引导过程中有30秒的间隔

我在Debian系统（jessie / sid）上进行了完整升级。不幸的是，现在启动时还有30秒的间隔，我真的不知道它来自哪里，我必须在哪里找到它。

我看了看，/var/log/dmesg发现一些有趣的文字。注意到之间的间隙27.280227和56.835253。

[   27.261104] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
[   27.280207] cfg80211: World regulatory domain updated:
[   27.280213] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[   27.280216] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (N/A, 2000 mBm)
[   27.280218] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm)
[   27.280220] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (N/A, 2000 mBm)
[   27.280223] cfg80211:   (5170000 KHz - 5250000 KHz @ 80000 KHz), (N/A, 2000 mBm)
[   27.280225] cfg80211:   (5735000 KHz - 5835000 KHz @ 80000 KHz), (N/A, 2000 mBm)
[   27.280227] cfg80211:   (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 0 mBm)
[   27.843406] [drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off
[   56.835253] EXT4-fs (dm-1): re-mounted. Opts: (null)
[   57.068560] EXT4-fs (dm-1): re-mounted. Opts: errors=remount-ro
[   57.615554] lp: driver loaded but no devices found
[   57.661815] ppdev: user-space parallel port driver
[   57.855124] fuse init (API version 7.22)
[   58.123866] Adding 4886524k swap on /dev/mapper/encrypted-swap.  Priority:-1 extents:1 across:4886524k
[   58.327537] EXT4-fs (sda4): mounted filesystem with ordered data mode. Opts: (null)
[   59.137990] RPC: Registered named UNIX socket transport module.
[   59.137996] RPC: Registered udp transport module.
[   59.137998] RPC: Registered tcp transport module.
[   59.138000] RPC: Registered tcp NFSv4.1 backchannel transport module.

搜索[drm] Enabling RC6 states: RC6 on, RC6p off, RC6pp off指向一些图形错误的点。由于有时我的图形卡（可切换图形卡）有问题，这可能是原因。

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) (prog-if 00 [VGA controller])
Subsystem: Dell Device 04cd
Flags: bus master, fast devsel, latency 0, IRQ 52
Memory at f6400000 (64-bit, non-prefetchable) [size=4M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
I/O ports at f000 [size=64]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M] (prog-if 00 [VGA controller])
Subsystem: Dell Radeon HD 6630M
Flags: bus master, fast devsel, latency 0, IRQ 53
Memory at e0000000 (64-bit, prefetchable) [size=256M]
Memory at f7b20000 (64-bit, non-prefetchable) [size=128K]
I/O ports at e000 [size=256]
Expansion ROM at f7b00000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
Capabilities: [150] Advanced Error Reporting
Kernel driver in use: fglrx_pci

正如我所说，我不知道在哪里看和要搜索什么。对于某些可能会有所帮助的关键字，我也感到很高兴。

希望我能提供您需要的信息。如果不是，那还不错，如果您还告诉我必须执行哪个命令才能获得所需的输出，因为我对“更深的系统”还不是很熟悉。

非常感谢你，

罗科

如果您不使用systemd，则可能是udev中的Debian错误754987，因为它涉及30秒的延迟。

我的dmesg日志文件中此错误的后果：

[   19.809738] input: HP WMI hotkeys as /devices/virtual/input/input14
[   25.107974] WARNING! power/level is deprecated; use power/control instead
[   50.739902] Adding 19800076k swap on /dev/sda5.  Priority:-1 extents:1 across:19800076k FS
[   50.780205] EXT4-fs (sda1): re-mounted. Opts: (null)
[   51.259666] EXT4-fs (sda1): re-mounted. Opts: errors=remount-ro
[   52.346718] lp: driver loaded but no devices found
[   52.469463] loop: module loaded
[   52.491077] smsc47b397: found SMSC SCH5317 (base address 0x0480, revision 1)
[   52.538276] fuse init (API version 7.23)

它看起来与您的相似。