Yes, I still have it. Constantly for example during bus rides to work. Also happens stationary, bad network signal quality seems to be affecting this. I think that also that if network utilization is high, the device is more likely to stay visible to the operating system and work ok. I don't know if Windows has this bug. It is however highly frustrating in Linux and rendering the device unusable for some. I have considered buying an alternative card to see if it performed better.
This happens in Kubuntu 12.04 LTS with kernel 3.2.0-31-generic #50-Ubuntu SMP Fri Sep 7 16:16:45 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux This is what happens in dmesg when device (and network) disconnects: [80790.192547] usb 1-5: USB disconnect, device number 39 [80790.193168] qcserial ttyUSB0: Qualcomm USB modem converter now disconnected from ttyUSB0 [80790.193230] qcserial 1-5:1.1: device disconnected [80790.200470] qcserial ttyUSB1: Qualcomm USB modem converter now disconnected from ttyUSB1 [80790.200500] qcserial 1-5:1.2: device disconnected [80790.200739] qcserial ttyUSB2: Qualcomm USB modem converter now disconnected from ttyUSB2 [80790.200775] qcserial 1-5:1.3: device disconnected And this happens when the device comes back: [80790.496243] usb 1-5: new high-speed USB device number 40 using ehci_hcd [80790.631018] usb 1-5: config 1 has an invalid interface number: 1 but max is 0 [80790.631034] usb 1-5: config 1 has no interface number 0 [80790.636336] qcserial 1-5:1.1: Qualcomm USB modem converter detected [80790.636876] usb 1-5: Qualcomm USB modem converter now attached to ttyUSB0 [80793.985067] usb 1-5: USB disconnect, device number 40 [80793.996588] qcserial ttyUSB0: Qualcomm USB modem converter now disconnected from ttyUSB0 [80793.996658] qcserial 1-5:1.1: device disconnected [80794.776509] usb 1-5: new high-speed USB device number 41 using ehci_hcd [80794.920269] qcserial 1-5:1.1: Qualcomm USB modem converter detected [80794.920932] usb 1-5: Qualcomm USB modem converter now attached to ttyUSB0 [80794.922823] qcserial 1-5:1.2: Qualcomm USB modem converter detected [80794.923284] usb 1-5: Qualcomm USB modem converter now attached to ttyUSB1 [80794.924829] qcserial 1-5:1.3: Qualcomm USB modem converter detected [80794.925271] usb 1-5: Qualcomm USB modem converter now attached to ttyUSB2 Sometimes the device does come back onlne and sometimes it doesn't. I fix this by rmmod qcseril ; modprobe qcserial . If the module is in use, I just restart network-manager daemon, then reload the module. TL;DR: The problem still exists in Kubuntu 12.04 LTS and kernel 3.2.0-31-generic. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/789508 Title: Seems like the Kernel is triggering a "pppd[1725]: Modem hangup" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/789508/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
