BUG: unable to handle kernel NULL pointer dereference at 000000000000005c

System working fine until latest update

ProblemType: KernelOops
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-7-generic 4.4.0-7.22
ProcVersionSignature: Ubuntu 4.4.0-7.22-generic 4.4.2
Uname: Linux 4.4.0-7-generic x86_64
Annotation: Your system might become unstable now and might need to be restarted.
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: whb 1779 F.... pulseaudio
 /dev/snd/controlC0: whb 1779 F.... pulseaudio
Date: Tue Feb 23 10:21:11 2016
DuplicateSignature: BUG: unable to handle kernel NULL pointer dereference at location RIP: 0010:location location radeon_pm_set_clocks+0x270/0x590 [radeon]
Failure: oops
HibernationDevice: RESUME=UUID=9d2bcb15-ad11-46ff-92b5-9f8ecdc94132
InstallationDate: Installed on 2016-01-10 (44 days ago)
InstallationMedia: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160103)
IwConfig:
 enp4s0 no wireless extensions.

 lo no wireless extensions.
MachineType: Dell Inc. Precision WorkStation T3400
ProcFB:

ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-7-generic root=UUID=bfefefbf-f125-46ce-845b-22a16f9d3520 ro recovery nomodeset
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions: kerneloops-daemon 0.12+git20090217-3ubuntu9
RfKill:

SourcePackage: linux
Title: BUG: unable to handle kernel NULL pointer dereference at 000000000000005c
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/30/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A14
dmi.board.name: 0TP412
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 7
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA14:bd04/30/2012:svnDellInc.:pnPrecisionWorkStationT3400:pvr:rvnDellInc.:rn0TP412:rvr:cvnDellInc.:ct7:cvr:
dmi.product.name: Precision WorkStation T3400
dmi.sys.vendor: Dell Inc.