Public bug reported: According to bug 1193222, comment #13, I need to install powerd in order to get the screen to sleep on inactivity if I use Mir (the default for Saucy) as display manager.
But if I try to install powerd, modemmanager gets removed: till@till-twist:~$ sudo apt-get install powerd Reading package lists... Done Building dependency tree Reading state information... Done The following extra packages will be installed: libhardware2 libhybris libmedia1 libubuntu-application-api1 ofono The following packages will be REMOVED: modemmanager The following NEW packages will be installed: libhardware2 libhybris libmedia1 libubuntu-application-api1 ofono powerd 0 upgraded, 6 newly installed, 1 to remove and 0 not upgraded. Need to get 854 kB of archives. After this operation, 1.237 kB of additional disk space will be used. Do you want to continue [Y/n]? n Abort. till@till-twist:~$ This means that I can either have the feature of the screen going to sleep or cellular data support, not both. ** Affects: powerd (Ubuntu) Importance: Critical Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1231818 Title: Installing powerd removes modemmanager To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/powerd/+bug/1231818/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs