Bug 453471

Summary: kernel update causes sound to play too fast
Product: [Fedora] Fedora Reporter: Tom Tromey <tromey>
Component: kernelAssignee: Jaroslav Kysela <jkysela>
Status: CLOSED DUPLICATE QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: low Docs Contact:
Priority: low    
Version: 8CC: kernel-maint, patrickm
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Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2008-07-10 10:36:26 EDT Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Tom Tromey 2008-06-30 16:29:43 EDT
Description of problem:

Sometime recently I "yum update"d my F8 box.  After this update,
all songs sound like they are sung by the chipmunks -- the playback
is too fast.

After some debugging on #pulseaudio we concluded that this is an alsa
problem.  (I disabled pulseaudio and used mplayer's alsa back end to
verify the problem remained.)

Version-Release number of selected component (if applicable):

opsy. uname -a
Linux opsy #1 SMP Fri Jun 13 16:38:52 EDT 2008 i686 i686 i386

/proc/asound/cards says:

opsy. cat /proc/asound/cards
 0 [I82801BAICH2   ]: ICH - Intel 82801BA-ICH2
                      Intel 82801BA-ICH2 with AD1885 at irq 17

opsy. grep 'front DAC' /proc/asound/card0/codec97#0/ac97#0-0
PCM front DAC    : 48000Hz

Also, saw this in /var/log/messages:

Jun 29 08:58:03 opsy kernel: intel8x0_measure_ac97_clock: measured 50944 usecs
Jun 29 08:58:03 opsy kernel: intel8x0: measured clock 78 rejected
Jun 29 08:58:03 opsy kernel: intel8x0: clocking to 48000

This looks vaguely like this alsa bug report:

Comment 1 Martin Burchell 2008-07-04 19:02:13 EDT
Same problem for me after updating to kernel-

Adding this line to /etc/modprobe.conf fixed it for me:
options snd-intel8x0 ac97_clock=48000

See also
Comment 2 Tom Tromey 2008-07-10 10:36:26 EDT

*** This bug has been marked as a duplicate of 441087 ***