[LAU] Hello and configuring audio

[Florian Schmidt]

On Tuesday 08 January 2008, M-.-n wrote:
> Hi Flo,
>
> > The audio devices in many notebooks are a bit problematic.
>
> Yeah.. I guess so. Although I guess external usb devices should be ok.

Yes, they have their own bag of problem though ;)

> > Please let us see the output of
> >
> > lspci -v
>
> 00:1b.0 Audio device: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family)
> High Definition Audio Controller (rev 04)
> 	Subsystem: ASUSTeK Computer Inc. Unknown device 82a1
> 	Flags: bus master, fast devsel, latency 0, IRQ 5
> 	Memory at f7eb8000 (64-bit, non-prefetchable) [size=16K]
> 	Capabilities: <access denied>

I think intel ICH is one of the more problematic chipsets. Using a program 
where you have tight control over setting the audio interface parameters you 
could find a set of working ones and then try to get your other programs to 
use similar settings..

Things to try out would be:

a] different sampling rates [my first guess would be that 48khz works best]
b] opening the audio device playback only
c] use a perdiod sizo between 256 and 1024 and rather many periods..


>            CPU0
>   0:    3252114    XT-PIC-XT        timer
>   1:      44971    XT-PIC-XT        i8042
>   2:          0    XT-PIC-XT        cascade
>   3:     178743    XT-PIC-XT        uhci_hcd:usb1, ehci_hcd:usb5
>   5:     451891    XT-PIC-XT        uhci_hcd:usb4, HDA Intel,

This could be a bit problematic if you use the corresponding usb port..

> i915 at pci:0000:00:02.0, pciehp
>   7:         23    XT-PIC-XT        uhci_hcd:usb2
>   9:      68641    XT-PIC-XT        acpi
>  10:    1638393    XT-PIC-XT        uhci_hcd:usb3, pciehp, wifi0
>  11:          3    XT-PIC-XT        eth0, pciehp
>  12:     887680    XT-PIC-XT        i8042
>  14:          0    XT-PIC-XT        libata
>  15:      44113    XT-PIC-XT        libata
> NMI:          0
> ERR:          0

Flo

-- 
Palimm Palimm!
http://tapas.affenbande.org