[2.6.0-test9] alsa intel8x0: scattered sound playback

[2.6.0-test9] alsa intel8x0: scattered sound playback

[Christian Kapeller]

Hi!

Since i'm running the 2.6.0 (2.6.0-test9-bk1 currently) kernel i encounter 
problems with alsa sound playback.

I got a Thinkpad A31 with Debian, so i use the intel8x0 driver. I compiled the 
drivers into the kernel. The compiling works just fine, also the sound playback 
runs without problems.

The sound is very scatterd and parts of the playback are repeated sometims. 
Stopping the playback and starting it again, fixes it - somtimes, and if then 
only for a couple of seconds.

I tested it with xmms (output: libALSA.so and libesdout.so), mpg123 and mplayer.
I tried it with and without esd.


lspci reports:
00:1f.5 Multimedia audio controller: Intel Corp. 82801CA/CAM AC'97 Audio Controller (rev 02)



/var/log/kern.log shows the following error messages:

----
Oct 28 18:18:08 xxxxxxxx kernel: ALSA sound/core/pcm_lib.c:155: Unexpected hw_pointer value (stream = 0, delta: -1314, max jitter = 8192): wrong interrupt acknowledge?
Oct 28 18:18:08 xxxxxxxx kernel: ALSA sound/core/pcm_lib.c:155: Unexpected hw_pointer value (stream = 0, delta: -1024, max jitter = 8192): wrong interrupt acknowledge?
Oct 28 18:19:29 xxxxxxxx kernel: ALSA sound/core/pcm_lib.c:155: Unexpected hw_pointer value (stream = 0, delta: -1084, max jitter = 8192): wrong interrupt acknowledge?
Oct 28 18:19:29 xxxxxxxx kernel: ALSA sound/core/pcm_lib.c:155: Unexpected hw_pointer value (stream = 0, delta: -1024, max jitter = 8192): wrong interrupt acknowledge?
--


I searched the web but didn't find a similar problem.
Does anyone have a clou?

Re: [2.6.0-test9] alsa intel8x0: scattered sound playback

[Takashi Iwai]

At Wed, 29 Oct 2003 15:41:55 +0100,
Christian Kapeller wrote:
> 
> Hi!
> 
> Since i'm running the 2.6.0 (2.6.0-test9-bk1 currently) kernel i encounter 
> problems with alsa sound playback.
> 
> I got a Thinkpad A31 with Debian, so i use the intel8x0 driver. I compiled the 
> drivers into the kernel. The compiling works just fine, also the sound playback 
> runs without problems.
> 
> The sound is very scatterd and parts of the playback are repeated sometims. 
> Stopping the playback and starting it again, fixes it - somtimes, and if then 
> only for a couple of seconds.

sounds like interrupts problem...  playing with ACPI ?

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

Re: [2.6.0-test9] alsa intel8x0: scattered sound playback

[Michael Dreher]

Mittwoch, 29. Oktober 2003 15:41 wrote Christian Kapeller:

> Since i'm running the 2.6.0 (2.6.0-test9-bk1 currently) kernel i
> encounter problems with alsa sound playback.
>

>
> The sound is very scatterd and parts of the playback are repeated
> sometims. Stopping the playback and starting it again, fixes it -
> somtimes, and if then only for a couple of seconds.

I can confirm this partly. 
Yesterday, playwave gave a scattered sound (skips and many repeated
sounds). Today playwave works. I could not get xmms working
(neither yesterday nor today). This is 2.6.0-test9.

xmms was fine in test5, running at half speed in test6 and test7, 
fine in test8, broken in test9.


But I did not get the following messages:

> /var/log/kern.log shows the following error messages:
>
> ----
> Oct 28 18:18:08 xxxxxxxx kernel: ALSA sound/core/pcm_lib.c:155:
> Unexpected hw_pointer value (stream = 0, delta: -1314, max jitter =
> 8192): wrong interrupt acknowledge? Oct 28 18:18:08 xxxxxxxx kernel:
> ALSA sound/core/pcm_lib.c:155: Unexpected hw_pointer value (stream =
> 0, delta: -1024, max jitter = 8192): wrong interrupt acknowledge? Oct
> 28 18:19:29 xxxxxxxx kernel: ALSA sound/core/pcm_lib.c:155: Unexpected
> hw_pointer value (stream = 0, delta: -1084, max jitter = 8192): wrong
> interrupt acknowledge? Oct 28 18:19:29 xxxxxxxx kernel: ALSA
> sound/core/pcm_lib.c:155: Unexpected hw_pointer value (stream = 0,
> delta: -1024, max jitter = 8192): wrong interrupt acknowledge? --

Michael

Re: [2.6.0-test9] alsa intel8x0: scattered sound playback

[Christian Kapeller]

Takashi Iwai <tiwai@suse.de> schrieb:
> At Wed, 29 Oct 2003 15:41:55 +0100,
> Christian Kapeller wrote:
>> 
>> Hi!
>> 
>> Since i'm running the 2.6.0 (2.6.0-test9-bk1 currently) kernel i encounter 
>> problems with alsa sound playback.
>> 
>> I got a Thinkpad A31 with Debian, so i use the intel8x0 driver. I compiled the 
>> drivers into the kernel. The compiling works just fine, also the sound playback 
>> runs without problems.
>> 
>> The sound is very scatterd and parts of the playback are repeated sometims. 
>> Stopping the playback and starting it again, fixes it - somtimes, and if then 
>> only for a couple of seconds.
>
> sounds like interrupts problem...  playing with ACPI ?

Correct. I'm playing with ACPI (Hail to the brave!). But i experienced
the same phenomenon also without PM and APM. Same log-messages, same
symptoms.