Checking Boot Messages with dmesg

Checking Boot Messages with dmesg

Sometimes you might need extra information, beyond what is available on the running system, about the configuration or the hardware. The system automatically probes the hardware and generates all kinds of potentially useful information at that time but keeps it socked away in the bowels of the system. Use dmesg to get at what you appalling detail.

To Check Status with dmesg:

  • dmesg | more

    Use dmesg (with the help of sudo and more) to gain some insight into the system (Code Listing 16.6).


  • dmesg | mail -s "Help me understand

    Send the output of dmesg to a friend for advice, if you're really stuck.


  • See Chapter 11 for more information about mailing files and data from the command line.

Code Listing 16.6. The dmesg utility helps you see what happens at boot, including the processes started and hardware found.

[jdoe@frazz jdoe]$ dmesg | more x98 ptys configured Serial driver version 5.05c (2001-07-08) with HUB-6 MANY_PORTS MULTIPORT SHARE_IRQ SERIA L_PCI ISAPNP enabled ttyS00 at 0x03f8 (irq = 4) is a 16550A Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx PIIX4: IDE controller on PCI bus 00 dev 39 PIIX4: chipset revision 1 PIIX4: not 100% native mode: will probe irqs later     ide0: BM-DMA at 0x1440-0x1447, BIOS settings: hda:pio, hdb:DMA     ide1: BM-DMA at 0x1448-0x144f, BIOS settings: hdc:DMA, hdd:pio hda: QUANTUM FIREBALLP LM30.0, ATA DISK drive hdb: Maxtor 32049H2, ATA DISK drive hdc: SAMSUNG DVD-ROM SD-612, ATAPI CD/DVD-ROM drive ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 ide1 at 0x170-0x177,0x376 on irq 15 hda: 58633344 sectors (30020 MB) w/1900KiB Cache, CHS=3649/255/63, UDMA(33) hdb: 40021632 sectors (20491 MB) w/2048KiB Cache, CHS=2491/255/63, UDMA(33) Partition check:  /dev/ide/host0/bus0/target0/lun0: p1 p4 < p5 p6 >  /dev/ide/host0/bus0/target1/lun0:<6> [EZD] [remap 0->1] [2491/255/63] p1  p1: <solaris: [s0] p5 [s1] p6 [s2] p7 [s3] p8 [s4] p9 [s5] p10 [s6] p11 [s7] p12 > RAMDISK driver initialized: 16 RAM disks of 32000K size 1024 blocksize md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27 md: Autodetecting RAID arrays. md: autorun ...  ... Mounted devfs on /dev Freeing unused kernel memory: 136k freed Real Time Clock Driver v1.10e usb.c: registered new driver usbdevfs usb.c: registered new driver hub usb-uhci.c: $Revision: 1.275 $ time 18:49:04 Sep 20 2002 usb-uhci.c: High bandwidth mode enabled PCI: Found IRQ 9 for device 00:07.2 PCI: Sharing IRQ 9 with 00:10.0 usb-uhci.c: USB UHCI at I/O 0x1400, IRQ 9 usb-uhci.c: Detected 2 ports usb.c: new USB bus registered, assigned bus number 1 hub.c: USB hub found hub.c: 2 ports detected -More- 

Unix(c) Visual Quickstart Guide
UNIX, Third Edition
ISBN: 0321442458
EAN: 2147483647
Year: 2006
Pages: 251

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