It doesn't use this much cpu while running the actual login screen. It uses 100% after log in. output of top:
top - 18:24:41 up 5 min, 1 user, load average: 1.70, 1.43, 0.63 Tasks: 161 total, 1 running, 160 sleeping, 0 stopped, 0 zombie Cpu(s): 29.6%us, 22.9%sy, 0.0%ni, 47.0%id, 0.3%wa, 0.0%hi, 0.2%si, 0.0%st Mem: 6126892k total, 2435856k used, 3691036k free, 118940k buffers Swap: 5960076k total, 0k used, 5960076k free, 469336k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1017 root 20 0 369m 4832 3624 S 100 0.1 3:37.86 lightdm -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/838208 Title: lightdm uses 100% cpu after login, all the time To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/838208/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs