udev-204-5ubuntu20.10 breakes usb_modeswitch

[Ilya Kotov]

usb_modeswitch doesn't work after upgrade from udev-204-5ubuntu20.9 to udev-204-5ubuntu20.10. Downgrading to udev-204-5ubuntu20.9 solves the problem.

Kernel:
Linux localhost 3.13.0-45-generic #74-Ubuntu SMP Tue Jan 13 19:37:48 UTC 2015 i686 i686 i686 GNU/Linux

[Ilya Kotov (forkotov02)]

usb modem: huawei E171

[Martin Pitt (pitti)]

https://launchpad.net/ubuntu/+source/systemd/204-5ubuntu20.10 adjusted the udev rules to prove some more drivers, perhaps one got in the way for you. Can you please install ubuntu20.9 (the old, working udev), activate the modem, do

  lsmod > ~/modules.old
  dmesg > ~/dmesg.old

. Then upgrade to current udev (i. e. ubuntu20.10), try to activate the modem (i. e. you get a failure), then do

  lsmog > ~/modules.new
  dmesg > ~/dmesg.new

and attach modules.old, dmesg.old, modules.new, dmesg.new here? Thanks!

[Martin Pitt (pitti)]

There has been no answer to the request for information above for a month. I'm closing this bug report as in its current form it is not actionable. I'll reopen this once that information has been provided. Thank you for your report!

[ramakrishna (ramakrishna-n)]

usb-modeswitch 2.2.1 is not supported by udev (204-5ubuntu20.10) few dongles from huawei {model : EC159} and some other.

By downgrading to udev {204-5ubuntu20.9} its working with those dongles.

Kernel version used : 3.14.19
Ubuntu version : 14.04.2 LTS