5

I do not use the wired Ethernet Card. It seems to me that, Ubuntu is always trying in boot time to check the network via eth0, Which consumes some times and I guess this may slow down the boot process a bit. My dmesg output is below (partial) 

2012-06-11 23:06:47 Ubuntu-KDE  kernel  [    1.985592] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:01/input/input5
2012-06-11 23:06:47 Ubuntu-KDE  kernel  [    1.985651] ACPI: Video Device [GFX0] (multi-head: yes  rom: no  post: no)
2012-06-11 23:06:47 Ubuntu-KDE  kernel  [    1.985693] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
2012-06-11 23:06:47 Ubuntu-KDE  kernel  [    2.056261] firewire_core: created device fw0: GUID 00023f87af41fd7d, S400
2012-06-11 23:06:47 Ubuntu-KDE  kernel  [    3.710435] EXT4-fs (sda9): mounted filesystem with ordered data mode. Opts: (null)

                                 A big time here.....

2012-06-11 23:06:47 Ubuntu-KDE  kernel  [   13.466642] ADDRCONF(NETDEV_UP): eth0: link is not ready
2012-06-11 23:06:47 Ubuntu-KDE  kernel  [   14.125296] Adding 1050620k swap on /dev/sda6.  Priority:-1 extents:1 across:1050620k 
2012-06-11 23:06:47 Ubuntu-KDE  kernel  [   14.226952] EXT4-fs (sda9): re-mounted. Opts: (null)
2012-06-11 23:06:47 Ubuntu-KDE  kernel  [   14.335012] snd_hda_intel 0000:00:1b.0: PCI INT A -> GSI 22 (level, low) -> IRQ 22
2012-06-11 23:06:47 Ubuntu-KDE  kernel  [   14.335091] snd_hda_intel 0000:00:1b.0: irq 45 for MSI/MSI-X
2012-06-11 23:06:47 Ubuntu-KDE  kernel  [   14.335128] snd_hda_intel 0000:00:1b.0: setting latency timer to 64
2012-06-11 23:06:47 Ubuntu-KDE  kernel  [   14.346410] input: Ideapad extra buttons as /devices/platform/ideapad/input/input6
2012-06-11 23:06:47 Ubuntu-KDE  kernel  [   14.428551] input: HDA Intel Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input7
2012-06-11 23:06:47 Ubuntu-KDE  kernel  [   14.436958] cfg80211: Calling CRDA to update world regulatory domain
2012-06-11 23:06:47 Ubuntu-KDE  kernel  [   14.476550] Linux video capture interface: v2.00
2012-06-11 23:06:47 Ubuntu-KDE  kernel  [   14.486385] uvcvideo: Found UVC 1.00 device USB 2.0 Camera (04f2:b008)

So, My question is How can I disable the Ethernet card completely, so that kernel will not try to use that?

Jorge Castro
  • 73,717
Anwar
  • 77,855

2 Answers2

7

Blacklist the NIC driver

  1. Create a blacklist file in /etc/modprobe.d/

Note that files in /etc/modprobe.d/ must have .conf suffix. Also naming modules in /etc/modprobe.d/blacklist.conf does not affect autoloading of modules by the kernel so you have to make your own file.

Example of a blacklist file: blacklist-ethernet.conf

blacklist driver_0     # eth0 by default

Note: here driver_0 is the name of your NIC driver. you can find the name of kernel driver for your LAN card by using the command lspci -v command in a terminal.
For Example my output was : 

........
........ 
6:00.0 Ethernet controller: Broadcom Corporation NetLink BCM5906M Fast Ethernet PCI Express (rev 02)
    Subsystem: Lenovo Device 3861
    Flags: bus master, fast devsel, latency 0, IRQ 46
    Memory at b8000000 (64-bit, non-prefetchable) [size=64K]
    Expansion ROM at  [disabled]
    Capabilities: 
    Kernel driver in use: tg3
    Kernel modules: tg3
........
........

Here, I see the driver is tg3. so you need to write tg3(or your driver) in the place of driver_0.

  1. Generate modules.dep and map files by running: depmod -ae

  2. Recreate your initrd: update-initramfs -u

Plenty of info can be found here.

Community
  • 1
pl1nk
  • 6,667
1

When booting, press the special key to enter your computer's BIOS configuration, before Ubuntu starts booting. Inside the BIOS, you should be able to disable the integrated NIC. If it is not available there, and this is a workstation PC, rather than a laptop, consult the manual for the motherboard (or for the computer itself, if a branded PC), and there should be a jumper to disable it on hardware. Make sure the computer is powered off, and unplugged before touching any jumpers though.

dobey
  • 41,650