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SubjectttyS0 not working any more, LSR safety check engaged
Hi,

since a few kernel versions (I unfortunately do not have logs going
back more than two months, 2.6.17.13), the serial port on my hp compaq
nc8000 is not working any more.

The Linux kernel logs "ttyS0: LSR safety check engaged!" whenever I
try to use the port. Googling for this error message suggests that the
port may either not be present or broken. I can confirm that both are
not the case: The port is present and works fine both on Windows and
with an older Knoppix version using a very old 2.6 kernel (I think
2.6.4).

Is it possible that a moderately recent update to the driver is
broken? What can I do to debug? What information do you need?

Greetings
Marc

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