I found that if you downgrade the modemmanager the UML295 indeed works as it should. However, it breaks my Sierra Wireless 340U. If you use a recent modem manager the 340U works but it breaks the UML295. Know that I am dual booting with Win10 and Ubuntu.
I have a workaround. It seems that the initiation sequence takes a certain amount of time for the UML295 to complete properly. If you interrupt the boot process and let it sit you can allow the UML295 enough time to initiate and then it works. It doesn't take very long actually. When you enter GRUB the default choice gives you 15 second hold before booting. This is not long enough. If you drop down to the next choice "Advanced Options for Ubuntu" the timer is killed and it will sit in GRUB indefinitely. Now plug in the UML295. All you have to do is wait long enough for the UML295 to initiate and stick on. You know this has happened after it flashes green 3-4 times and then becomes green without flashing. Now you can proceed to boot Ubuntu and the UML295 will work fine. The caveat is that you cannot unplug it and plug it back in again but you don't really do that anyway so it is not a big problem. You can toggle it on and off in network manager without a problem. This works for my Lenovo and Toshiba notebooks. This did not work for my Asus notebooks but using the paradigm and being persistent I discovered that if you boot into the BIOS you also stop the boot process. Now you can plug in the UML295 and wait in the same way for it to initialize as above. Then you can exit BIOS without saving and continue into GRUB and boot in the usual way and it sticks. Humm... So I tried the BIOS trick and it did not work with the Lenovo. Go figure. The Toshiba has a different kind of BIOS forcing me to boot into the Win10 login screen and then exit from there into GRUB so can't say about that computer. In my mind's eye it is all about the initiate timing of the UML295 and how it interacts with the Ubuntu boot. It's hard for me to think that more than few lines of code would fix it if this problem has enough priority for someone to look at it. So now with the latest modem manager (good) my 340U just works and my UML295 works fine with a little dance when I boot. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1373116 Title: cdc_acm causes Pantech UML295 reset To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1373116/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
