I can also confirm it hangs in a live session. I also managed to get
strace output and roughly pinpoint the issues to a particular action.
When probing the serial devices MM tries to do the following with
various interfaces exported by the modem. In this case, ttyUSB0 isn't
the actual tty that will receive AT commands but is exported by the
modem:
open("/dev/ttyUSB0", O_RDWR|O_EXCL|O_NOCTTY|O_NONBLOCK) = 24
ioctl(24, TIOCEXCL, 0) = 0
ioctl(24, TCFLSH, 0x2) = 0
ioctl(24, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon -echo
...}) = 0
ioctl(24, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon -echo
...}) = 0
ioctl(24, SNDCTL_TMR_TIMEBASE or TCGETS, {B9600 -opost -isig -icanon -echo
...}) = 0
ioctl(24, SNDCTL_TMR_START or TCSETS, [***] {B57600 -opost -isig -icanon -echo
...}) = 0
Note that NM is stopped at the time (I need to stop is to restart NM and
trace it...), and nothing else was running.
What happens appears to be the following: if I'm just moving the mouse,
nothing special. There doesn't seem to be any lockup, things go along
fine until the modem is "ready".
At the point where MM gets to the open() call for ttyUSBx, in strace,
before the closing parens is added for that call, and I press a key on
my keyboard, the mouse stops moving and no characters are outputted to
the screen. Things appear to be locked for a few seconds (5-6 seconds by
my count).
Things unlock at the point where we get to the "ioctl(24,
SNDCTL_TMR_START or TCSETS" line where I added the "[***]" marker. The
characters I typed in (or at least some of them) appear on the screen
and the mouse pointer starts moving again.
I'm attaching the "full" strace output I got for reproducing one or two
occurrences of this issue.
>From what I can tell this relates roughly to the "tcgetattr (priv->fd,
&priv->old_t)" call at line 733 in src/mm-serial-port.c; but I'm nowhere
close to knowing whether it's an issue in MM or some part of the serial
stack (or even the devices). FWIW, the code I'm referencing is readable
at http://cgit.freedesktop.org/ModemManager/ModemManager/tree/src/mm-
serial-port.c .
** Attachment added: "mm-strace.txt"
https://bugs.launchpad.net/ubuntu/maverick/+source/network-manager/+bug/636091/+attachment/1826181/+files/mm-strace.txt
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/636091
Title:
Touchpad stops working when wifi/3G connects
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
