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

[Martin Krüger]

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