On Thu, 17 May 2018, to...@tuxteam.de wrote:

Perhaps you might want to run arecord under strace (in both situations)
and compare results.
  good idea. I'll try that, but I found a way to make arecord
  to work in all cases(God knows why): adding the "-D copy" option, i.e.

     arecord -d 10 -f cd -D copy -t wav tst.wav

this works after adding
   pcm.copy {
      type plug
      slave {
        pcm hw
      route_policy copy

to .asoundrc.asoundconf

best regards,
Pierre Frenkiel

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