Re: [Bug 1804] New: IRQ/DMA related problem with ALSA drivers on ADM64

[Takashi Iwai]

At Wed, 07 Jan 2004 09:59:56 -0800,
Martin J. Bligh wrote:

> request_module: failed /sbin/modprobe -- snd-card-1. error = 256 
> request_module: failed /sbin/modprobe -- sound-slot-1. error = 256 
> request_module: failed /sbin/modprobe -- snd-card-1. error = 256 

they come likely from KDE, which probes two devices as default.

> ALSA sound/core/pcm_native.c:1267: playback drain error (DMA or IRQ trouble?) 
> ALSA sound/core/pcm_lib.c:214: Unexpected hw_pointer value (stream = 0, delta: -7, max 
> jitter = 5120): wrong interrupt acknowledge? 

since the delta value (the sample count of delayed interrupt) is
small, it looks like the interrupt handling is sloppy.  if it's an
ACPI problem, usually the delta value is much bigger.


--
Takashi Iwai <tiwai@xxxxxxx>		ALSA Developer - www.alsa-project.org
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