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SubjectRe: [regression] 2.6.25-rc4 snd-es18xx broken on Alpha
On 10-03-08 16:17, Rene Herman wrote:

> On 10-03-08 08:34, Michael Cree wrote:
>
>> Bob Tracy wrote:
>
>>> Supposedly with the ES1888, dma1 is for capture, dma2 is for
>>> playback. dma2 == 5 is a 16-bit channel, yes? That could explain
>>> much...
>
> It is, but what would it explain? You're only having playback problems,
> right?
>
>>>
>>> As for the values "chosen" for dma1 and dma2, they are the ones that
>>> keep showing up in the Alpha sound "howto" postings/documents.
>>
>> Running 'show config' in SRM on my Alphas (PWS500au and XP1000) reveals
>> the settings (except possibly for mpu_port) for the ESS1888 sound chip.
>> I recall that they are as reported in Alpha sound howtos.
>
> Can it be forced to use dma2=0 (an 8-bit channel, and the usual capture
> channel on es18xx)? However, that might not be the issue anyway:
>
>> I hadn't been using the ESS1888 for awhile, but have just tried it out
>> since you reported problems. I am running kernel 2.6.24.3 and Debian
>> testing on the XP1000. I tried playing a number of wav files with
>> alsa's aplay, sox's play and with mocp. I found that aplay and mocp
>> worked reliably through the ESS1888. Sox's play on some files did play
>> back a small extra segment of the file - particularly on short files and
>> usually some section near the end of the file - once it had completed
>> playing the file once; maybe this is what you are also observing.
>
> This sounds very suspiciously like a difference with playing through the
> native ALSA interface and the OSS emulaion. Could you and/or Bob confirm
> that sox is using the OSS emulation and not ALSA natively?

Bob is spam-blocking me (sigh...) so perhaps you can make sure he sees this.

> I could very well imagine the ALSA OSS emulation being broken on Alpha.
> I doubt any of teh developers has an Alpha. And if aplay works correctly
> this seems very likely.
>
> "sox" _can_ use ALSA natively as well by the way (see manpage for the
> version you have installed).
>
>> More onerously, my testing eventually ended in a complete system lock up!
>> I ran play (or was it aplay - sorry can't remember now)
>
> Vital if play is using the OSS interface...
>
>> and the system locked up. Got a response with ping across the network but
>> couldn't log in via ssh. Have been playing mplayer through the ESS1888
>> for the last couple of days (don't like it though - the sound quality of
>> the ESS1888 is not good enough for my ears) and haven't had another one
>> of those lockups since.
>
> Mmm.

Rene


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