我在 gnome 环境中遇到了一些不寻常的启动时间。我运行了 bootchart 和 dsmeg，但我不知道该从中提取什么。
这是时间戳变得疯狂时的 dsmeg 日志
14.050672] input: HDA Intel HDMI HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:03.0/sound/card0/input16
[ 14.050712] input: HDA Intel HDMI HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:03.0/sound/card0/input17
[ 14.050757] input: HDA Intel HDMI HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:03.0/sound/card0/input18
[ 14.082924] input: HDA Intel PCH Mic as /devices/pci0000:00/0000:00:1b.0/sound/card1/input19
[ 14.082965] input: HDA Intel PCH Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card1/input20
[ 14.296485] uvcvideo: Found UVC 1.00 device Lenovo EasyCamera (5986:055e)
[ 14.299281] input: Lenovo EasyCamera as /devices/pci0000:00/0000:00:14.0/usb1/1-6/1-6:1.0/input/input21
[ 14.299350] usbcore: registered new interface driver uvcvideo
[ 14.299352] USB Video Class driver (1.1.1)
[ 15.808177] EXT4-fs (sda8): re-mounted. Opts: errors=remount-ro
[ 16.098723] EXT4-fs (sda6): mounted filesystem with ordered data mode. Opts: (null)
[ 16.116868] systemd-journald[318]: Received request to flush runtime journal from PID 1
[ 16.936316] audit: type=1400 audit(1443487935.139:2): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/tcpdump" pid=718 comm="apparmor_parser"
[ 16.960605] audit: type=1400 audit(1443487935.163:3): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/cups-browsed" pid=715 comm="apparmor_parser"
[ 17.034201] audit: type=1400 audit(1443487935.235:4): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/sbin/dhclient" pid=711 comm="apparmor_parser"
[ 17.034427] audit: type=1400 audit(1443487935.235:5): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=711 comm="apparmor_parser"
[ 17.034618] audit: type=1400 audit(1443487935.235:6): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/NetworkManager/nm-dhcp-helper" pid=711 comm="apparmor_parser"
[ 17.034804] audit: type=1400 audit(1443487935.235:7): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/connman/scripts/dhclient-script" pid=711 comm="apparmor_parser"
[ 17.268363] audit: type=1400 audit(1443487935.471:8): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=716 comm="apparmor_parser"
[ 17.268727] audit: type=1400 audit(1443487935.471:9): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/cupsd" pid=716 comm="apparmor_parser"
[ 17.268911] audit: type=1400 audit(1443487935.471:10): apparmor="STATUS" operation="profile_load" profile="unconfined" name="third_party" pid=716 comm="apparmor_parser"
[ 17.508585] audit: type=1400 audit(1443487935.711:11): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/telepathy/mission-control-5" pid=714 comm="apparmor_parser"
[ 103.380915] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 103.380917] Bluetooth: BNEP filters: protocol multicast
[ 103.380922] Bluetooth: BNEP socket layer initialized
[ 103.477099] Bluetooth: RFCOMM TTY layer initialized
[ 103.477106] Bluetooth: RFCOMM socket layer initialized
[ 103.477110] Bluetooth: RFCOMM ver 1.11
[ 104.817551] r8169 0000:09:00.0 eth0: link down
[ 104.817573] r8169 0000:09:00.0 eth0: link down
[ 106.459825] r8169 0000:09:00.0 eth0: link up
[ 107.261197] bbswitch: version 0.7
[ 107.261204] bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
[ 107.261210] bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
[ 107.261231] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95)
[ 107.261304] bbswitch: detected an Optimus _DSM function
[ 107.261313] bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
[ 108.672122] vgaarb: this pci device is not a vga device
[ 108.704006] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95)
[ 108.704033] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95)
[ 108.704046] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95)
[ 108.704065] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95)
[ 108.704076] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95)
[ 108.704088] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95)
[ 108.704111] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95)
[ 108.704123] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95)
[ 108.724689] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20141107/nsarguments-95)
[ 111.250635] vgaarb: this pci device is not a vga device
[ 114.331074] Non-volatile memory driver v1.3
[ 114.332830] thinkpad_acpi: ThinkPad ACPI Extras v0.25
[ 114.332832] thinkpad_acpi: http://ibm-acpi.sf.net/
[ 114.332833] thinkpad_acpi: ThinkPad BIOS 9ECN31WW(V1.14), EC unknown
[ 114.332834] thinkpad_acpi: Lenovo Lenovo Y50-70, model 20378
[ 114.380499] thinkpad_acpi: detected a 8-level brightness capable ThinkPad
[ 114.380542] thinkpad_acpi: Standard ACPI backlight interface available, not loading native one
[ 114.380618] thinkpad_acpi: Console audio control enabled, mode: monitor (read only)
[ 114.416620] input: ThinkPad Extra Buttons as /devices/platform/thinkpad_acpi/input/input22
[ 114.418115] thinkpad_ec: no ThinkPad embedded controller!
[ 114.458003] thinkpad_ec: no ThinkPad embedded controller!
[ 114.633546] acpi_call: Cannot get handle: Error: AE_NOT_FOUND
[ 114.640667] acpi_call: Cannot get handle: Error: AE_NOT_FOUND
[ 124.769979] audit_printk_skb: 30 callbacks suppressed
[ 124.769992] audit: type=1400 audit(1443488042.718:22): apparmor="DENIED" operation="open" profile="/usr/lib/telepathy/mission-control-5" name="/usr/share/dconf/profile/gdm" pid=1501 comm="mission-control" requested_mask="r" denied_mask="r" fsuid=121 ouid=0
[ 128.597071] vgaarb: this pci device is not a vga device
[ 136.325505] wlan0: authenticate with d8:50:e6:c8:a8:28
[ 136.349068] wlan0: send auth to d8:50:e6:c8:a8:28 (try 1/3)
[ 136.351498] wlan0: authenticated
[ 136.352643] wlan0: associate with d8:50:e6:c8:a8:28 (try 1/3)
[ 136.358875] wlan0: RX AssocResp from d8:50:e6:c8:a8:28 (capab=0x411 status=0 aid=2)
[ 136.359396] wlan0: associated
[ 140.768322] vgaarb: this pci device is not a vga device
另外这是我的启动图表。看起来它有 20 秒的空闲时间还是什么？https://i.stack.imgur.com/6E35W.jpg 由于我的名誉，我无法嵌入图片，因此我留下了一个 imgur 链接。
另外，这是 systemd-analyze 的结果：
graphical.target @1min 42.536s
└─multi-user.target @1min 42.535s
└─getty.target @1min 42.535s
└─[email protected] @1min 42.535s
└─systemd-user-sessions.service @1min 30.577s +1.277s
└─basic.target @1min 30.568s
└─sockets.target @1min 30.568s
└─acpid.socket @1min 30.568s
└─sysinit.target @1min 30.525s
└─networking.service @5.417s +46ms
└─apparmor.service @5.250s +165ms
└─local-fs.target @5.250s
└─run-user-1000-gvfs.mount @2min 5.982s
└─run-user-1000.mount @2min 4.452s
└─local-fs-pre.target @4.601s
└─systemd-remount-fs.service @4.597s +3ms
└─systemd-fsck-root.service @4.493s +103ms
└─systemd-fsckd.socket @434ms
└─-.slice @417ms