linux-kernel - Re: [regression] 2.6.25-rc4 snd-es18xx broken on Alpha

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Date:	Mon, 10 Mar 2008 20:34:24 +1300
From:	Michael Cree <mcree@...on.net.nz>
To:	Bob Tracy <rct@...s.com>
CC:	Ivan Kokshaysky <ink@...assic.park.msu.ru>,
	linux-kernel@...r.kernel.org, linux-alpha@...r.kernel.org
Subject: Re: [regression] 2.6.25-rc4 snd-es18xx broken on Alpha

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...
> 
> 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.

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.   More
onerously, my testing eventually ended in a complete system lock up!
I ran play (or was it aplay - sorry can't remember now) 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.

Cheerz
Michael.
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