[Alsaplayer-devel] [rc4] audio CD bug

[Fred Galusik]

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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.

++
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
>> users because APIC 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 :)
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> alsaplayer-devel mailing list
> alsaplayer-devel at lists.tartarus.org
> http://lists.tartarus.org/mailman/listinfo/alsaplayer-devel
> 
>>
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