Apologies: the above comment was valid for -rc2. Now it is already at -rc8, I booted the new kernel but still get the same result: [ 60.875316] PM: Creating hibernation image: [ 60.955114] PM: Need to copy 287934 pages [ 60.955116] PM: Normal pages needed: 287934 + 1024, available pages: 1773760 [ 60.875949] PM: Restoring platform NVS memory [ 60.876407] Enabling non-boot CPUs ... [ 60.876432] x86: Booting SMP configuration: [ 60.876432] smpboot: Booting Node 0 Processor 1 APIC 0x2 [ 60.888111] kvm: enabling virtualization on CPU1 [ 60.890245] Intel pstate controlling: cpu 1 [ 60.890283] CPU1 is up [ 60.890294] smpboot: Booting Node 0 Processor 2 APIC 0x4 [ 60.901995] kvm: enabling virtualization on CPU2 [ 60.904106] Intel pstate controlling: cpu 2 [ 60.904141] CPU2 is up [ 60.904173] smpboot: Booting Node 0 Processor 3 APIC 0x6 [ 60.915897] kvm: enabling virtualization on CPU3 [ 60.918088] Intel pstate controlling: cpu 3 [ 60.918123] CPU3 is up [ 60.920780] ACPI: Waking up from system sleep state S4 [ 60.920864] ACPI: \_SB_.PWRB: ACPI_NOTIFY_DEVICE_WAKE event [ 60.921096] ACPI: \_SB_.PCI0.RP01: ACPI_NOTIFY_BUS_CHECK event [ 60.921108] ACPI: \_SB_.PCI0.RP03: ACPI_NOTIFY_BUS_CHECK event [ 60.921115] ACPI: \_SB_.PCI0.RP04: ACPI_NOTIFY_BUS_CHECK event [ 60.924218] PM: noirq restore of devices complete after 2.983 msecs [ 60.924421] PM: early restore of devices complete after 0.169 msecs [ 60.969914] usb usb3: root hub lost power or was reset [ 60.969916] usb usb4: root hub lost power or was reset [ 60.969989] mei_me 0000:00:16.0: irq 42 for MSI/MSI-X [ 60.970009] snd_hda_intel 0000:00:03.0: irq 46 for MSI/MSI-X [ 60.970026] usb usb1: root hub lost power or was reset [ 60.970054] xhci_hcd 0000:00:14.0: irq 47 for MSI/MSI-X [ 60.970135] usb usb2: root hub lost power or was reset [ 60.970173] snd_hda_intel 0000:00:1b.0: irq 48 for MSI/MSI-X [ 60.973917] ehci-pci 0000:00:1a.0: cache line size of 64 is not supported [ 60.974214] ehci-pci 0000:00:1d.0: cache line size of 64 is not supported [ 60.974288] i8042 kbd 00:09: System wakeup disabled by ACPI [ 60.975380] sd 0:0:0:0: [sda] Starting disk [ 61.244642] ------------[ cut here ]------------ [ 61.244664] WARNING: CPU: 3 PID: 173 at /home/apw/COD/linux/drivers/gpu/drm/i915/intel_ddi.c:960 intel_ddi_pll_enable+0x23f/0x250 [i915]() [ 61.244665] SPLL already enabled [ 61.244680] Modules linked in: pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) rfcomm bnep bluetooth 6lowpan_iphc x86_pkg_temp_thermal intel_powerclamp coretemp snd_hda_codec_realtek kvm_intel kvm snd_hda_codec_hdmi snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq parport_pc serio_raw intel_smartconnect snd_seq_device snd_timer microcode snd soundcore mei_me mei ppdev lp parport shpchp lpc_ich mac_hid tpm_infineon dm_crypt hid_generic usbhid hid crct10dif_pclmul crc32_pclmul mxm_wmi ghash_clmulni_intel aesni_intel i915 aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd i2c_algo_bit drm_kms_helper ahci drm r8169 libahci mii wmi video [ 61.244682] CPU: 3 PID: 173 Comm: kworker/u8:6 Tainted: G OE 3.15.0-031500rc8-generic #201406012235 [ 61.244682] Hardware name: MSI MS-7817/B85M-E45 (MS-7817), BIOS V10.2 09/25/2013 [ 61.244686] Workqueue: events_unbound async_run_entry_fn [ 61.244687] 00000000000003c0 ffff8800359a39d8 ffffffff81762641 ffffffff81c53478 [ 61.244688] ffff8800359a3a28 ffff8800359a3a18 ffffffff81069e2c 0000000000000246 [ 61.244689] 0000000094000000 ffff880035a80000 0000000094000000 0000000000000001 [ 61.244689] Call Trace: [ 61.244692] [] dump_stack+0x46/0x58 [ 61.244694] [] warn_slowpath_common+0x8c/0xc0 [ 61.244696] [] warn_slowpath_fmt+0x46/0x50 [ 61.244706] [] intel_ddi_pll_enable+0x23f/0x250 [i915] [ 61.244716] [] haswell_crtc_mode_set+0x57/0x140 [i915] [ 61.244725] [] intel_crtc_mode_set+0x59/0x120 [i915] [ 61.244733] [] __intel_set_mode+0x1d7/0x380 [i915] [ 61.244742] [] intel_modeset_setup_hw_state+0x354/0x3b0 [i915] [ 61.244747] [] __i915_drm_thaw+0x143/0x210 [i915] [ 61.244750] [] ? pci_pm_suspend_noirq+0x1a0/0x1a0 [ 61.244755] [] i915_resume+0x28/0x50 [i915] [ 61.244757] [] ? pci_pm_suspend_noirq+0x1a0/0x1a0 [ 61.244762] [] i915_pm_resume+0x16/0x20 [i915] [ 61.244763] [] pci_pm_restore+0x93/0xf0 [ 61.244765] [] dpm_run_callback+0x56/0xa0 [ 61.244767] [] device_resume+0xde/0x210 [ 61.244768] [] async_resume+0x21/0x50 [ 61.244769] [] async_run_entry_fn+0x3b/0x140 [ 61.244771] [] process_one_work+0x17f/0x4c0 [ 61.244772] [] worker_thread+0x11b/0x3d0 [ 61.244774] [] ? manage_workers.isra.21+0x190/0x190 [ 61.244775] [] kthread+0xc9/0xe0 [ 61.244776] [] ? flush_kthread_worker+0xb0/0xb0 [ 61.244777] [] ret_from_fork+0x7c/0xb0 [ 61.244778] [] ? flush_kthread_worker+0xb0/0xb0 [ 61.244779] ---[ end trace 2b16bb7b079b5bce ]--- [ 61.292392] usb 1-1: reset high-speed USB device number 2 using ehci-pci [ 61.292408] ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300) [ 61.295802] ata1.00: configured for UDMA/133 [ 61.300388] ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 61.307101] ata3.00: configured for UDMA/100 [ 61.684570] usb 3-1: reset low-speed USB device number 2 using xhci_hcd [ 61.961991] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff88021115ae40 [ 61.961993] usb 3-1: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes [ 61.964198] PM: restore of devices complete after 993.915 msecs [ 61.964343] PM: Image restored successfully. [ 61.964360] PM: Basic memory bitmaps freed [ 61.964362] Restarting tasks ... [ 61.964379] ACPI: \_SB_.PCI0.RP01: Bus check in hotplug_event() [ 61.964388] ACPI: \_SB_.PCI0.RP03: Bus check in hotplug_event() [ 61.964409] r8169 0000:02:00.0: no hotplug settings from platform [ 61.964412] ACPI: \_SB_.PCI0.RP04: Bus check in hotplug_event() [ 61.964509] pci_bus 0000:04: Allocating resources [ 61.964521] pci 0000:03:00.0: bridge window [io 0x1000-0x0fff] to [bus 04] add_size 1000 [ 61.964523] pci 0000:03:00.0: bridge window [mem 0x00100000-0x000fffff 64bit pref] to [bus 04] add_size 200000 [ 61.964525] pci 0000:03:00.0: bridge window [mem 0x00100000-0x000fffff] to [bus 04] add_size 200000 [ 61.964527] pci 0000:03:00.0: res[14]=[mem 0x00100000-0x000fffff] get_res_add_size add_size 200000 [ 61.964528] pci 0000:03:00.0: res[15]=[mem 0x00100000-0x000fffff 64bit pref] get_res_add_size add_size 200000 [ 61.964529] pci 0000:03:00.0: res[13]=[io 0x1000-0x0fff] get_res_add_size add_size 1000 [ 61.964533] pci 0000:03:00.0: BAR 14: assigned [mem 0xdf600000-0xdf7fffff] [ 61.964538] pci 0000:03:00.0: BAR 15: assigned [mem 0xdf800000-0xdf9fffff 64bit pref] [ 61.964541] pci 0000:03:00.0: BAR 13: assigned [io 0x3000-0x3fff] [ 61.964543] pci 0000:03:00.0: PCI bridge to [bus 04] [ 61.964546] pci 0000:03:00.0: bridge window [io 0x3000-0x3fff] [ 61.964552] pci 0000:03:00.0: bridge window [mem 0xdf600000-0xdf7fffff] [ 61.964557] pci 0000:03:00.0: bridge window [mem 0xdf800000-0xdf9fffff 64bit pref] [ 61.964593] pci 0000:03:00.0: no hotplug settings from platform [ 61.965192] usb 2-1: USB disconnect, device number 2 [ 61.967593] done. [ 61.967599] video LNXVIDEO:00: Restoring backlight state [ 62.114942] r8169 0000:02:00.0 eth0: link down [ 62.114993] r8169 0000:02:00.0 eth0: link down [ 62.115003] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready [ 62.789125] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off Will now try again with "drm.debug=0x06" boot command option to get more details.