2010/1/25 J Yunke <yunke@xxxxxxxxxxxxxxxx>
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.
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.kid@xxxxxxxxx>
To: J Yunke <yunke@xxxxxxxxxxxxxxxx>
Subject: Re: 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 <yunke@xxxxxxxxxxxxxxxx>
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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