Re: Ericsson F3507g cdc_acm broken with 2.6.30

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On Tue, Jun 16, 2009 at 12:42:27AM +0200, Josip Rodin wrote:
> On Tue, Jun 16, 2009 at 12:34:46AM +0200, Josip Rodin wrote:
> > > > > I have an integrated wireless setup inside my Lenovo Thinkpad T400 which
> > > > > normally works fine and provides WiFi, Bluetooth and WWAN connectivity.
> > > > > The wifi card is utilized by the iwlagn driver, and WWAN modem appears
> > > > > as cdc_acm device.
> > > > > 
> > > > > I upgraded from 2.6.28.10 to 2.6.30 and that went well as far as iwlagn
> > > > > was concerned, however, I noticed that the WWAN function is broken - the
> > > > > ttyACM* devices silently disappeared and won't come back - even lsusb
> > > > > doesn't show the Ericsson F3507g device any more!
> > > > > 
> > > > > Is this a known problem, or do I need to bisect it?
> > > > 
> > > > It's not a known problem, and yours is not the only report of this.
> > > > 
> > > > Could you bisect it to help us resolve it?
> > > 
> > > I just did a first poor man's bisection - downgrading one notch down to
> > > 2.6.29.5 - it doesn't change things, so the problem's in there somewhere.
> > > 
> > > Which subdirectory do I use for git bisection, just drivers/net/usb or
> > > the whole drivers/usb/ or?
> > 
> > While git was cloning, I remembered to do a google search with 2.6.29 (my
> > previous attempt was with 2.6.30 and that didn't give me anything), and that
> > provided a very useful answer:
> > 
> > http://www.nabble.com/Cannot-get-Ericsson-F3507G-to-work-with-the-Option-module-tt21993695.html#a21995246
> > 
> > So I thought - let me check that wwan_enable thing on 2.6.30:
> > 
> > % cat /sys/devices/platform/thinkpad_acpi/wwan_enable
> > 0
> > thinkpad_acpi: deprecated sysfs attribute: access by process with PID 2968
> > thinkpad_acpi: WARNING: sysfs attribute wwan_enable is deprecated and will be removed. Please switch to generic rfkill before year 2010
> > % sudo sh -c 'echo 1 > /sys/devices/platform/thinkpad_acpi/wwan_enable'
> > thinkpad_acpi: deprecated sysfs attribute: access by process with PID 2968
> > thinkpad_acpi: WARNING: sysfs attribute wwan_enable is deprecated and will be removed. Please switch to generic rfkill before year 2010
> > usb 8-4: new high speed USB device using ehci_hcd and address 4
> > usb 8-4: configuration #1 chosen from 2 choices
> > cdc_acm 8-4:1.1: ttyACM0: USB ACM device
> > cdc_acm 8-4:1.3: ttyACM1: USB ACM device
> > cdc_wdm 8-4:1.5: cdc-wdm0: USB WDM device
> > cdc_wdm 8-4:1.6: cdc-wdm1: USB WDM device
> > usb0: register 'cdc_ether' at usb-0000:00:1d.7-4, CDC Ethernet Device, 02:80:37:ec:02:00
> > cdc_acm 8-4:1.9: ttyACM2: USB ACM device
> > 
> > Yay. Now I see that I've been looking at a different scenario - while
> > upgrading to 2.6.30, I noticed that iwlagn has RFKILL support, and enabled
> > it. I definitely tested it at one point - maybe that tripped off the
> > problematic situation. So now I tried using the little physical switch,
> > on and off again, and everything seems fine. I'll try it again after a
> > reboot, in a minute.
> 
> Oddly enough, it works fine after a reboot - the wwan_enable is still set
> to 1.
> 
> So it looks like the remaining problem is that something somewhere seems
> to have set that option in a way that disabled the hardware, but nothing
> tells the user that there is a problem. Can this be fixed?

I really have no idea, it doesn't sound like a USB problem, but a
platform issue :(

sorry,

greg k-h
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