linux-kernel - Re: [PATCH 0/8] [Resend] ideapad: using EC command to control rf/camera power

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Date:	Thu, 9 Sep 2010 20:17:15 +0200
From:	"Mario 'BitKoenig' Holbe" <Mario.Holbe@...Ilmenau.DE>
To:	Ike Panhc <ike.pan@...onical.com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	"platform-driver-x86@...r.kernel.org" 
	<platform-driver-x86@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Thomas Renninger <trenn@...e.de>,
	Alan Cox <alan@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Corentin Chary <corentincj@...aif.net>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	"Brown, Len" <len.brown@...el.com>,
	Matthew Garrett <mjg@...hat.com>
Subject: Re: [PATCH 0/8] [Resend] ideapad: using EC command to control
 rf/camera power

On Fri, Sep 03, 2010 at 05:06:09PM +0800, Ike Panhc wrote:
> I look at the DSDT again and again but unfortunately can not find anything
> may cause the bluetooth device initial failed. BTEN looks like the switch
> for EC to turn on/off bluetooth, BTST records the status of BTEN and BTPS
> means bluetooth present. But no idea why initial failed after BTEN=1

Is there some way to trace ACPI calls under Windows (XP Home)?
I could then have a look at what happens when I Fn-F5 BT off.

> So I fall back to your suggestion. Have a module parameter to tell module
> not to register rfkill for bluetooth.
> I prepare the driver and please spend some time testing. Driver is at
> http://kernel.ubuntu.com/git?p=ikepanhc/ideapad-laptop.git;a=blob;f=drivers/platform/x86/ideapad-laptop.c;h=c4cf46a363f3f72d6db5339ec326d282d7e58183;hb=26a58948693b7d25960299a8025e569e68f28937
> and you may use "insmod ideapad-laptop.ko no_bt_rfkill=1" for your S12.

Hmmm, with this version and no_bt_rfkill=1 I run into the same problem
as without the ideapad module: If I switch BT off in Windows and reboot
to Linux, the device remains invisible and I have no chance to switch it
back on again :/
I guess this is because the initial device activation does currently
only happen in ideapad_register_rfkill() via rfkill_init_sw_state()
which is not called if no_bt_rfkill=1.
A manual call to ideapad_rfk_set() (or ideapad_sync_rfk_state()?) in the
no_bt_rfkill=1 case would very likely solve this, but I don't know how
to provide this call with the correct arguments.


regards
   Mario
-- 
... aber nur deshalb blueht Autoritaet, weil die meisten Menschen
Feiglinge und manche Menschen Diebe sind.
                                              -- Robert A. Wilson

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