[Nut-upsdev] Re: Serial Ports (Was Re: Common Power Management : NUT and HAL (stage 1))

[David Zeuthen]

On Fri, 2006-09-15 at 23:43 +0100, Matthew Garrett wrote:
> On Wed, Sep 13, 2006 at 09:04:32PM -0400, David Zeuthen wrote:
> 
> > Also: we certainly can't run serial PNP probing automatically, only in
> > response to a user choice of deciding to probe for serial ports. I say
> > this because maybe it will crash some old devices or some that don't
> > support Serial PNP. This is correct, yes?
> 
> The protocol is designed in such a way that it's unlikely to trigger 
> anything bad, but it's potentially possible that some hardware will do 
> mad things when standard serial lines are asserted. I've /heard/ horror 
> stories that some UPSes will power off when they see a PnP query - does 
> anyone actually have a verified case of this happening?
> 
> There would certainly be issues doing PnP on a serial port being used as 
> a serial console, but that's true of any serial port that's currently in 
> use.

Right. I only asked to see if we want to run serial PNP as part of the
hald startup.. for auto-configuration of serial ports.. Looks like,
based on the feedback in this thread, that we don't want to do that.

Cheers,
David