[ltp] Re: Turn off IrDA Scanning?

Tod Harter linux-thinkpad@linux-thinkpad.org
Fri, 5 Dec 2003 07:47:50 -0500

On Wednesday 03 December 2003 2:53 pm, Marius Gedminas wrote:
> For other sysctls you could also add that value to /etc/sysctl.conf, but
> this might not work in this instance.  It all depends on the relative
> order of init scripts, i.e. if irattach is started after sysctls were
> set, it would just reenable the discovery.

As far as I know /etc/sysctl.conf is generally processed right out of the 
master init script

[tharter@snake rc.d]$ grep sysctl.conf *
rc.sysinit:action "Configuring kernel parameters: " sysctl -e -p 

At least on Mandrake it happens EARLY in the boot sequence, just after things 
like devfs initializes and stuff like that, so any normal service 
initializations will (logically enough) override it. My guess would be that 
on Mandrake/Red Hat and probably SuSe that something in /etc/sysconfig 
controls irda configuration. Read the /etc/init.d/irda script, it should 
source something out of /etc/sysconfig early on to find those options. 
> > Can I make this a permanent kernel
> > parameter somehow?
> AFAIU the kernel starts with discovery disabled, but helpful
> distribution init scripts that call irattach may enable it.
> HTH,
> Marius Gedminas

Tod Harter
Giant Electronic Brain