Reading back I see I haven't really done all I should, but a complete commit bisect may well be beyond the limits of my knowledge and time. On the other hand: last weekend I received an update to kernel 4.4.0 and that does seem to solve the issue. I can now suspend/resume on 4.4.0-31-generic as well as on 4.6.4 from mainline.
cheers Tom -- 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/1595935 Title: Suspend not working on Ubuntu 16.04 Status in linux package in Ubuntu: Incomplete Bug description: Suspend stopped working after upgrade from 15.10 to 16.04. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-24-generic 4.4.0-24.43 ProcVersionSignature: Ubuntu 4.4.0-24.43-generic 4.4.10 Uname: Linux 4.4.0-24-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: thomas 2349 F.... pulseaudio Date: Fri Jun 24 13:32:38 2016 HibernationDevice: RESUME=UUID=d2b33e2c-e0ac-4439-8484-3c684ac09f84 InstallationDate: Installed on 2014-06-24 (730 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417) MachineType: Dell Inc. Latitude 3540 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-24-generic.efi.signed root=UUID=6f195f6e-f9f2-4c1a-bc96-3bf4a5516379 ro quiet splash vt.handoff=7 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-4.4.0-24-generic N/A linux-backports-modules-4.4.0-24-generic N/A linux-firmware 1.157.1 SourcePackage: linux UpgradeStatus: Upgraded to xenial on 2016-04-26 (58 days ago) dmi.bios.date: 04/17/2014 dmi.bios.vendor: Dell Inc. dmi.bios.version: A06 dmi.board.name: 02RKKX dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 8 dmi.chassis.vendor: Dell Inc. dmi.chassis.version: A06 dmi.modalias: dmi:bvnDellInc.:bvrA06:bd04/17/2014:svnDellInc.:pnLatitude3540:pvrA06:rvnDellInc.:rn02RKKX:rvrA00:cvnDellInc.:ct8:cvrA06: dmi.product.name: Latitude 3540 dmi.product.version: A06 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1595935/+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