It looks like the patch finally made into the release. So the just-released minicom 1.83.0 seems to contain the fix that makes It work with the internal modem. I didn't try but I did look at the source.
I suggest distribution makers test it and make the update for their next rounds of CDs. For those still using the previous version, here's the patch: >--- minicom-1.82.orig/src/main.c Thu Aug 27 00:54:16 1998 >+++ minicom-1.82/src/main.c Thu Oct 14 16:20:00 1999 >@@ -158,7 +158,7 @@ > if (setjmp(albuf) == 0) { > portfd = -1; > signal(SIGALRM, get_alrm); >- alarm(2); >+ alarm(4); > #if defined(O_NDELAY) && defined(F_SETFL) > portfd = open(dial_tty, O_RDWR|O_NDELAY); > if (portfd >= 0){ >