[alsa-devel] PATCH - MIDI on ice1724 - real-time kernel problem SOLVED(?)

[Martin Krüger]

Martin Krüger schrieb:
> Takashi Iwai schrieb:
>   
>> At Mon, 26 May 2008 12:54:32 +0200,
>> Martin Krüger wrote:
>>   
>>     
>>> Pavel Hofman wrote:
>>>     
>>>       
>>>> Martin Krüger wrote:
>>>>   
>>>>       
>>>>         
>>>>> Pavel Hofman wrote:
>>>>>     
>>>>> Hi, 
>>>>>
>>>>> thanks a lot for taking care for that issue. 
>>>>> I just tried it out by modifying the following files from the 2.6.26-rc3 kernel:
>>>>>
>>>>> sound/pci/Kconfig (modified by hand)
>>>>> sound/pci/ice1712/ice1712.h (modified by hand)
>>>>> sound/pci/ice1712/envy24ht.h (modified by hand)
>>>>> sound/pci/ice1712/ice1724.c (copied from the actual Git snapshot)
>>>>>
>>>>> I double-checked all the handmade changes, should be ok. 
>>>>>
>>>>> Midi in via "amidi -p hw:0 -d" works now without problem, 
>>>>> but when trying to write to the device, for example by "amidi -p hw:0 -s txdata.syx" 
>>>>> it causes an immediate crash. 
>>>>>
>>>>> That would not be a problem for me, but jackd probes all ports, and is unusable now.
>>>>>
>>>>> Perhaps i forgot a patch, is the output working for you? 
>>>>>     
>>>>>         
>>>>>           
>>>> Hello Martin,
>>>>
>>>> I did check the MIDI output using command
>>>>
>>>> amidi -p hw:0 -S F0411042110C000000000074FF0411042110C000000
>>>>
>>>> Ubuntu Studio 7.10, both -generic and -rt kernel, Audiotrak Prodigy 192, 
>>>> the original patch (I assume the current git version is identical).
>>>>
>>>> There was no MIDI device connected to the output as I have none.
>>>>
>>>> I traced if MIDI-out on Juli goes through the Xilinx CPLD, and it seemed 
>>>> the MIDI lines go straight to the connectors, just as on my Prodigy 192. 
>>>> Unfortunately, I do not have Juli available any more to test the patch.
>>>>
>>>> Please could you provide more details about the crash?
>>>>
>>>> Thanks,
>>>>
>>>> Pavel.
>>>> _______________________________________________
>>>> Alsa-devel mailing list
>>>> Alsa-devel at alsa-project.org
>>>> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>>>>   
>>>>       
>>>>         
>>> Hello Pavel,
>>>
>>> i just compiled a new 2.6.25.4 kernel with realtime support. the kernel 
>>> is from kernel.org, so without any patches except the realtime patch 
>>> from the alsa wiki.
>>>     
>>>       
>> To be sure -- does 2.6.25.4 without realtime support work?
>>
>>
>> Takashi
>>   
>>     
> No. Not with an unpatched kernel set to "Preemptible Kernel (Low-Latency 
> Desktop) PREEMPT_DESKTOP". I didn't test the lower preemption modes.
>
> Martin
> _______________________________________________
> Alsa-devel mailing list
> Alsa-devel at alsa-project.org
> http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
>   
Hi,

i just compiled a 2.6.25-3 with Preemption disabled and i still get the 
the same.

Midi in works, Midi out leads to a complete system freeze.
Is there a workaroud of disabling just Midi out? That would solve the 
bug for me, and would prevent other users from freezing their system...

Thanks for your help,
Martin