[alsa-devel] Intel 82801I (ICH9 Family) HD Audio Controller on a HP dv4 computer
jean-pierre.andre at wanadoo.fr
Mon Dec 15 11:10:12 CET 2008
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.
> > 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 ?
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