Not sure it is related to actual freezing incidents, but I saw this in kernel log at suspend:
Apr 2 09:46:26 lhs kernel: [ 305.963399] ------------[ cut here ]------------ Apr 2 09:46:26 lhs kernel: [ 305.963436] WARNING: CPU: 2 PID: 2892 at /build/buildd/linux-3.13.0/drivers/gpu/drm/i915/intel_uncore.c:125 gen6_gt_check_fifodbg.isra.9+0x38/0x50 [i915]() Apr 2 09:46:26 lhs kernel: [ 305.963437] MMIO read or write has been dropped ffffffff Apr 2 09:46:26 lhs kernel: [ 305.963488] Modules linked in: ctr ccm snd_hda_codec_hdmi snd_hda_codec_realtek joydev dell_wmi sparse_keymap pn544_mei mei_phy pn544 hci nfc ppdev intel_rapl x86_pkg_temp_thermal intel_powerclamp cor etemp dell_laptop dcdbas kvm_intel arc4 kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse serio_raw btusb wmi bnep rfcomm bluetooth iwlmvm mac80211 snd_h da_intel snd_hda_codec snd_hwdep uvcvideo snd_pcm iwlwifi videobuf2_vmalloc videobuf2_memops videobuf2_core snd_page_alloc i915 snd_seq_midi snd_seq_midi_event snd_rawmidi parport_pc videodev video cfg80211 snd_seq snd_seq_device dr m_kms_helper snd_timer drm lpc_ich snd mac_hid mei_me i2c_algo_bit mei soundcore lp nls_iso8859_1 parport e1000e ahci libahci ptp pps_core Apr 2 09:46:26 lhs kernel: [ 305.963491] CPU: 2 PID: 2892 Comm: kworker/u8:12 Not tainted 3.13.0-21-generic #43-Ubuntu Apr 2 09:46:26 lhs kernel: [ 305.963492] Hardware name: Dell Inc. Latitude E7440/07F3F4, BIOS A08 02/18/2014 Apr 2 09:46:26 lhs kernel: [ 305.963515] Workqueue: i915 gen6_force_wake_work [i915] Apr 2 09:46:26 lhs kernel: [ 305.963520] 0000000000000009 ffff8803c2935d38 ffffffff81714914 ffff8803c2935d80 Apr 2 09:46:26 lhs kernel: [ 305.963523] ffff8803c2935d70 ffffffff810676bd ffff880406c48020 ffff880406c48028 Apr 2 09:46:26 lhs kernel: [ 305.963526] 0000000000000246 0000000000000000 0000000000000100 ffff8803c2935dd0 Apr 2 09:46:26 lhs kernel: [ 305.963527] Call Trace: Apr 2 09:46:26 lhs kernel: [ 305.963534] [<ffffffff81714914>] dump_stack+0x45/0x56 Apr 2 09:46:26 lhs kernel: [ 305.963538] [<ffffffff810676bd>] warn_slowpath_common+0x7d/0xa0 Apr 2 09:46:26 lhs kernel: [ 305.963540] [<ffffffff8106772c>] warn_slowpath_fmt+0x4c/0x50 Apr 2 09:46:26 lhs kernel: [ 305.963547] [<ffffffff8109a65a>] ? try_to_wake_up+0x1fa/0x2c0 Apr 2 09:46:26 lhs kernel: [ 305.963568] [<ffffffffa02b6de8>] gen6_gt_check_fifodbg.isra.9+0x38/0x50 [i915] Apr 2 09:46:26 lhs kernel: [ 305.963585] [<ffffffffa02b6e8b>] __gen6_gt_force_wake_mt_put+0x2b/0x30 [i915] Apr 2 09:46:26 lhs kernel: [ 305.963602] [<ffffffffa02b6bb7>] gen6_force_wake_work+0x37/0x50 [i915] Apr 2 09:46:26 lhs kernel: [ 305.963606] [<ffffffff81083892>] process_one_work+0x182/0x450 Apr 2 09:46:26 lhs kernel: [ 305.963610] [<ffffffff81084631>] worker_thread+0x121/0x410 Apr 2 09:46:26 lhs kernel: [ 305.963614] [<ffffffff81084510>] ? rescuer_thread+0x3e0/0x3e0 Apr 2 09:46:26 lhs kernel: [ 305.963617] [<ffffffff8108b302>] kthread+0xd2/0xf0 Apr 2 09:46:26 lhs kernel: [ 305.963620] [<ffffffff8108b230>] ? kthread_create_on_node+0x1d0/0x1d0 Apr 2 09:46:26 lhs kernel: [ 305.963624] [<ffffffff8172523c>] ret_from_fork+0x7c/0xb0 Apr 2 09:46:26 lhs kernel: [ 305.963627] [<ffffffff8108b230>] ? kthread_create_on_node+0x1d0/0x1d0 Apr 2 09:46:26 lhs kernel: [ 305.963629] ---[ end trace 396fb56d04ab9b14 ]--- Apr 2 09:46:26 lhs kernel: [ 306.542815] PM: suspend of devices complete after 599.849 msecs Apr 2 09:46:26 lhs kernel: [ 306.543013] PM: late suspend of devices complete after 0.196 msecs -- 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/1301601 Title: [Dell Inc. Latitude E7440] suspend failure Status in “linux” package in Ubuntu: Incomplete Bug description: Closed lid, expecting laptop to suspend, but found it later hot, frozen and *not* suspended. (Airflow was not the best, since it was in a bag.) ProblemType: KernelOops DistroRelease: Ubuntu 14.04 Package: linux-image-3.13.0-21-generic 3.13.0-21.43 ProcVersionSignature: Ubuntu 3.13.0-21.43-generic 3.13.8 Uname: Linux 3.13.0-21-generic x86_64 Annotation: This occured during a previous suspend and prevented it from resuming properly. ApportVersion: 2.14-0ubuntu1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: lightdm 1288 F.... pulseaudio oyvind 1866 F.... pulseaudio /dev/snd/controlC1: lightdm 1288 F.... pulseaudio oyvind 1866 F.... pulseaudio Date: Wed Apr 2 22:46:06 2014 ExecutablePath: /usr/share/apport/apportcheckresume Failure: suspend/resume HibernationDevice: RESUME=UUID=d913ab68-ff2c-481e-9e50-2cddfc2bfc33 InstallationDate: Installed on 2014-04-01 (1 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326) InterpreterPath: /usr/bin/python3.4 MachineType: Dell Inc. Latitude E7440 ProcCmdline: /usr/bin/python3 /usr/share/apport/apportcheckresume ProcEnviron: TERM=linux PATH=(custom, no user) ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-21-generic.efi.signed root=UUID=7255658f-91f7-4dba-b6c4-185cd810e17b ro quiet splash vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-3.13.0-21-generic N/A linux-backports-modules-3.13.0-21-generic N/A linux-firmware 1.127 SourcePackage: linux Title: [Dell Inc. Latitude E7440] suspend/resume failure UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: dmi.bios.date: 02/18/2014 dmi.bios.vendor: Dell Inc. dmi.bios.version: A08 dmi.board.name: 07F3F4 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA08:bd02/18/2014:svnDellInc.:pnLatitudeE7440:pvr01:rvnDellInc.:rn07F3F4:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E7440 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1301601/+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
