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I have using Ubuntu 14.04 for some time now but a strange thing happened yesterday. My laptop does not detect wifi or LAN connections. I did some search and ran some commands. Here are the commands and outputs:

  1. sudo lshw -C network output:

      *-network UNCLAIMED
           description: Network controller
           product: AR9285 Wireless Network Adapter (PCI-Express)
           vendor: Qualcomm Atheros
           physical id: 0
           bus info: pci@0000:02:00.0
           version: 01
           width: 64 bits
           clock: 33MHz
           capabilities: pm msi pciexpress bus_master cap_list
           configuration: latency=0
           resources: memory:c3400000-c340ffff
  *-network UNCLAIMED
           description: Ethernet controller
           product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
           vendor: Realtek Semiconductor Co., Ltd.
           physical id: 0
           bus info: pci@0000:03:00.0
           version: 03
           width: 64 bits
           clock: 33MHz
           capabilities: pm msi pciexpress msix vpd bus_master cap_list
           configuration: latency=0
           resources: ioport:2000(size=256) memory:c1404000-c1404fff memory:c1400000-c1403fff memory:c1410000-c141ffff

  2. lspci -nnk | grep -iA2 net output:

    02:00.0 Network controller [0280]: Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) [168c:002b] (rev 01)
    Subsystem: Hewlett-Packard Company U98Z062.12 802.11bgn Wireless Half-size Mini PCIe Card [103c:3040]
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 03)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
7f:00.0 Host bridge [0600]: Intel Corporation Core Processor QuickPath Architecture Generic Non-core Registers [8086:2c62] (rev 02)

  3. lspci -nnk output:

    00:00.0 Host bridge [0600]: Intel Corporation Core Processor DRAM Controller [8086:0044] (rev 02)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
    Kernel driver in use: agpgart-intel
00:01.0 PCI bridge [0604]: Intel Corporation Core Processor PCI Express x16 Root Port [8086:0045] (rev 02)
    Kernel driver in use: pcieport
00:02.0 VGA compatible controller [0300]: Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
00:16.0 Communication controller [0780]: Intel Corporation 5 Series/3400 Series Chipset HECI Controller [8086:3b64] (rev 06)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
00:1a.0 USB controller [0c03]: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller [8086:3b3c] (rev 05)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
    Kernel driver in use: ehci-pci
00:1b.0 Audio device [0403]: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio [8086:3b56] (rev 05)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
00:1c.0 PCI bridge [0604]: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 [8086:3b42] (rev 05)
    Kernel driver in use: pcieport
00:1c.1 PCI bridge [0604]: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 2 [8086:3b44] (rev 05)
    Kernel driver in use: pcieport
00:1d.0 USB controller [0c03]: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller [8086:3b34] (rev 05)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
    Kernel driver in use: ehci-pci
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 Mobile PCI Bridge [8086:2448] (rev a5)
00:1f.0 ISA bridge [0601]: Intel Corporation Mobile 5 Series Chipset LPC Interface Controller [8086:3b09] (rev 05)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
00:1f.2 SATA controller [0106]: Intel Corporation 5 Series/3400 Series Chipset 4 port SATA AHCI Controller [8086:3b29] (rev 05)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
    Kernel driver in use: ahci
00:1f.3 SMBus [0c05]: Intel Corporation 5 Series/3400 Series Chipset SMBus Controller [8086:3b30] (rev 05)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
00:1f.6 Signal processing controller [1180]: Intel Corporation 5 Series/3400 Series Chipset Thermal Subsystem [8086:3b32] (rev 05)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Madison [Mobility Radeon HD 5650/5750 / 6530M/6550M] [1002:68c1]
    Subsystem: Hewlett-Packard Company Mobility Radeon HD 5650 [103c:144a]
01:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Redwood HDMI Audio [Radeon HD 5000 Series] [1002:aa60]
    Subsystem: Hewlett-Packard Company Device [103c:144a]
02:00.0 Network controller [0280]: Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) [168c:002b] (rev 01)
    Subsystem: Hewlett-Packard Company U98Z062.12 802.11bgn Wireless Half-size Mini PCIe Card [103c:3040]
03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 03)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
7f:00.0 Host bridge [0600]: Intel Corporation Core Processor QuickPath Architecture Generic Non-core Registers [8086:2c62] (rev 02)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
7f:00.1 Host bridge [0600]: Intel Corporation Core Processor QuickPath Architecture System Address Decoder [8086:2d01] (rev 02)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
7f:02.0 Host bridge [0600]: Intel Corporation Core Processor QPI Link 0 [8086:2d10] (rev 02)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
7f:02.1 Host bridge [0600]: Intel Corporation Core Processor QPI Physical 0 [8086:2d11] (rev 02)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
7f:02.2 Host bridge [0600]: Intel Corporation Core Processor Reserved [8086:2d12] (rev 02)
    Subsystem: Hewlett-Packard Company Device [103c:144a]
7f:02.3 Host bridge [0600]: Intel Corporation Core Processor Reserved [8086:2d13] (rev 02)

Subsystem: Hewlett-Packard Company Device [103c:144a]

Everything works fine when I boot 3.13.0-45-generic kernel. I do that by selecting it from Advanced Options from the GRUB menu. But when I boot into 3.13.0-46-generic (latest I have) the problem comes back.

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  • what's the content of cat /etc/network/interfaces? What happens if you do an ethtool eth0?
    – Fabby
    Mar 23, 2015 at 22:45
  • cat /etc/network/interfaces gives: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback ethtool eth0 gives: Settings for eth0: Cannot get device settings: No such device Cannot get wake-on-lan settings: No such device Cannot get message level: No such device Cannot get link status: No such device No data available
    – Aman_X
    Mar 24, 2015 at 9:12
  • One another piece of info...everything works fine when i boot in 3.13.0-45-generic kernel. I do that by selecting it from advanced options from the GRUB. But when i boot into 3.13.0-46-generic (latest i have) the problem comes back.
    – Aman_X
    Mar 24, 2015 at 9:15
  • 1
    What is the output of ifconfig on the 3.13.0-45 kernel? Also, edit your answer instead of putting that crucial information in the comments.
    – Fabby
    Mar 24, 2015 at 11:38
  • Thanks for the tip Fabby. I have done that. The output of ifconfig in 3.13.0-45 kernel looks like: lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:152 errors:0 dropped:0 overruns:0 frame:0 TX packets:152 errors:0 dropped:0 overruns:0 carrier:0 collisons:0 tzqueuelen:0 RX bytes:18687 (18.6 KB) TX bytes:18687 (18.6 KB)
    – Aman_X
    Mar 24, 2015 at 13:01

1 Answer 1

Reset to default
1

I kept using 3.13.0-45-generic kernel for a couple of days. In the meantime new kernel updates were downloaded by Software Updater and this fixed the problem.

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