CS46xx oddness

CS46xx oddness

[Glenn Maynard]

(2.6.0 test11)

I'm seeing something odd with a CS46xx chip: if I don't set a buffer
size, or if I set it to 4k or 8k, then sound isn't played.  The buffer
fills up, and the device stays in SND_PCM_STATE_RUNNING.  If I set it
to 16k or 32k, it works.

I'm testing remotely on a user's machine, so I can't do much to
troubleshoot this (I'm not going to mess with his kernel).  In case
anyone's feeling brave, the relevant code is at

   http://cvs.sf.net/viewcvs.py/*checkout*/stepmania/stepmania/src/arch/Sound/ALSA9Helpers.cpp?rev=1.12

For reference, samplerate is 44100, channels is 2, and all dsnd* are
just pointers to snd*.  Sorry for not making a test case; it's 4am, so
I can't do it tonight, and this is a drop-in on IRC so I may not get
access to this machine again.  If nobody feels like looking at that
at all, I'll understand. :)

If it helps, here's /proc/asound/card0/pcm0p/sub0/* with an 8k, full buffer:

access: MMAP_INTERLEAVED
format: S16_LE
subformat: STD
channels: 2
rate: 44100 (44100/1)
period_size: 8
buffer_size: 8192
tick_time: 1000
card: 0
device: 0
subdevice: 0
stream: PLAYBACK
id: CS46xx
name: CS46xx
subname: subdevice #0
class: 0
subclass: 0
subdevices_count: 31
subdevices_avail: 30
64
state: RUNNING
trigger_time: 1072258017.688694000
tstamp      : 1072258028.517208000
delay       : 512
avail       : 7680
avail_max   : 7680
-----
hw_ptr      : 0
appl_ptr    : 512
tstamp_mode: NONE
period_step: 1
sleep_min: 0
avail_min: 8
xfer_align: 8
start_threshold: 0
stop_threshold: 1073741824
silence_threshold: 0
silence_size: 0
boundary: 1073741824


-- 
Glenn Maynard


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Re: CS46xx oddness

[Eloy A. Paris]

Is this card being actively maintained? I've seen several reports of
problems with this card (occasional metallic sound when recording,
SPDIF passthrough not working on some receivers, etc.) but haven't seen
any responses about possible solutions.

I wish I could volunteer to improve the driver for this card, but I
think my technical skills to be able to do so are lacking :(

I personally replaced my cs46xx-based card with a SoundBlaster Live! 5.1
because of the problems with the cs46xx driver.

Cheers,

Eloy.-

Glenn Maynard <g_sf@zewt.org> writes:

> (2.6.0 test11)
>
> I'm seeing something odd with a CS46xx chip: if I don't set a buffer
> size, or if I set it to 4k or 8k, then sound isn't played.  The buffer
> fills up, and the device stays in SND_PCM_STATE_RUNNING.  If I set it
> to 16k or 32k, it works.
>
> I'm testing remotely on a user's machine, so I can't do much to
> troubleshoot this (I'm not going to mess with his kernel).  In case
> anyone's feeling brave, the relevant code is at
>
>    http://cvs.sf.net/viewcvs.py/*checkout*/stepmania/stepmania/src/arch/Sound/ALSA9Helpers.cpp?rev=1.12
>
> For reference, samplerate is 44100, channels is 2, and all dsnd* are
> just pointers to snd*.  Sorry for not making a test case; it's 4am, so
> I can't do it tonight, and this is a drop-in on IRC so I may not get
> access to this machine again.  If nobody feels like looking at that
> at all, I'll understand. :)
>
> If it helps, here's /proc/asound/card0/pcm0p/sub0/* with an 8k, full buffer:
>
> access: MMAP_INTERLEAVED
> format: S16_LE
> subformat: STD
> channels: 2
> rate: 44100 (44100/1)
> period_size: 8
> buffer_size: 8192
> tick_time: 1000
> card: 0
> device: 0
> subdevice: 0
> stream: PLAYBACK
> id: CS46xx
> name: CS46xx
> subname: subdevice #0
> class: 0
> subclass: 0
> subdevices_count: 31
> subdevices_avail: 30
> 64
> state: RUNNING
> trigger_time: 1072258017.688694000
> tstamp      : 1072258028.517208000
> delay       : 512
> avail       : 7680
> avail_max   : 7680
> -----
> hw_ptr      : 0
> appl_ptr    : 512
> tstamp_mode: NONE
> period_step: 1
> sleep_min: 0
> avail_min: 8
> xfer_align: 8
> start_threshold: 0
> stop_threshold: 1073741824
> silence_threshold: 0
> silence_size: 0
> boundary: 1073741824
>
>
> -- 
> Glenn Maynard
>
>
> -------------------------------------------------------
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> Become an expert in LINUX or just sharpen your skills.  Sign up for IBM's
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