Hi everyone,
I ran over a lot of Internet search and could not find any clue to this
issue.
I am trying to record sound on an old Thinkpad T22 that uses the cs46xx
sound driver.
Each time you start to record you have a 10% chance of having the recording
completely distorted and having a metallic sound. When you look at the
waveform it looks as though there are small segments with sharp transitions
between them, a little like if these segments were moved a little from their
correct place.
I've tried many many combination and none gives a solution, including
- Native OSS, 3.92, 4.0
- kernel 2.4, 2.6.11, 2.6.26 (rh7.3, fedora 1,2,7,8)
- Knoppix live CD
- Activate thinkpad=1 for the module
- Using native ALSA or OSS emulation.
- Changing fragment size
- Resetting mixer setting before recording
- Changing recording format LE,BE, 8bit, 16bit
- Changing recording frequency
- Disable ACPI
- Change IRQ of the sound-card
- Using a low-latency kernel and giving the recording process
real-time priority (FIFO_SCHED)
None gave an improvement. It works fine on the Win2k system that is
installed on the same computer.
Does anyone have any clue to what might be going on?
Is there any way to do a hard reset to the sound card (without
unloading-reloading the modules)?
Thank you for the help.
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
Alsa-user mailing list
Alsa-user@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/alsa-user