~/ uname -a
Linux kwinz-laptop 2.6.31-9-generic #29-Ubuntu SMP Sun Aug 30 17:39:26 UTC 2009 
x86_64 GNU/Linux

First
~/ wvdial 3G
works (3G is my wvdial script)

then I do a 
~/ /etc/acpi/sleep.sh sleep

and wake up again

~/ wvdial 3G
--> WvDial: Internet dialer version 1.60
--> Cannot open /dev/ttyACM1: No such file or directory
--> Cannot open /dev/ttyACM1: No such file or directory
--> Cannot open /dev/ttyACM1: No such file or directory

then i tried
echo 1 > /sys/devices/platform/thinkpad_acpi/wwan_enable
/home/kwinz/ modprobe cdc_acm

now I get
~/ cat /dev/ttyACM*
cat: /dev/ttyACM0: No such device
cat: /dev/ttyACM1: Input/output error
cat: /dev/ttyACM2: Input/output error
cat: /dev/ttyACM3: Input/output error

and
~/ lsusb
Bus 002 Device 003: ID 0bdb:1900 Ericsson Business Mobile Networks BV

Please fellow Ubuntu victims, take this straight to
http://bugzilla.kernel.org so we might get a fix in the next kernel
release.

-- 
regression -  Ericsson F3507g (e.g. 0bdb:1900) WWAN Card not detected after 
2.6.27-10 kernel
https://bugs.launchpad.net/bugs/334413
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