mouse evdev" KERNEL="linux"
LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses
text" LINGUAS="en" USERLAND="GNU" VIDEO_CARDS="apm ark chips cirrus cyrix dummy
fbdev glint i128 i740 i810 imstt mach64 mga neomagic nsc nv r128 radeon
rendition s3 s3virge savage siliconmotion sis sisusb tdfx tga trident tseng v4l
vesa vga via vmware voodoo"
Unset:  CPPFLAGS, CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LDFLAGS,
PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS

Would it be possible for you to bisect this?

The general procedure is outlined here:
http://www.reactivated.net/weblog/archives/2006/01/using-git-bisect-to-find-buggy-kernel-patches/

In this case, because it is a specific driver that is having the problem, it
might be best to start off by just looking at changes made to that driver. You
can do that by starting the bisect with the command: "git bisect start --
drivers/media/video/saa7134".

If you need any assistance with this just ask.

Created an attachment (id=160176) [details]
fix for 2.6.25

Actually, I've already done it.
The problem is already fixed upstream on the v4l-dvb tree. I've reverse
bisected it to locate the change that fixed it:
http://git.kernel.org/?p=linux/kernel/git/mchehab/v4l-dvb.git;a=commitdiff;h=c117d05cd4c09342f97ba1c6ef63f0bae3239a39
I've backported the change to 2.6.25 and it works fine here.

fixed in gentoo-sources-2.6.25-r7