Vincent, i am also tracking a similar bug (if not the same one). I too have been testing the latest upstream kernels as instructed. They all seem to have the same bug for me. My problems started after upgrading from 14.04 as well. Using my grub2 boot menu to select the oldest kernel i have seems to have no problems, but all the more recent ones do. Not sure if you will have the same results, but worth a try.
This is my bug: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1575467 -- 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/1562618 Title: whole OS freezes seemingly randomly Status in linux package in Ubuntu: Incomplete Bug description: I had some random freezes of the whole operating system. No caps lock response or terminal switching, nothng. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-15-generic 4.4.0-15.31 ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6 Uname: Linux 4.4.0-15-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.20-0ubuntu3 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: vincent 1714 F.... pulseaudio CurrentDesktop: Unity Date: Sun Mar 27 23:46:02 2016 HibernationDevice: RESUME=UUID=8180a7b6-a1c0-494a-9f65-99a7b54f6deb InstallationDate: Installed on 2015-11-01 (147 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) MachineType: LENOVO 20332 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-15-generic.efi.signed root=UUID=44fb018f-3dbd-4eb6-ab9a-6668de8d13d2 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-15-generic N/A linux-backports-modules-4.4.0-15-generic N/A linux-firmware 1.157 SourcePackage: linux UpgradeStatus: Upgraded to xenial on 2016-03-25 (2 days ago) dmi.bios.date: 12/26/2013 dmi.bios.vendor: LENOVO dmi.bios.version: 92CN26WW(V1.06) dmi.board.asset.tag: NO Asset Tag dmi.board.name: AIUU1 dmi.board.vendor: LENOVO dmi.board.version: 31900042STD dmi.chassis.asset.tag: NO Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Lenovo Yoga 2 11 dmi.modalias: dmi:bvnLENOVO:bvr92CN26WW(V1.06):bd12/26/2013:svnLENOVO:pn20332:pvrLenovoYoga211:rvnLENOVO:rnAIUU1:rvr31900042STD:cvnLENOVO:ct10:cvrLenovoYoga211: dmi.product.name: 20332 dmi.product.version: Lenovo Yoga 2 11 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1562618/+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