[TRANSIENT ISSUE] 3G-Modem not being recognised

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[TRANSIENT ISSUE] 3G-Modem not being recognised

Ajay Garg-2
Hi all.

I have been facing transient issues in getting the 3G-Modem recognised (via the appearence of the corresponding icon in the bottom-tray).

There really is no fixed pattern; sometimes the icon appears when the modem is inserted; sometimes not.
Same is the case when the XO is rebooted, while the modem is inserted. Upon booting, sometimes the icon appears; sometimes not.

I don't remember such issues in 12.1.0; there, the icon appeared whenever it ought to.


Is someone else too facing such transient issues; or am I the only one hit?



Regards,

Ajay Garg

Dextrose Developer
Activity Central: http://activitycentral.com

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Re: [TRANSIENT ISSUE] 3G-Modem not being recognised

James Cameron-2
I have heard from other people who have faced issues that may be
similar at root.

I suggest that you deepen your investigation to determine the reaction
of the kernel, and the ModemManager process, to the insertion of the
device.  Compare the reactions between working and non-working
scenarios.

On Tue, Nov 20, 2012 at 02:03:49PM +0530, Ajay Garg wrote:

> Hi all.
>
> I have been facing transient issues in getting the 3G-Modem recognised (via the
> appearence of the corresponding icon in the bottom-tray).
>
> There really is no fixed pattern; sometimes the icon appears when the modem is
> inserted; sometimes not.
> Same is the case when the XO is rebooted, while the modem is inserted. Upon
> booting, sometimes the icon appears; sometimes not.
>
> I don't remember such issues in 12.1.0; there, the icon appeared whenever it
> ought to.
>
>
> Is someone else too facing such transient issues; or am I the only one hit?
>
>
>
> Regards,
>
> Ajay Garg
> Dextrose Developer
> Activity Central: http://activitycentral.com

> _______________________________________________
> Devel mailing list
> [hidden email]
> http://lists.laptop.org/listinfo/devel


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RJV
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Re: [TRANSIENT ISSUE] 3G-Modem not being recognised

RJV
In reply to this post by Ajay Garg-2
Yes, Ajay, it does happen the way you describe so what I do is make sure that I have the device plugged in before starting the XO otherwise, you need to restart the XO for it to recognize the device or you need to switch desktop and upon returning back to Sugar, the device would be recognized.

Jv


On Tue, Nov 20, 2012 at 2:03 PM, Ajay Garg <[hidden email]> wrote:
Hi all.

I have been facing transient issues in getting the 3G-Modem recognised (via the appearence of the corresponding icon in the bottom-tray).

There really is no fixed pattern; sometimes the icon appears when the modem is inserted; sometimes not.
Same is the case when the XO is rebooted, while the modem is inserted. Upon booting, sometimes the icon appears; sometimes not.

I don't remember such issues in 12.1.0; there, the icon appeared whenever it ought to.


Is someone else too facing such transient issues; or am I the only one hit?



Regards,

Ajay Garg

Dextrose Developer
Activity Central: http://activitycentral.com

_______________________________________________
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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

Jerry Vonau-2
In reply to this post by Ajay Garg-2


On 20 November 2012 19:33, Ajay Garg <[hidden email]> wrote:
Hi all.

I have been facing transient issues in getting the 3G-Modem recognised (via the appearence of the corresponding icon in the bottom-tray).

There really is no fixed pattern; sometimes the icon appears when the modem is inserted; sometimes not.
Same is the case when the XO is rebooted, while the modem is inserted. Upon booting, sometimes the icon appears; sometimes not.


Think the appearance of the icon in the frame would depend on if the XO was in a suspended state when inserted, try tapping a key or the mouse to wake the XO up. I'm seeing my modem being continuously re-detected when resuming from a suspended state while tailing /var/log/messages,  I'd try disabling the power management in the control-panel to see if the situation improves.

Jerry
 
I don't remember such issues in 12.1.0; there, the icon appeared whenever it ought to.


Is someone else too facing such transient issues; or am I the only one hit?



Regards,

Ajay Garg

Dextrose Developer
Activity Central: http://activitycentral.com

_______________________________________________
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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

RJV
On the same topic, is anyone experienced with 3G connectivity on XO 1.5? Will it work? 3 G works fine with 1.75, 12.1, 0.96, Build 21. 

Regards,

Jv


On Tue, Nov 20, 2012 at 9:27 PM, Jerry Vonau <[hidden email]> wrote:


On 20 November 2012 19:33, Ajay Garg <[hidden email]> wrote:
Hi all.

I have been facing transient issues in getting the 3G-Modem recognised (via the appearence of the corresponding icon in the bottom-tray).

There really is no fixed pattern; sometimes the icon appears when the modem is inserted; sometimes not.
Same is the case when the XO is rebooted, while the modem is inserted. Upon booting, sometimes the icon appears; sometimes not.


Think the appearance of the icon in the frame would depend on if the XO was in a suspended state when inserted, try tapping a key or the mouse to wake the XO up. I'm seeing my modem being continuously re-detected when resuming from a suspended state while tailing /var/log/messages,  I'd try disabling the power management in the control-panel to see if the situation improves.

Jerry
 
I don't remember such issues in 12.1.0; there, the icon appeared whenever it ought to.


Is someone else too facing such transient issues; or am I the only one hit?



Regards,

Ajay Garg

Dextrose Developer
Activity Central: http://activitycentral.com

_______________________________________________
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http://lists.sugarlabs.org/listinfo/sugar-devel



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Re: [TRANSIENT ISSUE] 3G-Modem not being recognised

Martin Langhoff
In reply to this post by Ajay Garg-2
Ajay, folks,

please indicate OS version, XO model, steps to repro (even if
intermittent), and collect kernel logs so we can see WTH is going on.

Otherwise we can only say "maybe" and speculate -- good stuff for idle
converstation at a bar, but not productive if you want to see the
problem diagnosed and solved...

cheers,



martin

On Tue, Nov 20, 2012 at 3:33 AM, Ajay Garg <[hidden email]> wrote:

> Hi all.
>
> I have been facing transient issues in getting the 3G-Modem recognised (via
> the appearence of the corresponding icon in the bottom-tray).
>
> There really is no fixed pattern; sometimes the icon appears when the modem
> is inserted; sometimes not.
> Same is the case when the XO is rebooted, while the modem is inserted. Upon
> booting, sometimes the icon appears; sometimes not.
>
> I don't remember such issues in 12.1.0; there, the icon appeared whenever it
> ought to.
>
>
> Is someone else too facing such transient issues; or am I the only one hit?
>
>
>
> Regards,
>
> Ajay Garg
> Dextrose Developer
> Activity Central: http://activitycentral.com
>
> _______________________________________________
> Devel mailing list
> [hidden email]
> http://lists.laptop.org/listinfo/devel
>



--
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 - ask interesting questions
 - don't get distracted with shiny stuff  - working code first
 - http://wiki.laptop.org/go/User:Martinlanghoff
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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

Jerry Vonau-2


On 21 November 2012 14:59, Martin Langhoff <[hidden email]> wrote:
Ajay, folks,

please indicate OS version, XO model, steps to repro (even if
intermittent), and collect kernel logs so we can see WTH is going on.

Otherwise we can only say "maybe" and speculate -- good stuff for idle
converstation at a bar, but not productive if you want to see the
problem diagnosed and solved...

cheers,


Dropping the power to the usb bus is making the modem play peek-a-boo with the kernel: http://dev.laptop.org/ticket/10708.

Wondering if a flash-drive could become corrupt if the power was cut while writing to the external device.....

The olpc-au tracker moved revised urls referenced in 10708:
http://sugardextrose.org/issues/387
http://sugardextrose.org/issues/1029/

Still present in 13.1.0-12

Jerry
 



martin

On Tue, Nov 20, 2012 at 3:33 AM, Ajay Garg <[hidden email]> wrote:
> Hi all.
>
> I have been facing transient issues in getting the 3G-Modem recognised (via
> the appearence of the corresponding icon in the bottom-tray).
>
> There really is no fixed pattern; sometimes the icon appears when the modem
> is inserted; sometimes not.
> Same is the case when the XO is rebooted, while the modem is inserted. Upon
> booting, sometimes the icon appears; sometimes not.
>
> I don't remember such issues in 12.1.0; there, the icon appeared whenever it
> ought to.
>
>
> Is someone else too facing such transient issues; or am I the only one hit?
>
>
>
> Regards,
>
> Ajay Garg
> Dextrose Developer
> Activity Central: http://activitycentral.com
>
> _______________________________________________
> Devel mailing list
> [hidden email]
> http://lists.laptop.org/listinfo/devel
>



--
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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

James Cameron-2
On Wed, Nov 21, 2012 at 05:07:20PM +1100, Jerry Vonau wrote:
> Dropping the power to the usb bus is making the modem play peek-a-boo with the
> kernel: http://dev.laptop.org/ticket/10708.

Is that all it is?  How boring.  Nothing new.

Ajay, can you confirm your problem goes away if you turn off automatic
power management?

--
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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

Ajay Garg-2


On Wed, Nov 21, 2012 at 11:54 AM, James Cameron <[hidden email]> wrote:
On Wed, Nov 21, 2012 at 05:07:20PM +1100, Jerry Vonau wrote:
> Dropping the power to the usb bus is making the modem play peek-a-boo with the
> kernel: http://dev.laptop.org/ticket/10708.

Is that all it is?  How boring.  Nothing new.

Ajay, can you confirm your problem goes away if you turn off automatic
power management?


Martin, James :

I am downloading os12 for XO-1.75 so that I can update with the results on the latest image.
Please provide me about 5-6 hours (I have 56KBPS download-speed connection).



--
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http://quozl.linux.org.au/



Regards,

Ajay Garg

Dextrose Developer
Activity Central: http://activitycentral.com

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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

James Cameron-2
On Wed, Nov 21, 2012 at 12:01:07PM +0530, Ajay Garg wrote:
> I am downloading os12 for XO-1.75 so that I can update with the
> results on the latest image.

That's nice.  Still, I'm interested if turning off automatic power
management solves the problem for you ... with the build you already
have.

> Please provide me about 5-6 hours (I have 56KBPS download-speed
> connection).

Good, additional justification for finding a way to make our build
files much smaller.  ;-}  It takes me a while too.

(I used to split a file in two pieces using a remote shell account and
download over two 56 kbps modems.  Now I use a 3 mbps HSPA service.)

--
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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

Jerry Vonau-2
In reply to this post by James Cameron-2


On 21 November 2012 17:24, James Cameron <[hidden email]> wrote:
On Wed, Nov 21, 2012 at 05:07:20PM +1100, Jerry Vonau wrote:
> Dropping the power to the usb bus is making the modem play peek-a-boo with the
> kernel: http://dev.laptop.org/ticket/10708.

Is that all it is?  How boring.  Nothing new.

Yawn, yup boring unless a sponsor of your deployment is a 3G service provider, then it becomes a major 'has to work out of the box' from  a business point of view. If it's as simple as adding a single entry to powerd's usb-inhibits file like how 'hid' is treated then why has this not been done? I don't think having an end-user with no experience with USB IDs add an entry to the usb-inhibits file, or having to remember to turn off a major feature is the correct long term solution IMHO.

just my thoughts,

Jerry
 

Ajay, can you confirm your problem goes away if you turn off automatic
power management?

--
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http://quozl.linux.org.au/


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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

James Cameron-2
On Wed, Nov 21, 2012 at 06:29:42PM +1100, Jerry Vonau wrote:
> Yawn, yup boring unless a sponsor of your deployment is a 3G service
> provider, then it becomes a major 'has to work out of the box' from
> a business point of view.

Perhaps this service provider can provide technical support?

> If it's as simple as adding a single entry to powerd's usb-inhibits
> file like how 'hid' is treated then why has this not been done?

My guess is priorities are elsewhere in the stack at the moment, and
we have very few deployments demanding this be fixed.

> I don't think having an end-user with no experience with USB IDs add
> an entry to the usb-inhibits file, or having to remember to turn off
> a major feature is the correct long term solution IMHO.

Certainly not.  I didn't think you or Ajay were end-users though.  My
advice to end-users would be to wait for the problem to be fixed, or
ask their deployment technical people to turn off the major feature
permanently, or build a fix.

--
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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

Martin Langhoff
On Wed, Nov 21, 2012 at 2:40 AM, James Cameron <[hidden email]> wrote:
>> I don't think having an end-user with no experience with USB IDs add
>> an entry to the usb-inhibits file, or having to remember to turn off
>> a major feature is the correct long term solution IMHO.

You guys are driving OOB, so you short-term you can tweak usb-inhibits
with the 3G modems you have. And you've hacked powerd and other bits
of infra in the past, if there's a better way (ie: is there a way to
block suspend when a class of USB device is plugged? or perhaps an NM
hook could set the inhibit-suspend flag?) you are uniquely well
positioned to know, try likely approaches, etc...

cheers,



m
--
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RE: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

Alan Jhonn Aguiar Schwyn
is there a way to block suspend when a class of USB device is plugged?

This will be very important.. Disable the "automatic power-save" (AKA power off usb..)
if one device is using the usb comunication. This can be made?
What happens if you want to copy a large file to a pendrive? The system power-off
the usb ever?

Alan


> From: [hidden email]

> Date: Wed, 21 Nov 2012 02:53:47 -0500
> To: [hidden email]; [hidden email]; [hidden email]; [hidden email]; [hidden email]; [hidden email]
> Subject: Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised
>
> On Wed, Nov 21, 2012 at 2:40 AM, James Cameron <[hidden email]> wrote:
> >> I don't think having an end-user with no experience with USB IDs add
> >> an entry to the usb-inhibits file, or having to remember to turn off
> >> a major feature is the correct long term solution IMHO.
>
> You guys are driving OOB, so you short-term you can tweak usb-inhibits
> with the 3G modems you have. And you've hacked powerd and other bits
> of infra in the past, if there's a better way (ie: is there a way to
> block suspend when a class of USB device is plugged? or perhaps an NM
> hook could set the inhibit-suspend flag?) you are uniquely well
> positioned to know, try likely approaches, etc...
>
> cheers,
>
>
>
> m
> --
> [hidden email]
> [hidden email] -- Software Architect - OLPC
> - ask interesting questions
> - don't get distracted with shiny stuff - working code first
> - http://wiki.laptop.org/go/User:Martinlanghoff
> _______________________________________________
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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

Martin Langhoff
On Wed, Nov 21, 2012 at 3:07 AM, Alan Jhonn Aguiar Schwyn
<[hidden email]> wrote:
>> is there a way to block suspend when a class of USB device is plugged?
>
> This will be very important.. Disable the "automatic power-save" (AKA power
> off usb..)

It is already done in many cases.

> if one device is using the usb comunication. This can be made?
> What happens if you want to copy a large file to a pendrive? The system
> power-off
> the usb ever?

In that case, we already do the right thing.

cheers,



m
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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

Richard A. Smith
In reply to this post by James Cameron-2
On 11/21/2012 02:40 AM, James Cameron wrote:

> Perhaps this service provider can provide technical support?
>
>> If it's as simple as adding a single entry to powerd's usb-inhibits
>> file like how 'hid' is treated then why has this not been done?
>
> My guess is priorities are elsewhere in the stack at the moment, and
> we have very few deployments demanding this be fixed.
>
>> I don't think having an end-user with no experience with USB IDs add
>> an entry to the usb-inhibits file, or having to remember to turn off
>> a major feature is the correct long term solution IMHO.
>
> Certainly not.  I didn't think you or Ajay were end-users though.  My
> advice to end-users would be to wait for the problem to be fixed, or
> ask their deployment technical people to turn off the major feature
> permanently, or build a fix.
>

In the previous thread this was discussed in  (See "Patch: Mobile
dongles") the proposal was that inhibit would be triggered by the
presence of module 'usb_wwan'.  Jerry submitted patches that did that.
Paul was wondering if there was a better way than looking for a module
loaded.

Powerd already has a mechanism where it disables suspend while an
association is in process and Paul was wondering if you could leverage
the existing infrastructure for this.

The thread dies after that.  So I think anyone wanting this to get
integrated as a stock feature should investigate if you can use a NM
hook to send the DBUS message to powerd to inhibit.

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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

Jerry Vonau-2
In reply to this post by James Cameron-2


On 21 November 2012 18:40, James Cameron <[hidden email]> wrote:
On Wed, Nov 21, 2012 at 06:29:42PM +1100, Jerry Vonau wrote:
> Yawn, yup boring unless a sponsor of your deployment is a 3G service
> provider, then it becomes a major 'has to work out of the box' from
> a business point of view.

Perhaps this service provider can provide technical support?


Not really, the 15 second cycle is just not enough time for usb-modeswitch to work it's magic and then have NetworkManager bring up the 3G interface. We could tailor adding the specific USB IDs for that provider's devices but the rest of the world still suffers. 
 
> If it's as simple as adding a single entry to powerd's usb-inhibits
> file like how 'hid' is treated then why has this not been done?

My guess is priorities are elsewhere in the stack at the moment, and
we have very few deployments demanding this be fixed.


I understand that part, lots of work, too few people.

 
> I don't think having an end-user with no experience with USB IDs add
> an entry to the usb-inhibits file, or having to remember to turn off
> a major feature is the correct long term solution IMHO.

Certainly not.  I didn't think you or Ajay were end-users though.  My
advice to end-users would be to wait for the problem to be fixed, or
ask their deployment technical people to turn off the major feature
permanently, or build a fix.


We did the last option, seemed the better compromise for all of our users.
 
Jerry

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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

Jerry Vonau-2
In reply to this post by Martin Langhoff


On 21 November 2012 18:53, Martin Langhoff <[hidden email]> wrote:
On Wed, Nov 21, 2012 at 2:40 AM, James Cameron <[hidden email]> wrote:
>> I don't think having an end-user with no experience with USB IDs add
>> an entry to the usb-inhibits file, or having to remember to turn off
>> a major feature is the correct long term solution IMHO.

You guys are driving OOB, so you short-term you can tweak usb-inhibits
with the 3G modems you have. And you've hacked powerd and other bits
of infra in the past, if there's a better way (ie: is there a way to
block suspend when a class of USB device is plugged? or perhaps an NM
hook could set the inhibit-suspend flag?) you are uniquely well
positioned to know, try likely approaches, etc...

I used a big hammer, I disabled suspending when the usb_wwan kernel module got loaded, but the disabling stays in place as the module never gets auto unloaded. The next time I need to fork powerd think I'll lockout suspend for one minute when usb_wwan gets loaded then rely on this patch[1] to handle to handle the rest.
I don't think dbus would react fast enough as modeswitching may need to be done before dbus could see the interface.

Jerry

1.  http://lists.laptop.org/pipermail/devel/2012-May/035213.html


 

cheers,



m
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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

Richard A. Smith
In reply to this post by Jerry Vonau-2
On 11/21/2012 01:07 AM, Jerry Vonau wrote:

>
> Dropping the power to the usb bus is making the modem play peek-a-boo
> with the kernel: http://dev.laptop.org/ticket/10708.
> <http://dev.laptop.org/ticket/10708>

And just to be clear its more than just a power dropping problem.  Both
1.75 and XO-4 both have the ability to keep the USB bus powered during
suspend (with an EC firmware change) but on resume the kernel resets the
USB bus.  I don't know if the kernel has an option not to do that.

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Re: [Sugar-devel] [TRANSIENT ISSUE] 3G-Modem not being recognised

Ajay Garg-2
Hi all.

I tested on os11, with all power-management disabled.

0.
Insert a pen-drive.

a)
Inserted modem in another slot; the modem is detected.

b)
Reboot.

c)
Modem is NOT detected.

d)
Remove modem.

e)
Insert modem;  the modem is detected.


I tried the above steps 5 times; and the results were same.


Also, please find attached a sample  python script, which lists all the detected network-devices.
When this script is run as "python nm_test.py" in step c), the modem-device is not detected by this script as well; whereas in other cases, this script  detects the device.







================================================================================

Another sequence ::


0.
Ensure that there is no pen-drive inserted in any of the USB slots.

a)
Inserted modem; the modem is detected.

b)
Reboot.

c)
Modem is detected.

d)
Remove modem.

e)
Insert modem;  the modem is detected.


I tried the above steps 5 times; and the results were same.


===============================================================================================


I will try the  same  steps with os12, once I am finished downloading it.


===============================================================================================


I don't have a XO-1.5; so can't try on it :-\






On Wed, Nov 21, 2012 at 3:18 PM, Richard A. Smith <[hidden email]> wrote:
On 11/21/2012 01:07 AM, Jerry Vonau wrote:


Dropping the power to the usb bus is making the modem play peek-a-boo
with the kernel: http://dev.laptop.org/ticket/10708.
<http://dev.laptop.org/ticket/10708>

And just to be clear its more than just a power dropping problem.  Both 1.75 and XO-4 both have the ability to keep the USB bus powered during suspend (with an EC firmware change) but on resume the kernel resets the USB bus.  I don't know if the kernel has an option not to do that.


--
Richard A. Smith  <[hidden email]>
One Laptop per Child
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Regards,
Ajay


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