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)
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.
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