Nicholas Westlake, thank you for reporting this and helping make Ubuntu better.
As per http://www.dell.com/support/home/us/en/19/product- support/product/poweredge-r720/drivers?os=naa an update to your computer's buggy, insecure, and outdated BIOS is available (2.5.4). If you update to this following https://help.ubuntu.com/community/BIOSUpdate does it change anything? For more on BIOS updates and linux, please see https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette . Please note your current BIOS is already in the Bug Description, so posting this on the old BIOS would not be helpful. Also, you don't have to create a new bug report. Once the BIOS is updated, if the problem is still reproducible: 1) Please provide the output of the following terminal command (not perform an apport-collect): sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date 2) Please make a comment specifically advising on if there was an improvement or not. 3) Please mark this report Status Confirmed. If it's not reproducible, please mark this as Invalid. Thank you for your understanding. ** Tags added: bios-outdated-2.5.4 ** Changed in: linux (Ubuntu) Importance: Undecided => Low ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1554279 Title: Times advances twice as fast with refined-jiffies Status in linux package in Ubuntu: Incomplete Bug description: When the clocksource is set to "refined-jiffies" it ticks twice as fast. This is not an issue when it is changed to "tsc". The problem existed in earlier kernels too. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-76-generic 3.13.0-76.120 ProcVersionSignature: Ubuntu 3.13.0-76.120-generic 3.13.11-ckt30 Uname: Linux 3.13.0-76-generic x86_64 NonfreeKernelModules: nvidia AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Feb 24 12:48 seq crw-rw---- 1 root audio 116, 33 Feb 24 12:48 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CRDA: Error: [Errno 2] No such file or directory: 'iw' Date: Tue Mar 8 00:47:45 2016 HibernationDevice: RESUME=UUID=96b67b5e-eb31-44ac-881d-56edc3d7910d InstallationDate: Installed on 2014-05-16 (661 days ago) InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2) MachineType: Dell Inc. PowerEdge R720 PciMultimedia: ProcEnviron: LANGUAGE=en_GB:en TERM=xterm PATH=(custom, no user) LANG=en_GB.UTF-8 SHELL=/bin/bash ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-76-generic.efi.signed root=UUID=9740a566-6efd-4b42-a82e-26e3cf6a76aa ro acpi=off nomdmonddf nomdmonisw PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-3.13.0-76-generic N/A linux-backports-modules-3.13.0-76-generic N/A linux-firmware 1.127.20 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/16/2014 dmi.bios.vendor: Dell Inc. dmi.bios.version: 2.2.2 dmi.board.name: 0X3D66 dmi.board.vendor: Dell Inc. dmi.board.version: A01 dmi.chassis.type: 23 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr2.2.2:bd01/16/2014:svnDellInc.:pnPowerEdgeR720:pvr:rvnDellInc.:rn0X3D66:rvrA01:cvnDellInc.:ct23:cvr: dmi.product.name: PowerEdge R720 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1554279/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp