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. ------------------------------------------------------------------------------ Throughout its 18-year history, RSA Conference consistently attracts the world's best and brightest in the field, creating opportunities for Conference attendees to learn about information security's most important issues through interactions with peers, luminaries and emerging and established companies. http://p.sf.net/sfu/rsaconf-dev2dev _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
