Maybe a bug with cmipci cmi8738 sound chip

Maybe a bug with cmipci cmi8738 sound chip

[Attila Konietzka]

Hello.
I write to you because nobody really on the alsa-user mailing list could
help me solve my problem, which is related to the cmi8738 on-board soundcard 
on my asus mainboard. Currently i am using the alsa-modules 0.9.6 version
available for the pre-made kernel-image 2.4.22 on debian.
My Problem is mainliy with the mic boost, in that it's effect is only on the
speakers level and the corresponding and resulting mic sensitivity if mic
boost is turned on.
However the record level remains unaffected by the activation of mic boost.
This is especially a problem for me, because my head-set requires this mic
boost to be turned on in order for the microphone signal to be send out in a
reasonable signal strength through my voice-chat program.
Also the normal sound-recording through ec command-line is affected by this
problem.
All corresponding volume sliders (mic, mic capture) are turned to maximum,
and the mic as center/lfe is turned off. What can i do?
I would like to hear from you, especially if you are aware of this problem, and
if there's currently anything i can do to fix this.
Regards, Attila.


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spurious APIC interrupt , then freeze

[Juan]

Soon after i load the maestro3 driver on a dell c600 laptop, kernel
2.6.0-test7; i get a 'spurious APIC interrupt on CPU#0, should never
happen.'

then the laptop freezes and i have to power off by pressing the power
button.

what does this mean ? how can it be fixed ?


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Re: spurious APIC interrupt , then freeze

[Takashi Iwai]

[-- Attachment #1: Type: text/plain, Size: 396 bytes --]

At Sun, 12 Oct 2003 23:32:53 +0200,
Juan wrote:
> 
> 
> Soon after i load the maestro3 driver on a dell c600 laptop, kernel
> 2.6.0-test7; i get a 'spurious APIC interrupt on CPU#0, should never
> happen.'
> 
> then the laptop freezes and i have to power off by pressing the power
> button.
> 
> what does this mean ? how can it be fixed ?

does the attached patch have some influence?


Takashi

[-- Attachment #2: m3-mpu-fix.dif --]
[-- Type: application/octet-stream, Size: 657 bytes --]

Index: alsa-kernel/pci/maestro3.c
===================================================================
RCS file: /suse/tiwai/cvs/alsa/alsa-kernel/pci/maestro3.c,v
retrieving revision 1.43
diff -u -r1.43 maestro3.c
--- alsa-kernel/pci/maestro3.c	12 Aug 2003 14:05:07 -0000	1.43
+++ alsa-kernel/pci/maestro3.c	14 Oct 2003 14:36:33 -0000
@@ -2349,7 +2349,8 @@
 {
 	unsigned long io = chip->iobase;
 
-	outw(ASSP_INT_ENABLE | MPU401_INT_ENABLE, io + HOST_INT_CTRL);
+	/* TODO: MPU401 not supported yet */
+	outw(ASSP_INT_ENABLE /*| MPU401_INT_ENABLE*/, io + HOST_INT_CTRL);
 	outb(inb(io + ASSP_CONTROL_C) | ASSP_HOST_INT_ENABLE,
 	     io + ASSP_CONTROL_C);
 }

Re: spurious APIC interrupt , then freeze

[Takashi Iwai]

At Tue, 14 Oct 2003 17:32:43 +0200,
jean-charles wrote:
> 
> On Tuesday 14 October, 2003 ╴ 04:38:41PM +0200, Takashi Iwai wrote:
> > At Sun, 12 Oct 2003 23:32:53 +0200,
> > Juan wrote:
> > > 
> > > 
> > > Soon after i load the maestro3 driver on a dell c600 laptop, kernel
> > > 2.6.0-test7; i get a 'spurious APIC interrupt on CPU#0, should never
> > > happen.'
> > > 
> > > then the laptop freezes and i have to power off by pressing the power
> > > button.
> > > 
> > > what does this mean ? how can it be fixed ?
> > 
> > does the attached patch have some influence?
> > 
> 
> hi,
> 
> i already have tried to do that :(  what really annoy me is that the
> freeze does not happend every time !!!!
> how can i "debug" a system freeze ?

if it's a kernel panic, you can at least have the control with magic
sysrq.  if it's not, the last resort is NMI watchdog...


Takashi


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