From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jean-Pierre ANDRE <jean-pierre.andre@wanadoo.fr>
Subject: Re: Intel 82801I (ICH9 Family) HD Audio Controller on
 a HP	dv4 computer
Date: Mon, 15 Dec 2008 11:10:12 +0100 (CET)
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Hi Takashi,

Than you for your help.

> 
> Switching to polling mode is OK and mostly harmless.  But single_cmd
> is not.  There is a VERY big difference between them.

Ok.

> > Probably related is the
> > fact that I have never seen an IRQ 22. 
> > 
> > from proc/interrupts :
> > 
> >  22:          0          0   IO-APIC-fasteoi   uhci_hcd:usb6, HDA Intel
> 
> Hum, then it must be an interrupt thing.
> Ask rather ACPI guys.
> 

Well, you must be right. Using the irqpoll boot option,
the sound is correct, and I see four IRQ 20 per second
(and none when there is no sound).

1) Can you confirm an expected IRQ every 250ms ?

The APIC routes PCI INT B to IRQ 22, and alsa is
expecting IRQ 22. Now I have to get alsa to expect
IRQ 20 or get APIC to route an appropriate PCI INT
to IRQ 22....

2) Now I get a warning "hda-intel: IRQ timing workaround
 is activated for card #0. Suggest a bigger bdl_pos_adj."

What is the range of values I should try ?

Regards

Jean-Pierre