Re: nforce2 (snd_intel8x0) channels scrolling

[Richard Lemon <richard@clinicdesign.com.au>]

Hi Vladimir,

I have written a small program to show the channel scrolling problem on
the nforce 2 chipset. 

James tested it on his system and the problem did not occur. I tested it
on an Intel/Analog devices system the problem does not occur. It is
specific to the nforce2 chipset. 

I was wrong when I said it occurred on the intel system (There is
another problem I am tracking down in my code which does occur on both).

I am going to try to track down and fix the problem, but I have a fair
bit of learning to do before I will be able to figure it out.

Richard.

On Fri, 2003-11-14 at 01:48, Vladimir I. Umnov wrote:
> On Mon, 10 Nov 2003 23:35:13 +0000
> James Courtier-Dutton <James@superbug.demon.co.uk> wrote:
> 
> > Richard Lemon wrote:
> > > Hi All,
> > > 
> > > This is one of the problems I have been seeing with the intel8x0
> > > driver as well. The problem occurs when you call snd_pcm_start a
> > > second time after an xrun, or after you have shut down a program
> > > with ctl-c and started it again in the same console. I used the 
> > > 
> > > If you close the console and open a new one the problem seems to go
> > > away!? I used the example code pcm.c from the alsa-lib test
> > > directory.
> > > 
> > > It occurs with both [nforce2 ALC650] combo and [Intel 82901EB-ICH5
> > > Analog devices id 75].
> > > 
> > > I also have a problem when the drivers have been running for a long
> > > time (around 5 hours). Without an xrun the snd_pcm_delay() function
> > > starts returning impossible numbers. Checking drift against either
> > > rdtsc or gettimeofday() alsa starts giving me a 0.1 second per
> > > second drift.
> > > 
> > > I haven't got a machine I can set up for this style of kernel
> > > debugging unfortunately, so I am trying to code around these
> > > problems.
> > > 
> > > richard.
> > > 
> > > 
> > Would you be able to submit a small self contained (like the 
> > speaker-test code I submitted) source code that would reproduce the 
> > problem quickly.
> > I would expect that writing code to force xruns would be quite easy.
> > I have a ICH5 with ALC650 chip on Motherboard here, so I might be able
> > to help you out if I could reproduce your problem.
> try to open/close (without seeking) in mplayer or xine - always scrolls
> to next position (i think 3 positions at all).
> 
> 
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