NetBSD Problem Report #32569

From ggm@apnic.net  Thu Jan 19 03:26:19 2006
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Date: Thu, 19 Jan 2006 13:25:43 +1000 (EST)
From: ggm@apnic.net
Reply-To: ggm@apnic.net
To: gnats-bugs@netbsd.org
Subject: auich driver initializes to wrong ac97 rate at boot
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>Number:         32569
>Category:       kern
>Synopsis:       auich device initializes ac97 to wrong rate at boot
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Jan 19 03:30:00 +0000 2006
>Closed-Date:    Sat Sep 23 01:28:42 +0000 2006
>Last-Modified:  Thu Oct 13 13:05:01 +0000 2016
>Originator:     George Michaelson
>Release:        NetBSD 3.99.15
>Organization:
George Michaelson       |  APNIC                 
Email: ggm@apnic.net    |  PO Box 2131 Milton    
Phone: +61 7 3858 3150  |  QLD 4064 Australia    
  Fax: +61 7 3858 3199  |  http://www.apnic.net  
>Environment:


System: NetBSD garlic.apnic.net 3.99.15 NetBSD 3.99.15 (GGMSMALL) #1: Wed Jan 18 10:11:08 EST 2006 ggm@garlic.apnic.net:/data/Build/obj/usr/src/sys/arch/i386/compile/GGMSMALL i386
Architecture: i386
Machine: i386
>Description:
	On boot, auich driver attach probes the ac97 rate via some code
	imported from FreeBSD. its designed to set the rate to a normalized
	value, typically 48000hz or 44100 hz or the like.

	From time to time, on my IBM X31 laptop its being set to a very odd
	rate. This appears to be irreversable at runtime, there being no
	hook I can see which re-initializes the rate.

	I believe all the exposed controls via audioctl are adjusting downstream
	values which pass through the boot-set ac97 rate.

	Here  are two /var/log/messages logs of the auich initialization
	at boot time. The first is the wrong calibration, the second is
	a warm boot, which cleared it back to the right setting.

Jan 19 09:24:50 garlic /netbsd: auich0 at pci0 dev 31 function 5: i82801DB/DBM (ICH4/ICH4M) AC-97 Audio
Jan 19 09:24:50 garlic /netbsd: auich0: interrupting at irq 11
Jan 19 09:24:50 garlic /netbsd: auich0: ac97: Analog Devices AD1981B codec; headphone, 20 bit DAC, no 3D stereo
Jan 19 09:24:50 garlic /netbsd: auich0: ac97: ext id 601<AC97_22,AMAP,VRA>
Jan 19 09:24:50 garlic /netbsd: auich0: measured ac97 link rate at 76803 Hz, will use 77000 Hz
Jan 19 09:24:50 garlic /netbsd: audio0 at auich0: full duplex, mmap, independent

Jan 19 11:42:09 garlic /netbsd: auich0 at pci0 dev 31 function 5: i82801DB/DBM (ICH4/ICH4M) AC-97 Audio
Jan 19 11:42:09 garlic /netbsd: auich0: interrupting at irq 11
Jan 19 11:42:09 garlic /netbsd: auich0: ac97: Analog Devices AD1981B codec; headphone, 20 bit DAC, no 3D stereo
Jan 19 11:42:09 garlic /netbsd: auich0: ac97: ext id 601<AC97_22,AMAP,VRA>
Jan 19 11:42:09 garlic /netbsd: auich0: measured ac97 link rate at 48003 Hz, will use 48000 Hz
Jan 19 11:42:09 garlic /netbsd: audio0 at auich0: full duplex, mmap, independent


>How-To-Repeat:
	I don't know if this is host specific. Its an older (2yo) IBM laptop
	and it may represent fading of some part like a crystal sync for the
	audio chip/synth.

	the symptom is that audio output appears to be severely rate mangled
	(typically sounding like its 3-4x slowed down)


>Fix:
	I think the fix is going to require work on sys/dev/pci/auich.c
	in the auich_calibrate() routine. It has the comment:

	auich_calibrate() was from FreeBSD: ich.c,v 1.22 2002/06/27 
		22:36:01 scottl Exp    



>Release-Note:

>Audit-Trail:
From: TAMURA Kent <kent@NetBSD.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: kern/32569: auich driver initializes to wrong ac97 rate at boot
Date: Fri, 20 Jan 2006 20:45:42 +0900 (JST)

 I have no idea on how to fix auich_calibrate().
 Anyway, you can avoid the problem by adding
 "hw.auich0.ac97rate=48000" to /etc/sysctl.conf.

 -- 
 TAMURA Kent <kent_2006 at hauN.org> <kent at NetBSD.org>

From: George Michaelson <ggm@apnic.net>
To: gnats-bugs@netbsd.org
Cc: kent@netbsd.org, kern-bug-people@netbsd.org,
	gnats-admin@netbsd.org, netbsd-bugs@netbsd.org
Subject: Re: kern/32569: auich driver initializes to wrong ac97 rate at boot
Date: Mon, 23 Jan 2006 10:12:10 +1000

 If the auich manpages are updated to note the hw sysctl, I would be
 content. I've added this entry in my sysctl.conf.

 You can close the bug as far as I am concerned.

 cheers, and thanks

 -George

State-Changed-From-To: open->closed
State-Changed-By: jmcneill@netbsd.org
State-Changed-When: Sat, 23 Sep 2006 01:28:42 +0000
State-Changed-Why:
Submitter claims that the PR can be closed.


From: "Masatake Daimon" <pho@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/32569 CVS commit: src/share/man/man4
Date: Thu, 13 Oct 2016 13:04:02 +0000

 Module Name:	src
 Committed By:	pho
 Date:		Thu Oct 13 13:04:02 UTC 2016

 Modified Files:
 	src/share/man/man4: auich.4

 Log Message:
 PR kern/32569: Describe the sysctl variable the driver provides


 To generate a diff of this commit:
 cvs rdiff -u -r1.23 -r1.24 src/share/man/man4/auich.4

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

>Unformatted:

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