Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.6 kernel[0]. If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc7-wily/ ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** 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/1579410 Title: Cannot suspend or hybernate HP ProLiant SE316M1R2 Status in linux package in Ubuntu: Incomplete Bug description: pm-suspend, pm-hybernate does not work on HP ProLiant SE316M1R2 system. I am not sure if hardware actually supports that though, but there is kernel crash (see syslog.txt attached with Call Trace) which maybe is the cause. Monitor goes off for few seconds but after that system resumes and works as before. Also, some interesting lines: May 7 20:58:23 tomashp-server kernel: [ 4374.025981] pci_legacy_suspend(): hpsa_suspend+0x0/0x10 [hpsa] returns -38 May 7 20:58:23 tomashp-server kernel: [ 4374.025986] dpm_run_callback(): pci_pm_freeze+0x0/0xe0 returns -38 May 7 20:58:23 tomashp-server kernel: [ 4374.025987] PM: Device 0000:06:00.0 failed to freeze async: error -38s2disks These lines also appears when using s2disk. s2ram gives: KMS graphics driver is in use, skipping quirks. s2ram_do: Invalid argument ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-generic 4.4.0.21.22 ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6 Uname: Linux 4.4.0-21-generic x86_64 ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: CurrentDesktop: XFCE Date: Sat May 7 20:55:52 2016 HibernationDevice: RESUME=UUID=2f75ed7f-85b4-4d1f-abd5-04d88f7c8be3 InstallationDate: Installed on 2015-10-12 (208 days ago) InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805) IwConfig: eth0 no wireless extensions. eth1 no wireless extensions. lo no wireless extensions. MachineType: HP ProLiant SE316M1R2 ProcFB: 0 radeondrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic root=UUID=4d4fc552-1b5c-42b8-8829-9249646d798c ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.4.0-21-generic N/A linux-backports-modules-4.4.0-21-generic N/A linux-firmware 1.157 RfKill: SourcePackage: linux UpgradeStatus: Upgraded to xenial on 2016-04-21 (15 days ago) dmi.bios.date: 07/02/2013 dmi.bios.vendor: HP dmi.bios.version: R02 dmi.chassis.type: 23 dmi.chassis.vendor: HP dmi.modalias: dmi:bvnHP:bvrR02:bd07/02/2013:svnHP:pnProLiantSE316M1R2:pvr:cvnHP:ct23:cvr: dmi.product.name: ProLiant SE316M1R2 dmi.sys.vendor: HP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1579410/+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