Ubuntu
linux-source-2.6.17 package

  1. Bug #74034
  2. Comment #45

Comment 45 for bug 74034

Revision history for this message
stomarti (stomarti) wrote :

ttyS0 not working on my Toshiba Satellite 1805-S203 / Ubuntu 11.04 / Solution

ttyS0: LSR safety check engaged

Looking around I found the following message by Marc Haber on lkml.org:

The issue was udev loading smsc_ircc2. As soon as smsc_ircc2 is
loaded, the serial port shows the behavior listed above. Unloading the
module does not help, a reboot is needed.

http://lkml.org/lkml/2006/11/21/90

Blacklisting smsc_ircc2 module on Ubuntu 11.04 solved the problem here.