Public bug reported:
Kubuntu version information: just upgraded to 9.04 from 8.04.
USB device in question is "Siemens ES75" modem; cannot lsusb yet as I'm
currently under 2.6.28-11 and by mistake left the modem connected while
booting.
Under 2.6.24-{19, 21, 22, 23}-generic:
===========================
1. Connect usb modem
2. dmesg shows new device, loads cdc_acm module, appears as /dev/ttyACM0
3. On disconnect* modem is disconnected, /dev/ttyACM0 cleaned up
4. Modem can be reconnected
* = modem can even be disconnected by causing it to restart. If the
device is closed accordingly it'll get reattached with same device name.
If /dev/ttyACM0 is left open while restarting the modem upon
reconnecting it will get assigned next ttyACM -device, for example
/dev/ttyACM1.
<I'll edit here the uname -r and /proc/version_signature>
Under 2.6.28-11-generic:
===========================
1. Connect usb modem (before booting)
2. Most likely will fail before cdc_acm could be loaded: (this is also in
attachment dmesg-2.6.28-11.log)
[ 589.600044] usb 4-1: new full speed USB device using uhci_hcd and address 10
[ 589.720036] usb 4-1: device descriptor read/64, error -71
[ 589.944039] usb 4-1: device descriptor read/64, error -71
[ 590.160075] usb 4-1: new full speed USB device using uhci_hcd and address 11
[ 590.280031] usb 4-1: device descriptor read/64, error -71
[ 590.505027] usb 4-1: device descriptor read/64, error -71
[ 590.720037] usb 4-1: new full speed USB device using uhci_hcd and address 12
[ 591.128025] usb 4-1: device not accepting address 12, error -71
[ 591.240049] usb 4-1: new full speed USB device using uhci_hcd and address 13
[ 591.648047] usb 4-1: device not accepting address 13, error -71
[ 591.648059] hub 4-0:1.0: unable to enumerate USB device on port 1
3. Any reconnection attempts** will fail with the messages above
** = I've tried several different usb-cables in addition to the ones
working under 2.6.24's.
$ uname -a
Linux joonas-pc 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17 01:57:59 UTC 2009
i686 GNU/Linux
$ cat /proc/version_signature
Ubuntu 2.6.28-11.42-generic
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
--
USB regression from 2.6.24-23-generic with USB GSM-modem
https://bugs.launchpad.net/bugs/369190
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