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

[Ajay Garg]

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 <richard at laptop.org>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>
>> .
>> <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  <richard at laptop.org>
> One Laptop per Child
> ______________________________**_________________
> Devel mailing list
> Devel at lists.laptop.org
> http://lists.laptop.org/**listinfo/devel<http://lists.laptop.org/listinfo/devel>
>


Regards,
Ajay
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