2010/1/25 J Yunke <yu...@productivity.org>
> I've tried both LINE and MIC physical inputs, and I get the same results
> for both. All of the capture inputs are zero except for the one I'm
> currently trying. Any other ideas?
>
I got it in the digital side. All the capture and mic boost stuff seems to
be doing nothing. I made some progress with
lshal |grep info\.product |less
That gave me all the devices seen in there. I took a keyword from any device
that looked interesting and ran
lshal |grep -C12 keyword for the individual entry I came down to
/dev/snd/pcmC0D0c as the capture device. I should know what to do with that,
but I don't :-(.
The Business kid.
>
> -- Justin
>
> On Mon, 25 Jan 2010, Business Kid wrote:
>
> Date: Mon, 25 Jan 2010 09:05:30 +0000
>> From: Business Kid <business....@gmail.com>
>> To: J Yunke <yu...@productivity.org>
>> Subject: Re: [Alsa-user] snd_via82xx snaps/pops/crackles when recording
>> (only)
>>
>>
>> This isn't a solution (I have a similar problem myself) but go into
>> alsamixer and discover where your sound is actually coming from, by
>> lowering
>> each capture thingy to zero,
>>
>> 2010/1/25 J Yunke <yu...@productivity.org>
>> Hi Everyone --
>>
>> I have spent several hours trying to get recording to work
>> correctly on
>> a hacked Wyse terminal running Slax linux. Playing works
>> perfectly, but
>> recording causes snaps & pops akin to a vinyl record. I get a
>> light pop
>> between every 1/2 second and every 5 seconds (random).
>>
>> Any suggestions? Feel free to RTFM me if there are some
>> tweaks/settings
>> I should try. Thanks! See below for detail.
>>
>> -- Justin
>>
>> ###
>>
>> Here are the specs:
>>
>> lspci:
>> Multimedia audio controller: VIA Technologies, Inc. VT82C686
>> AC97 Audio
>> Controller
>>
>> uname:
>> Linux slax 2.6.27.27 #1 SMP Wed Jul 22 07:27:34 AKDT 2009 i686
>> VIA Samuel
>> 2 CentaurHauls GNU/Linux
>>
>> dmesg:
>> VIA 82xx Audio 0000:00:11.5: setting latency timer to 64
>>
>> alsa version:
>> 1.0.17
>>
>> system/motherboard:
>> Wyse 9450
>> VT8601 chipset
>>
>> hardware specs:
>> VIA Samuel 2 550MHz processor
>> 512MB Disk on Module
>> 512MB SDRAM
>>
>> programs used:
>> aplay
>> arecord
>> ices (streaming audio)
>>
>> ####
>>
>> Other info:
>>
>> - I have tried two Wyse 9450s so far, so it's not a single bad
>> device.
>>
>> - Recording works without any issues when using Windows XPe on
>> the same
>> hardware.
>>
>> - Playing works without any issues. Most of the posts I've
>> found via
>> google are about crackling noises while playing -- which has
>> never been a
>> problem.
>>
>> - I have never gotten any underruns, overruns, or any other
>> errors in the
>> ring buffer (dmesg).
>>
>> - Load average never exceeds .90 with ices, memory isn't being
>> peaked or
>> dropping to swap.
>>
>> - I primarily used ices to try things, but also used arecord
>> piped to
>> aplay with similar results.
>>
>> ####
>>
>> I have tried:
>>
>> - 48000hz vs. 41000hz vs 22050hz vs 1 channel vs 2 channel vs
>> 8-bit vs
>> 16-bit (mixtures).
>>
>> - Tweaking the 'periods' and 'buffer_time' settings in ices. I
>> was able
>> to reduce the crackling by going to a period of 2 and a buffer
>> time of
>> 500ms, but it's still crackling the same as arecord.
>>
>> - Messing with dxs_support and ac97_quirks settings (no effect).
>>
>> - Messing with setpci for the latency_timer (no effect).
>>
>> - Messing with just about every BIOS setting relating to PCI,
>> power
>> management, ACPI, PNP, etc.
>>
>> - Compiling the latest snd-via82xx driver (no effect; I compared
>> the
>> source code and the primary changes are related to the 8233
>> chipsets).
>>
>> - Using chrt to run ices at REALTIME (made it much worse).
>>
>> - Using nice to run ices at a higher priority (no effect).
>>
>> - Killing any extraneous processes.
>>
>> - Obvious stuff like verifying that the audio source is clean
>> (it is).
>>
>> - Replacing the power supply.
>>
>>
>> ---------------------------------------------------------------------------
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>>
>>
>>
>>
>>
>
> -- Justin
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attendees to learn about information security's most important issues through
interactions with peers, luminaries and emerging and established companies.
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