linux-kernel - Re: [b43] usb device disconnects automatically after 1s

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Message-ID: <20110402184450.2ef19d7b@mdontu-dell>
Date:	Sat, 2 Apr 2011 18:44:50 +0300
From:	Mihai Donțu <mihai.dontu@...il.com>
To:	"Joey Lee" <jlee@...ell.com>
Cc:	<zajec5@...il.com>, <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>, <linux-wireless@...r.kernel.org>,
	<platform-driver-x86@...r.kernel.org>
Subject: Re: [b43] usb device disconnects automatically after 1s

On Wed, 16 Mar 2011 19:11:31 -0600
"Joey Lee" <jlee@...ell.com> wrote:

> Add Cc. to platform driver guys.
> 
> 於 四，2011-03-17 於 01:06 +0200，Mihai Donțu 提到：
> > On Thursday 17 March 2011 00:35:02 Rafał Miłecki wrote:
> > > 2011/3/16 Mihai Donțu <mihai.dontu@...il.com>:
> > > > Added linux-usb and linux-wireless to CC.
> > > > 
> > > > On Thursday 17 March 2011 00:18:31 Mihai Donțu wrote:
> > > >> Hi,
> > > >> 
> > > >> I have just upgraded to 2.6.38 and discovered that I can't use
> > > >> my wireless device (BCM4312 802.11a/b/g). I press Fn + F2, the
> > > >> bluetooth led lights and after a second it turns off by
> > > >> itself. In dmesg I'm seeing the following:
> > > >> 
> > > >> [   88.167212] usb 1-2.2: new full speed USB device using
> > > >> ehci_hcd and address 5
> > > >> [   88.782330] usb 1-2.2: USB disconnect, address 5
> > > >> 
> > > >> I switched to 2.6.37 until I'll have some time to bisect this.
> > > >> In the mean time I have attached the output of lspci,
> > > >> interrupts and dmesg.
> > > 
> > > I suspect it's WMI related. What is your machine?
> > 
> > It's a Dell Latitude D520 but I can't find a link with full specs
> > (in English).
> > 
> > > Please check:
> > > https://bugzilla.kernel.org/show_bug.cgi?id=31002
> > > http://comments.gmane.org/gmane.linux.acpi.devel/49577
> > > 
> > > I can't help you more, I just noticed such a issue reported on
> > > ACPI ML, you have to dig into this yourself (or someone else may
> > > help you).
> > 
> > Thanks for the links. I'll see if I can get anywhere from there.

Today I had some time on my hands and decided to get this working.
Which I did. So the difference between 2.6.37 and 2.6.38 is that now I
have to invoke rfkill to enable my wireless device, because pressing
Fn + F2 toggles the hard and soft lock states of the device _but_ only
to 'yes'. Pressing the key combination again will only remove the hard
lock. On 2.6.37 it would remove both. For example:

On 2.6.37:
# rfkill list 0               # wifi disabled
0: dell-wifi: Wireless LAN
        Soft blocked: yes
        Hard blocked: yes

# rfkill list 0               # wifi enabled (via Fn + F2)
0: dell-wifi: Wireless LAN
        Soft blocked: no
        Hard blocked: no

(rfkill events)
1301758599.537508: idx 0 type 1 op 2 soft 0 hard 0
1301758600.561087: idx 2 type 1 op 2 soft 0 hard 0

On 2.6.38:
# rfkill list 0               # wifi disabled
0: dell-wifi: Wireless LAN
        Soft blocked: yes
        Hard blocked: yes

# rfkill list 0               # wifi enabled (via Fn + F2)
0: dell-wifi: Wireless LAN
        Soft blocked: yes
        Hard blocked: no

(rfkill events)
1301758830.251541: idx 0 type 1 op 2 soft 1 hard 0

Is there supposed to be a piece of software that listens for these
events and toggles the soft state whenever the hard state changes?

Thanks,

-- 
Mihai Donțu
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