Here is a dmesg log that has a traceback. Is the result of a clean power on, suspend and resume. I didn't have a freeze this time but maybe the problem is related to this. [ 39.996883] ACPI: Preparing to enter system sleep state S3 [ 40.028699] PM: Saving platform NVS memory [ 40.028705] Disabling non-boot CPUs ... [ 40.028734] intel_pstate CPU 1 exiting [ 40.029899] kvm: disabling virtualization on CPU1 [ 40.029907] smpboot: CPU 1 is now offline [ 40.030237] intel_pstate CPU 2 exiting [ 40.031404] kvm: disabling virtualization on CPU2 [ 40.031411] smpboot: CPU 2 is now offline [ 40.031688] intel_pstate CPU 3 exiting [ 40.031813] Broke affinity for irq 16 [ 40.031821] Broke affinity for irq 23 [ 40.031822] Broke affinity for irq 24 [ 40.031823] Broke affinity for irq 27 [ 40.031824] Broke affinity for irq 32 [ 40.032826] kvm: disabling virtualization on CPU3 [ 40.032835] smpboot: CPU 3 is now offline [ 40.034143] ACPI: Low-level resume complete [ 40.034179] PM: Restoring platform NVS memory [ 40.034510] Enabling non-boot CPUs ... [ 40.034544] x86: Booting SMP configuration: [ 40.034544] smpboot: Booting Node 0 Processor 1 APIC 0x1 [ 40.046530] kvm: enabling virtualization on CPU1 [ 40.048794] CPU1 is up [ 40.048813] smpboot: Booting Node 0 Processor 2 APIC 0x2 [ 40.060800] kvm: enabling virtualization on CPU2 [ 40.063061] CPU2 is up [ 40.063081] smpboot: Booting Node 0 Processor 3 APIC 0x3 [ 40.075084] kvm: enabling virtualization on CPU3 [ 40.077362] CPU3 is up [ 40.080842] ACPI: Waking up from system sleep state S3 [ 40.190171] acpi LNXPOWER:00: Turning OFF [ 40.234221] xhci_hcd 0000:00:14.0: System wakeup disabled by ACPI [ 40.254241] ehci-pci 0000:00:1a.0: System wakeup disabled by ACPI [ 40.274259] ehci-pci 0000:00:1d.0: System wakeup disabled by ACPI [ 40.274303] PM: noirq resume of devices complete after 64.031 msecs [ 40.442614] PM: early resume of devices complete after 168.104 msecs [ 40.442780] e1000e 0000:00:19.0: System wakeup disabled by ACPI [ 40.442926] rtlwifi: wireless switch is on [ 40.443022] rtc_cmos 00:02: System wakeup disabled by ACPI [ 40.446194] sd 4:0:0:0: [sda] Starting disk [ 40.718975] usb 1-7: reset full-speed USB device number 2 using xhci_hcd [ 40.762816] ata5: SATA link up 6.0 Gbps (SStatus 133 SControl 300) [ 40.763412] ata5.00: ACPI cmd ef/02:00:00:00:00:a0 (SET FEATURES) succeeded [ 40.763414] ata5.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) filtered out [ 40.764971] ata5.00: ACPI cmd ef/02:00:00:00:00:a0 (SET FEATURES) succeeded [ 40.764973] ata5.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) filtered out [ 40.765900] ata5.00: configured for UDMA/133 [ 40.770826] ata1: SATA link up 1.5 Gbps (SStatus 113 SControl 300) [ 40.772866] ata1.00: ACPI cmd e3/00:00:00:00:00:a0 (IDLE) succeeded [ 40.773877] ata1.00: ACPI cmd e3/00:00:00:00:00:a0 (IDLE) succeeded [ 40.779535] ata1.00: ACPI cmd e3/00:00:00:00:00:a0 (IDLE) succeeded [ 40.780542] ata1.00: ACPI cmd e3/00:00:00:00:00:a0 (IDLE) succeeded [ 40.782414] ata1.00: configured for UDMA/133 [ 40.849102] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8804074edc00 [ 40.849103] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8804074edc48 [ 40.849104] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8804074edc90 [ 40.849105] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8804074edcd8 [ 40.959232] usb 1-11: reset full-speed USB device number 3 using xhci_hcd [ 41.087436] usb 1-11: No LPM exit latency info found, disabling LPM. [ 41.087797] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880407e56300 [ 41.087799] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880407e56348 [ 41.087800] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880407e56390 [ 41.087801] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800d5981780 [ 41.087801] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800d59817c8 [ 41.199560] usb 1-12: reset high-speed USB device number 4 using xhci_hcd [ 41.338032] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff880407463b40 [ 41.339216] PM: resume of devices complete after 895.622 msecs [ 41.339710] PM: Finishing wakeup. [ 41.339711] Restarting tasks ... done. [ 41.344122] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment [ 41.344149] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment [ 41.344208] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment [ 41.344272] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment [ 41.344552] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment [ 41.344571] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment [ 41.344911] pci_bus 0000:01: Allocating resources [ 41.344928] pci_bus 0000:02: Allocating resources [ 41.344950] pci_bus 0000:03: Allocating resources [ 41.344963] pci_bus 0000:08: Allocating resources [ 41.344986] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment [ 41.345058] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment [ 41.345213] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment [ 41.362578] ACPI: \_SB_.PCI0.LPCB.H_EC.LED_: Excess arguments - Caller passed 2, method requires 1 (20141107/nsarguments-263) [ 41.417492] thinkpad_ec: thinkpad_ec_read_row: failed requesting row: (0x01:0x00)->0xfffffff0 [ 41.417521] thinkpad_ec: initial ec test failed [ 41.690288] Using firmware rtlwifi/rtl8192eefw_new.bin [ 41.691419] ieee80211 phy1: Selected rate control algorithm 'rtl_rc' [ 41.691823] rtlwifi: wireless switch is on [ 41.944274] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready [ 42.561756] BUG: unable to handle kernel paging request at ffffffffc0d2ad88 [ 42.561785] IP: [] halbtc_get_rfreg+0x23/0x30 [btcoexist] [ 42.561812] PGD 2c18067 PUD 2c1a067 PMD 409a32067 PTE 0 [ 42.561831] Oops: 0000 [#1] SMP [ 42.561843] Modules linked in: rtl8192ee(OE) msr(E) acpi_call(OE) pci_stub(E) vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) uvcvideo(E) videobuf2_vmalloc(E) videobuf2_memops(E) videobuf2_core(E) v4l2_common(E) videodev(E) media(E) bnep(E) rfcomm(E) btusb(E) bluetooth(E) intel_rapl(E) iosf_mbi(E) x86_pkg_temp_thermal(E) intel_powerclamp(E) coretemp(E) arc4(E) kvm_intel(E) kvm(E) btcoexist(OE) rtl_pci(OE) crct10dif_pclmul(E) rtlwifi(OE) crc32_pclmul(E) ghash_clmulni_intel(E) mac80211(E) aesni_intel(E) aes_x86_64(E) lrw(E) gf128mul(E) glue_helper(E) ablk_helper(E) cryptd(E) nfsd(E) auth_rpcgss(E) nfs_acl(E) joydev(E) serio_raw(E) nfs(E) cfg80211(E) binfmt_misc(E) lockd(E) grace(E) rtsx_pci_ms(E) sunrpc(E) memstick(E) fscache(E) lpc_ich(E) snd_hda_codec_hdmi(E) thinkpad_acpi(E) nvram(E) mac_hid(E) intel_smartconnect(E) snd_hda_codec_realtek(E) snd_hda_codec_generic(E) snd_hda_intel(E) snd_hda_controller(E) snd_hda_codec(E) snd_hwdep(E) snd_pcm(E) snd_seq_midi(E) snd_seq_midi_event(E) snd_rawmidi(E) snd_seq(E) snd_seq_device(E) snd_timer(E) snd(E) ie31200_edac(E) mei_me(E) soundcore(E) mei(E) edac_core(E) parport_pc(E) ppdev(E) lp(E) parport(E) nls_iso8859_1(E) rtsx_pci_sdmmc(E) i915(E) i2c_algo_bit(E) psmouse(E) drm_kms_helper(E) ahci(E) libahci(E) rtsx_pci(E) e1000e(E) ptp(E) pps_core(E) drm(E) wmi(E) video(E) [last unloaded: rtl8192ee] [ 42.562264] CPU: 2 PID: 1003 Comm: NetworkManager Tainted: G OE 3.19.0-031900-generic #201502091451 [ 42.562295] Hardware name: LENOVO 20AS0001LM/20AS0001LM, BIOS J4ET37WW(1.10) 11/12/2013 [ 42.562319] task: ffff880407fb75c0 ti: ffff880409408000 task.ti: ffff880409408000 [ 42.562341] RIP: 0010:[] [] halbtc_get_rfreg+0x23/0x30 [btcoexist] [ 42.562380] RSP: 0018:ffff88040940b518 EFLAGS: 00010246 [ 42.562397] RAX: ffffffffc0d2ad60 RBX: ffffffffc099a420 RCX: 00000000000fffff [ 42.562418] RDX: 000000000000001e RSI: 0000000000000000 RDI: ffff880409a40680 [ 42.562441] RBP: ffff88040940b518 R08: 0000000000000001 R09: 0000000000000001 [ 42.562466] R10: 0000000000000000 R11: ffffffffc0c8af20 R12: ffff8800c66f1ac0 [ 42.562487] R13: ffff8800c66f0680 R14: 0000000000000000 R15: 0000000000000001 [ 42.562510] FS: 00007fb27bd05880(0000) GS:ffff88041f280000(0000) knlGS:0000000000000000 [ 42.562535] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 42.563537] CR2: ffffffffc0d2ad88 CR3: 0000000408655000 CR4: 00000000001407e0 [ 42.564524] Stack: [ 42.565484] ffff88040940b538 ffffffffc09671d3 0000000000000006 ffff8800c66f1ac0 [ 42.566462] ffff88040940b548 ffffffffc0963845 ffff88040940b558 ffffffffc0988845 [ 42.567436] ffff88040940b578 ffffffffc0c78dc4 ffff8800c66f1ac0 ffff8800c66f1ac0 [ 42.568404] Call Trace: [ 42.569369] [] ex_halbtc8192e2ant_init_hwconfig+0x33/0x240 [btcoexist] [ 42.570352] [] exhalbtc_init_hw_config+0x95/0xd0 [btcoexist] [ 42.571346] [] rtl_btc_init_hw_config+0x15/0x30 [btcoexist] [ 42.572333] [] rtl92ee_bt_hw_init+0x34/0x40 [rtl8192ee] [ 42.573326] [] rtl92ee_hw_init+0x1194/0x18a0 [rtl8192ee] [ 42.574323] [] rtl_pci_start+0x5d/0x1f0 [rtl_pci] [ 42.575294] [] rtl_op_start+0x59/0xd0 [rtlwifi] [ 42.576244] [] ieee80211_do_open+0x324/0xe50 [mac80211] [ 42.577207] [] ieee80211_open+0x61/0x70 [mac80211] [ 42.578154] [] __dev_open+0xb7/0x130 [ 42.579098] [] __dev_change_flags+0xac/0x180 [ 42.580028] [] dev_change_flags+0x30/0x70 [ 42.580952] [] do_setlink+0x2a1/0x780 [ 42.581868] [] ? __nla_reserve+0x53/0x70 [ 42.582789] [] ? __nla_put+0x29/0x40 [ 42.583685] [] ? __nla_reserve+0x53/0x70 [ 42.584572] [] rtnl_newlink+0x4c9/0x720 [ 42.585450] [] ? rtnl_newlink+0x10a/0x720 [ 42.586325] [] ? security_capable+0x18/0x20 [ 42.587193] [] ? ns_capable+0x20/0x60 [ 42.588056] [] rtnetlink_rcv_msg+0x155/0x240 [ 42.588905] [] ? rhashtable_lookup_compare+0x44/0x80 [ 42.589718] [] ? __netlink_lookup+0x3e/0x50 [ 42.590502] [] ? __rtnl_unlock+0x20/0x20 [ 42.591256] [] netlink_rcv_skb+0xb9/0xe0 [ 42.591978] [] rtnetlink_rcv+0x25/0x40 [ 42.592674] [] netlink_unicast+0x12b/0x1d0 [ 42.593342] [] netlink_sendmsg+0x36c/0x450 [ 42.593977] [] do_sock_sendmsg+0x8f/0xf0 [ 42.594590] [] ? rw_copy_check_uvector+0x78/0x120 [ 42.595183] [] sock_sendmsg+0x10/0x20 [ 42.595759] [] ___sys_sendmsg+0x33c/0x350 [ 42.596328] [] ? SYSC_sendto+0x18d/0x1a0 [ 42.596882] [] ? __fget_light+0x25/0x70 [ 42.597424] [] __sys_sendmsg+0x49/0x90 [ 42.597958] [] SyS_sendmsg+0x19/0x20 [ 42.598487] [] system_call_fastpath+0x16/0x1b [ 42.599015] Code: 90 80 01 00 00 5d c3 90 0f 1f 44 00 00 55 48 8b 47 08 40 0f b6 f6 48 89 e5 48 8b b8 90 06 00 00 48 8b 47 48 48 8b 80 30 74 00 00 <48> 8b 40 28 ff 90 78 01 00 00 5d c3 90 0f 1f 44 00 00 55 48 8b [ 42.600195] RIP [] halbtc_get_rfreg+0x23/0x30 [btcoexist] [ 42.600787] RSP [ 42.601355] CR2: ffffffffc0d2ad88 [ 42.601912] ---[ end trace 4d8be10c3097d3c2 ]---