2011/6/14 <pera...@portugalmail.pt>: > I had a similar problem several weeks ago and it turned out all I had to do > was > upgrade the kernel. Below is the reply from the list to resolve my problem.
$ uname -a Linux tk 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux Hi Perazim, probably the issue doesn't depend on a kernel bug - at least not the one Dan provided the fix for, as 2.6.38 should have the patch applied now. > > Perazim > > On Thu, 2011-05-12 at 21:29 +0100, pera...@portugalmail.pt wrote: >> >> Dan, >> >> Attached are the messages log and the modem-manager log for the Alcatel >> X220. >> >> Let me know if you need any other info or to test anything. > > These logs indicate a kernel bug, with a 30 second hang when closing a > serial port. I submitted a patch to the kernel to fix this issue which > was accepted for the 2.6.37 kernel: > > commit 02303f73373aa1da19dbec510ec5a4e2576f9610 > Author: Dan Williams <d...@redhat.com> > Date: Fri Nov 19 16:04:00 2010 -0600 > > usb-wwan: implement TIOCGSERIAL and TIOCSSERIAL to avoid blocking > close(2) > > Some devices (ex ZTE 2726) simply don't respond at all when data is sent > to some of their USB interfaces. The data gets stuck in the TTYs queue > and sits there until close(2), which them blocks because closing_wait > defaults to 30 seconds (even though the fd is O_NONBLOCK). This is > rarely desired. Implement the standard mechanism to adjust closing_wait > and let applications handle it how they want to. > > Signed-off-by: Dan Williams <d...@redhat.com> > > and the ModemManager snapshot you have should have the support necessary > here. What kernel version are you running? > > Dan > > _______________________________________________ > networkmanager-list mailing list > networkmanager-list@gnome.org > http://mail.gnome.org/mailman/listinfo/networkmanager-list > _______________________________________________ networkmanager-list mailing list networkmanager-list@gnome.org http://mail.gnome.org/mailman/listinfo/networkmanager-list