Although I am using a fresh installation of Ubuntu 8.10 on Toshiba Portege M200, I can confirm that I experienced identical symptoms as a consequence of installing "irda-utils". The "/etc/init.d/irda-setup" script in my case runs "modprobe smsc-ircc2" what somehow breaks "/dev/ttyS0" (does this also if I specify another port, eg. 0.2f8).
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