cpu won't go past 2GHz even under heavy load

[Redmar]

I use this laptop for scientific analysis, so the performance loss is very noticeable. This happened suddenly, and does not appear to be related to a cooling problem. Obvious things like rebooting or manually setting the CPU governor to 'performance' don't resolve this.

Before, the CPU would go up to 3.2GHz, and the temperature would be pushing against 85C, which is 'high' for this CPU.
Now, the frequency only goes up to 2GHz, and the temperature stays at 60C

Please let me know if there is anything I can do to help resolve this issue, I really cannot afford the performance loss that comes with this problem, so I'm very motivated to help resolve this.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.16.0-67-generic 3.16.0-67.87~14.04.1
ProcVersionSignature: Ubuntu 3.16.0-67.87~14.04.1-generic 3.16.7-ckt24
Uname: Linux 3.16.0-67-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CurrentDesktop: Unity
Date: Tue Apr 12 21:38:49 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-06-29 (288 days ago)
InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64+mac (20150218.1)
SourcePackage: linux-lts-utopic
UpgradeStatus: No upgrade log present (probably fresh install)