Bug#428270: libopenal0a: sound is badly distorted on intel audio using alsa

[Eddy Petrișor]

Paul Wise wrote:
> 
> 00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
>         Subsystem: Dell Unknown device 01bd
> 
> 00:1b.0 0403: 8086:27d8 (rev 01)
>         Subsystem: 1028:01bd
> 
>         Flags: bus master, fast devsel, latency 0, IRQ 19
>         Memory at efebc000 (64-bit, non-prefetchable) [size=16K]
>         Capabilities: [50] Power Management version 2
>         Capabilities: [60] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
>         Capabilities: [70] Express Unknown type IRQ 0
>         Capabilities: [100] Virtual Channel
>         Capabilities: [130] Unknown (5)

I have the same audio card:
00:1b.0 0403: 8086:27d8 (rev 01)
        Subsystem: 1028:01bd
        Flags: bus master, fast devsel, latency 0, IRQ 225
        Memory at efffc000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 2
        Capabilities: [60] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
        Capabilities: [70] Express Unknown type IRQ 0
        Capabilities: [100] Virtual Channel
        Capabilities: [130] Unknown (5)

I use pulseaudio on an etch system. I installed (pinned) chromium from sid (it pulled openal from lenny) and the only
weird thing I could hear was some noise that sounded more like interference from the internal bus or bad quality
speakers. I think this is a hardware issue ...

I didn't try with oss as an openal backend, but probably the reason for the distortion happening only for alsa is that
in oss mode there is only one timing thread/one app accessing (or trying to access the sound card) causing enough delay
for the sound to resonate with the frequencies on some internal bus (which applies perfectlyto your case).

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-- 
Regards,
EddyP
=============================================
"Imagination is more important than knowledge" A.Einstein

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