[ltp] Some questions on the T21

[Thomas Hood]

 --- Nigel Metheringham <Nigel.Metheringham@VData.co.uk> wrote: 
 
>   3. tpctl appears unable to enable a serial port that has been
>      disabled in the BIOS - it says it does the right thing,
>      but the serial port drivers do not find it until its been
>      enabled in BIOS through a reboot (I am using modules before
>      you ask).

I found the same thing on my ThinkPad 600, if you are referring
to switching on and off.  tpctl can power off the serial port
if it's BIOS-powered-on, but can't power it on if it's BIOS-powered-off.
You would only want to power the port off, of course, if you are
trying to save battery energy.

"Powering on and off" concerns the RS-232 signals.  "Enabling and
disabling" is independent of this; it is implemented in the interface
chip.



=====
Linux on ThinkPad 600 page: http://panopticon.csustan.edu/thood/tp600lnx.htm

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