amd64/178671: snd_hda stops working as soon as X starts

[John Baldwin]

The following reply was made to PR kern/178671; it has been noted by GNATS.

From: John Baldwin <jhb at freebsd.org>
To: freebsd-amd64 at freebsd.org,
 Anton Shterenlikht <mexas at bristol.ac.uk>
Cc: FreeBSD-gnats-submit at freebsd.org
Subject: Re: amd64/178671: snd_hda stops working as soon as X starts
Date: Mon, 20 May 2013 09:46:51 -0400

 On Wednesday, May 15, 2013 3:35:01 pm Anton Shterenlikht wrote:
 > 
 > >Number:         178671
 > >Category:       amd64
 > >Synopsis:       snd_hda stops working as soon as X starts
 > >Confidential:   no
 > >Severity:       non-critical
 > >Priority:       low
 > >Responsible:    freebsd-amd64
 > >State:          open
 > >Quarter:        
 > >Keywords:       
 > >Date-Required:
 > >Class:          sw-bug
 > >Submitter-Id:   current-users
 > >Arrival-Date:   Wed May 15 19:40:02 UTC 2013
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Anton Shterenlikht
 > >Release:        FreeBSD 10.0-CURRENT amd64
 > >Organization:
 > University of Bristol 
 > >Environment:
 > System: FreeBSD mech-aslap239.men.bris.ac.uk 10.0-CURRENT FreeBSD 10.0-
 CURRENT #33 r250633: Tue May 14 20:11:05 BST 2013 root at mech-
 aslap239.men.bris.ac.uk:/usr/obj/usr/src/sys/BUZI amd64
 > 
 > 
 > 	
 > >Description:
 > 
 > This is HP Compaq 6715s laptop.
 > The sound card is:
 > 
 > hdac0 at pci0:0:20:2:      class=0x040300 card=0x30c2103c chip=0x43831002 
 rev=0x00 hdr=0x00
 >     vendor     = 'Advanced Micro Devices [AMD] nee ATI'
 >     device     = 'SBx00 Azalia (Intel HDA)'
 >     class      = multimedia
 >     subclass   = HDA
 > 
 > I have in the kernel:
 > 
 > device          sound           # Generic sound driver (required)
 > device          snd_hda         # Intel High Definition Audio
 > 
 > In dmesg:
 > 
 > hdac0: <ATI SB600 HDA Controller> mem 0xc0000000-0xc0003fff irq 16 at device 
 20.2 on pci0
 > 
 > Before X starts I can get sound via /dev/dsp,
 > or play CDs with
 > dd if=/dev/cd0 of=/dev/dspcd bs=2352
 > 
 > HOwever, as soon I start X, e.g. with xdm,
 > or simply "X -config /root/xorg.conf.new -retro"
 > I cannot get any sound anymore until a reboot.
 > 
 > On the console I see lots of messages:
 > 
 > hdac0: Unexpected unsolicited response from address 0: 00000040
 > hdac0: Unexpected unsolicited response from address 0: 00400104
 > hdac0: Unexpected unsolicited response from address 0: 00000001
 > hdac0: Unexpected unsolicited response from address 0: 0000000f
 > hdac0: Unexpected unsolicited response from address 0: 410710f0
 > hdac0: Unexpected unsolicited response from address 0: 00000010
 > hdac0: Unexpected unsolicited response from address 0: 00000040
 > hdac0: Unexpected unsolicited response from address 0: 00400083
 > hdac0: Unexpected unsolicited response from address 0: 00000000
 > hdac0: Unexpected unsolicited response from address 0: 04a12020
 > hdac0: Unexpected unsolicited response from address 0: 00001727
 > hdac0: Unexpected unsolicited response from address 0: 00000020
 > hdac0: Unexpected unsolicited response from address 0: 00400187
 > hdac0: Unexpected unsolicited response from address 0: 00000002
 > hdac0: Unexpected unsolicited response from address 0: 00000e03
 > hdac0: Unexpected unsolicited response from address 0: 0181302e
 > hdac0: Unexpected unsolicited response from address 0: 00001737
 > hdac0: Unexpected unsolicited response from address 0: 00000020
 > hdac0: Unexpected unsolicited response from address 0: 00400301
 > hdac0: Unexpected unsolicited response from address 0: 00000001
 > hdac0: Unexpected unsolicited response from address 0: 00000002
 > hdac0: Unexpected unsolicited response from address 0: 4145f0f0
 > hdac0: Unexpected unsolicited response from address 0: 00000010
 > hdac0: Unexpected unsolicited response from address 0: 00000040
 
 This sounds like the display driver is DMA'ing to the wrong place or writing 
 to the wrong registers.  Can you check the output of pciconf -lcb to make sure 
 there are no collisions between BARs?  Also, which GPU hardware/driver is in
 your laptop?
 
 -- 
 John Baldwin