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我最近开始遇到这个问题，我的系统启动和关闭的时间太长。我搜索了它，发现它dmesg显示了启动时进程的日志。这是我的日志dmesg。我把原木剪短了。我剪裁的流程似乎工作正常，但这就是问题出现的地方。有什么建议吗？
siera@Cybotron:~$ dmesg
[ 1.540147] tsc: Refined TSC clocksource calibration: 1696.073 MHz
[ 2.003598] EXT4-fs (sda3): mounted filesystem with ordered data mode. Opts: (null)
[ 2.540612] Switched to clocksource tsc
[ 2.596531] random: init urandom read with 115 bits of entropy available
[ 2.774045] random: nonblocking pool is initialized
[ 12.885594] systemd-udevd[292]: starting version 204
[ 12.977348] lp: driver loaded but no devices found
[ 12.985470] ppdev: user-space parallel port driver
[ 13.034744] hidraw: raw HID events driver (C) Jiri Kosina
[ 13.038293] [drm] Initialized drm 1.1.0 20060810
[ 13.065904] dw_dmac INTL9C60:00: DesignWare DMA Controller, 8 channels
[ 13.085231] wmi: Mapper loaded
[ 13.085489] mei_me 0000:00:16.0: irq 59 for MSI/MSI-X
[ 13.090509] [drm] Memory usable by graphics device = 2048M
[ 13.090514] [drm] Replacing VGA console driver
[ 13.091734] Console: switching to colour dummy device 80x25
[ 13.113041] i915 0000:00:02.0: irq 60 for MSI/MSI-X
[ 13.113056] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 13.113057] [drm] Driver supports precise vblank timestamp query.
[ 13.113117] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[ 13.142974] [drm] seamless DRRS supported for eDP panel.
[ 13.146930] AVX2 version of gcm_enc/dec engaged.
[ 13.181861] fbcon: inteldrmfb (fb0) is primary device
[ 13.189583] intel_rapl: Found RAPL domain package
[ 13.189585] intel_rapl: Found RAPL domain core
[ 13.189586] intel_rapl: Found RAPL domain uncore
[ 13.189588] intel_rapl: Found RAPL domain dram
[ 13.396405] EXT4-fs (sda3): re-mounted. Opts: errors=remount-ro
[ 13.648429] Bluetooth: Core ver 2.19
[ 13.648441] NET: Registered protocol family 31
[ 13.648442] Bluetooth: HCI device and connection manager initialized
[ 13.648448] Bluetooth: HCI socket layer initialized
[ 13.648450] Bluetooth: L2CAP socket layer initialized
[ 13.648458] Bluetooth: SCO socket layer initialized
[ 13.651522] usbcore: registered new interface driver btusb
[ 13.698489] FS-Cache: Loaded
[ 13.705044] RPC: Registered named UNIX socket transport module.
[ 13.705045] RPC: Registered udp transport module.
[ 13.705045] RPC: Registered tcp transport module.
[ 13.705045] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 13.712364] FS-Cache: Netfs 'nfs' registered for caching
[ 13.720024] bluetooth hci0: Direct firmware load failed with error -2
[ 13.720025] bluetooth hci0: Falling back to user helper
[ 13.722884] Installing knfsd (copyright (C) 1996 [email protected]).
[ 13.741688] dcdbas dcdbas: Dell Systems Management Base Driver (version 5.6.0-3.2)
[ 14.269505] Console: switching to colour frame buffer device 170x48
[ 14.272465] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 14.272466] i915 0000:00:02.0: registered panic notifier
[ 14.314026] [Firmware Bug]: ACPI(PEGP) defines _DOD but not _DOS
[ 14.328219] input: Dell WMI hotkeys as /devices/virtual/input/input8
[ 14.328940] hid-rmi 0018:06CB:2985.0001: Scanning PDT...
[ 14.331631] hid-rmi 0018:06CB:2985.0001: Found F34 on page 0x00
[ 14.333758] Bluetooth: hci0: BCM: patch brcm/BCM43142A0-0a5c-21d7.hcd not found
[ 14.334242] hid-rmi 0018:06CB:2985.0001: Found F01 on page 0x00
[ 14.336806] hid-rmi 0018:06CB:2985.0001: Found F11 on page 0x00
[ 14.342825] hid-rmi 0018:06CB:2985.0001: Found F54 on page 0x01
[ 14.345258] hid-rmi 0018:06CB:2985.0001: Found F30 on page 0x01
[ 14.346798] ACPI: Video Device [PEGP] (multi-head: yes rom: yes post: no)
[ 14.346869] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:08/LNXVIDEO:00/input/input9
[ 14.348492] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no)
[ 14.348582] input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:01/input/input10
[ 14.348675] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
[ 14.348978] snd_hda_intel 0000:00:1b.0: irq 61 for MSI/MSI-X
[ 14.349050] shpchp: Standard Hot Plug PCI Controller Driver version: 0.4
[ 14.351685] hid-rmi 0018:06CB:2985.0001: Found F55 on page 0x02
[ 14.357559] snd_hda_intel 0000:00:03.0: irq 62 for MSI/MSI-X
[ 14.358089] hid-rmi 0018:06CB:2985.0001: rmi_scan_pdt: Done with PDT scan.
[ 14.364770] cfg80211: Calling CRDA to update world regulatory domain
[ 14.370295] input: HDA Intel HDMI HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:03.0/sound/card0/input11
[ 14.370388] input: HDA Intel HDMI HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:03.0/sound/card0/input12
[ 14.370474] input: HDA Intel HDMI HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:03.0/sound/card0/input13
[ 14.374100] hid-rmi 0018:06CB:2985.0001: rmi_populate_f11: size in mm: 102 x 57
[ 14.384992] input: DLL0662:00 06CB:2985 as /devices/pci0000:00/INT33C3:00/i2c-1/i2c-DLL0662:00/0018:06CB:2985.0001/input/input7
[ 14.385127] hid-rmi 0018:06CB:2985.0001: input,hidraw0: <UNKNOWN> HID v1.00 Mouse [DLL0662:00 06CB:2985] on
[ 14.397757] sound hdaudioC1D0: autoconfig: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker
[ 14.397761] sound hdaudioC1D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[ 14.397762] sound hdaudioC1D0: hp_outs=1 (0x21/0x0/0x0/0x0/0x0)
[ 14.397763] sound hdaudioC1D0: mono: mono_out=0x0
[ 14.397765] sound hdaudioC1D0: inputs:
[ 14.397766] sound hdaudioC1D0: Headset Mic=0x19
[ 14.397768] sound hdaudioC1D0: Headphone Mic=0x1a
[ 14.397769] sound hdaudioC1D0: Internal Mic=0x12
[ 14.461851] cfg80211: World regulatory domain updated:
[ 14.461855] cfg80211: DFS Master region: unset
[ 14.461856] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
[ 14.461859] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
[ 14.461861] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
[ 14.461863] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
[ 14.461865] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
[ 14.461867] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
[ 14.481380] input: HDA Intel PCH Headphone Mic as /devices/pci0000:00/0000:00:1b.0/sound/card1/input14
[ 14.552475] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 14.552480] Bluetooth: BNEP filters: protocol multicast
[ 14.552490] Bluetooth: BNEP socket layer initialized
[ 14.556264] Bluetooth: RFCOMM TTY layer initialized
[ 14.556275] Bluetooth: RFCOMM socket layer initialized
[ 14.556279] Bluetooth: RFCOMM ver 1.11
[ 14.688385] audit: type=1400 audit(1454254759.588:2): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=632 comm="apparmor_parser"
[ 14.688393] audit: type=1400 audit(1454254759.588:3): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/cupsd" pid=632 comm="apparmor_parser"
[ 14.688839] audit: type=1400 audit(1454254759.588:4): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/sbin/dhclient" pid=661 comm="apparmor_parser"
[ 14.688846] audit: type=1400 audit(1454254759.588:5): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=661 comm="apparmor_parser"
[ 14.688851] audit: type=1400 audit(1454254759.588:6): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/connman/scripts/dhclient-script" pid=661 comm="apparmor_parser"
[ 14.688910] audit: type=1400 audit(1454254759.588:7): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=632 comm="apparmor_parser"
[ 14.689365] audit: type=1400 audit(1454254759.588:8): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=661 comm="apparmor_parser"
[ 14.689371] audit: type=1400 audit(1454254759.588:9): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/lib/connman/scripts/dhclient-script" pid=661 comm="apparmor_parser"
[ 14.689601] audit: type=1400 audit(1454254759.592:10): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/lib/connman/scripts/dhclient-script" pid=661 comm="apparmor_parser"
[ 14.692078] audit: type=1400 audit(1454254759.592:11): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/ntpd" pid=664 comm="apparmor_parser"
[ 14.825776] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
[ 14.835700] init: failsafe main process (684) killed by TERM signal
[ 14.903684] init: cups main process (665) killed by HUP signal
[ 14.903692] init: cups main process ended, respawning
[ 15.022962] init: Failed to obtain startpar-bridge instance: Unknown parameter: INSTANCE
[ 15.645110] wl: module license 'MIXED/Proprietary' taints kernel.
[ 15.645114] Disabling lock debugging due to kernel taint
[ 15.647692] wl: module verification failed: signature and/or required key missing - tainting kernel
[ 15.778318] wlan0: Broadcom BCM4365 802.11 Hybrid Wireless Controller 6.30.223.248 (r487574)
[ 16.660535] r8169 0000:07:00.0 eth0: link down
[ 16.660578] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 21.475309] init: plymouth-upstart-bridge main process ended, respawning
[ 22.921282] vboxdrv: Found 4 processor cores
[ 22.941064] vboxdrv: TSC mode is Invariant, tentative frequency 1696033481 Hz
[ 22.941067] vboxdrv: Successfully loaded version 5.0.2 (interface 0x00230003)
[ 23.144285] VBoxNetFlt: Successfully started.
[ 23.145769] VBoxNetAdp: Successfully started.
[ 23.147745] VBoxPciLinuxInit
[ 23.150634] vboxpci: IOMMU not found (not registered)
[ 23.487391] init: plymouth-stop pre-start process (1657) terminated with status 1
[ 38.151767] cfg80211: Calling CRDA for country: GB
[ 38.153750] cfg80211: Regulatory domain changed to country: GB
[ 38.153753] cfg80211: DFS Master region: unset
[ 38.153754] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
[ 38.153756] cfg80211: (2402000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
[ 38.153758] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
[ 38.153759] cfg80211: (5250000 KHz - 5330000 KHz @ 40000 KHz), (N/A, 2000 mBm), (0 s)
[ 38.153760] cfg80211: (5490000 KHz - 5710000 KHz @ 40000 KHz), (N/A, 2700 mBm), (0 s)
[ 38.153761] cfg80211: (57240000 KHz - 65880000 KHz @ 2160000 KHz), (N/A, 4000 mBm), (N/A)
[ 44.771234] audit_printk_skb: 141 callbacks suppressed
[ 44.771237] audit: type=1400 audit(1454254789.657:59): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=2369 comm="apparmor_parser"
[ 44.771243] audit: type=1400 audit(1454254789.657:60): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=2369 comm="apparmor_parser"
[ 44.771558] audit: type=1400 audit(1454254789.657:61): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/cupsd" pid=2369 comm="apparmor_parser"
siera@Cybotron:~$