Re: snd_hda + ath = hard hang

On Sun, 25 Nov 2007 22:19:15 +0200
Kostik Belousov <kostikbel_at_gmail.com> wrote:
> I have a laptop that shares interrupt between ath0 and snd_hda0
> devices. Machine works under the RELENG_6 normally. Now, on the
> RELENG_7 (and CURRENT), attempt to ifconfig ath0 up usualy hangs the
> machine in the next 2-5 minutes.
> 
> Hang is hard, I even cannot switch the console to look at the kernel
> messages or enter the ddb. Also, laptop does not have a serial port.
> 
> Not setting the ath0 up, or, unloading snd_hda.ko before activating
> the interface, allows machine to work. Wireless works without
> problem, interrupt rate is as expected.
> 
> Any advice ?
> 

Try enabling msi via hint.pcm.%d.msi="1" . It is disabled by default
due to too many broken msi.

There is a poor man polling mode which can be enabled through sysctl
dev.pcm.%d.polling=1, but I won't recommend this for typical usage
(unless to debug this kind of weird issues).

This regression probably originated from somewhere else since you said
it was working fine under RELENG_6.

> pciconf:
> 
> hostb0_at_pci0:0:0:0:	class=0x060000 card=0x00901025 chip=0x27a08086 rev=0x03
> hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = '955XM/945GM/PM/GMS/940GML Express Processor to
>     DRAM Controller' class      = bridge
>     subclass   = HOST-PCI
> none0_at_pci0:0:27:0:	class=0x040300 card=0x00901025 chip=0x27d88086 rev=0x02
> hdr=0x00
>     vendor     = 'Intel Corporation'
>     device     = '82801G (ICH7 Family) High Definition Audio'
>     class      = multimedia
> ath0_at_pci0:6:2:0:	class=0x020000 card=0x04181468 chip=0x001a168c rev=0x01
> hdr=0x00
>     vendor     = 'Atheros Communications Inc.'
>     device     = 'Atheros AR5005G Atheros AR5005G 802.11abg NIC
>     Chipset / TP-Link (TL-WN551G)' class      = network
>     subclass   = ethernet
> 


--
Ariff Abdullah
FreeBSD

... Recording in stereo is obviously too advanced
    and confusing for us idiot ***** users :P ........