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From: Dave Mischler <jake@mischler.com>
To: Adrian Chadd <adrian@freebsd.org>
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Cc: freebsd-wireless@freebsd.org
Subject: Re: kern/165212: [ath] No WiFi on Acer Aspire One 751h (Atheros
 AR5BHB63 & AR5B95)
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> can you attach this to the PR too?

OK.  I tried to attach the previous message, too, but I assume the
system was unhappy with the 180KB+ log file.

> There's no errors here, it's just not RX'ing anything.
> 
> Is there an rfkill switch/button? (ie, some button that
> enables/disables wifi?) It may be a function switch?

There is such a switch.  I have tried playing with it under FreeBSD,
and got nowhere.  I don't seem to have to touch it under Ubuntu (or
maybe I only had to use it once).

>  Have you loaded
> the relevant ACPI module for your laptop (which sometimes maps the
> rfkill line to ACPI somehow, I don't know the real details.)

Other than having FreeBSD try to use ACPI, I don't know anything about this.
This appears in the boot log, and might be relevant:

Feb 20 16:11:25 halfpint kernel: acpi0: <ACRSYS ACRPRDCT> on motherboard
Feb 20 16:11:25 halfpint kernel: ACPI Error: Could not enable PowerButton event (20120215/evxfevnt-217)
Feb 20 16:11:25 halfpint kernel: ACPI Warning: Could not enable fixed event 0x2 (20120215/evxface-575)
Feb 20 16:11:25 halfpint kernel: acpi0: Power Button (fixed)
Feb 20 16:11:25 halfpint kernel: acpi0: reservation of 3f800000, 70800000 (3) failed
Feb 20 16:11:25 halfpint kernel: cpu0: <ACPI CPU> on acpi0
Feb 20 16:11:25 halfpint kernel: cpu1: <ACPI CPU> on acpi0

How do I find out if there is an ACPI module available, and if so, how to load
and enable it?  When I got this netbook it had a dead hard disk (i.e. no software),
and no useful documentation.  I have downloaded the available user and quick start
guides from Acer but I don't see much useful info.