The network-manager + network-manager-gnome hypothesis may not be true.
I encountered this problem with Kubuntu 10.10, which doesn't have the
network-manager-gnome package installed. LiveCD test is enough.
How I did the test:
strace cat /dev/ttyUSB0
When it doesn't work, it gets stuck at:
open("/dev/ttyUSB0", O_RDONLY|O_LARGEFILE)
When it works, it will go all the way to a "read" operation.
Unloading usbserial and the corresponding modules that depend on it, and
then loading them back, fixes the issue until reboot.
Tested with Kubuntu 10.10 LiveCD and desktop install on HDD. Tested with
Ubuntu 10.10 LiveCD. Tested with Ubuntu 11.04 alpha1 LiveCD. All of them
gave the same experience as described above. I tested on 4 machines: two
desktops, two laptops, very different hardware between them. I tested
with three different USB serial adapters, each using a distinct kernel
driver (pl2303, cp210x, ch341), all with the same result.
I didn't try getting rid of the network-manager package completely
though. I'll give that a try, and if it fixes the issue, someone needs a
beating, since I was about to start debugging the kernel :)
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https://bugs.launchpad.net/bugs/700316
Title:
usbserial stopped working during a recent upgrade, no serial line via
usb anymore
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