[Alsaplayer-devel] [rc4] audio CD bug

[Dominique Michel]

Le Sun, 14 Oct 2007 15:32:25 +0200,
Fred Galusik <fred at zenwalk.fr> a écrit :

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> Ok, so, I have rebuilt the package with --enable-debug and without
> stripping the binary in order to make a gdb backtrace, but as the system
> froze, no luck to run "bt".
> Sorry.
> 
I get the sane kind problem with a kernel issue it was some time ago... I am
testing 2.6.23-rt1 in order to see if this have been fixed. But as it is a
random failure, I have to wait at lest a few days...

Maybe that it would be better to try a 2.6.23 kernel or play with the
kernel command line options in grub like pci=noacpi or noapic.

> ++
> Fred :)
> 
> Dominique Michel a écrit :
> > Le Sun, 14 Oct 2007 13:47:57 +0200,
> > Fred Galusik <fred at zenwalk.fr> a écrit :
> > 
> > Yes, I think the same about flac (I do maintain it for zenwalk ;) ), it
> > can't be the problem.
> > 
> > If you look at the zenwalk thread again, you will see that a user who
> > also use a RT kernel, hasn't got this trouble.
> > So, if it's kernel related, are there any other users, who don't use a
> > RT kernel, with this trouble ?
> > 
> > 
> >> The fact is that kernel related problems will much more appear with a rt
> >> kernel. The use of a rt kernel implies rt preemption of the tasks by the
> >> kernel and setting of the IRQ priority. For that to work reliably, the
> >> hardware must have no shared IRQ (I recommend already at the PIC level and
> >> that even for APIC 
Sorry, it is ACPI

> users because APIC
ACPI is not a completely new hardware
> >> design but some kind of glue over the PIC.) and the applications must be
> >> realtime safe.
> > 
> >> Another issue is that functions from Ingo Molnar rt patches are slowly
> >> doing their way into the vanilla kernel. As example, you can choose
> >> Preemptible kernel (Low latency desktop) in the kernel config and get low
> >> desktop latency with this setting and a vanilla kernel. If you add the
> >> realtime-lsm module with the correct configuration, you will be able to
> >> run jack as normal user without problem. I also think that such
> >> preemptible kernels can be a source of troubles with some hardwares.
> > 
> >> A lot of work have been done on the 2.6.22-mm kernel by the kernel guys
> >> and the ACPI guys in order to debug many issues with the ACPI. It can help
> >> some users (on ASUS motherboards and other) to try a 2.6.23 kernel (rt or
> >> not, I will not recommend a rt kernel for someone that doesn't know what
> >> he is doing).
> > 
> >> A workaround for desktop users can be to try to run their box at the PIC
> >> level with "pci=noacpi" in the grub kernel config line. But a laptop will
> >> not work without acpi.
> > 
> >> Dominique
> > 
> > ++
> > Fred :)
> > 
> > Dominique Michel a écrit :
> >>>> Le Sun, 14 Oct 2007 10:07:23 +0200,
> >>>> Fred Galusik <fred at zenwalk.fr> a écrit :
> >>>>
> >>>> Hi,
> >>>>
> >>>> Bug found when playing an audio CD on Zenwalk Linux :
> >>>> http://support.zenwalk.org/index.php?topic=11646.0
> >>>>
> >>>> When listening to an audio CD, the system freeze at the last second of
> >>>> the last audio song.
> >>>> Can someone confirm this bug ?
> >>>>
> >>>>> I cannot reproduce it. For the flac version in the bug report, it can
> >>>>> be a confusion from my side. The API changed between 1.1.2 and 1.1.3. A
> >>>>> detail changed again with 1.2. I tested AP with 1.1.2, 1.1.3, 1.1.4 and
> >>>>> 1.2.1, and it was fine. And in any case, the flac input plugin have
> >>>>> nothing to do with CD playing.
> >>>> GCC-4.1.1, GTK2-2.10.14, no GTK1 on the system.
> >>>> Do you need extra infos ?
> >>>>
> >>>>> I can suggest you to make a backtrace.
> >>>>> The only cases where I get system freeze with my PC are hardware
> >>>>> related, more exactly kernel bugs or shared IRQ. I use a rt kernel and
> >>>>> they are very sensitive in that matter.
> >>>>> Dominique
> >>>> ++
> >>>> Fred :)
> > _______________________________________________
> > alsaplayer-devel mailing list
> > alsaplayer-devel at lists.tartarus.org
> > http://lists.tartarus.org/mailman/listinfo/alsaplayer-devel
> > 
> >>
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> - --
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-- 
Dominique Michel

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