The same issue occurs when the laptop is installed with Windows 7. I think that it is not related with SO but with some BIOS "feature".
This laptop requires its own AC unit with 130W. If you use a lower power supply (but DELL also), the CPU performanc goes bellow 800Mgh. But... I suspect a bug on this routine becasue time to time, after resuming the laptop... I have found that the CPU speed is not recovered. To solve it, I unplug the power supply and plug again. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1260112 Title: [Dell Latitude E6540] CPU stuck on minimum frequency after resume from suspend and unplugged To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1260112/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
