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Trent Piepho wrote: > I do not think the saa7134-alsa driver supports mmap. The cx88-alsa driver > also claimed to support mmap, but it never worked until I fixed it. It's > pretty clear that the code in saa7134-alsa was based on the same code as > cx88-alsa, so it's likely it has the same bug. You are right. The patch below (based on your cx88 patch, but I don't really understand it) fixes mmap support in saa7134-alsa for me. Recording via mmap (arecord -M -f S16_LE -c 2 -r 32000 -D hw:1) didn't work at all before, works now, tested for at least 20 minutes (but, unfortunately, with one overrun at least 0.719 ms long). Signed-off-by: Alexander E. Patrakov <patrakov@ums.usu.ru> Acked-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Trent Piepho <xyzzy@speakeasy.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>