wireless - wifi keeps dropping on Lenovo U430 touch - Running Ubuntu 13.10

Recently I installed ubuntu 13.10 on my new Lenovo U430 Touch alongside windows 8.1

Now wifi keeps dropping every few mins, I disable and enable wifi and then it works again, but dropped after a few mins again.

I checked many forums and none of the suggestions seem to work. This problem does not happen on win 8 though.

Here is the output of

sudo lspci -nnk | grep -B4 Network

    Subsystem: Lenovo Device [17aa:3978]

01:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 10)
    Subsystem: Lenovo Device [17aa:3801]
    Kernel driver in use: r8169
02:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b2] (rev 73)

and the output of

 dmesg | tail -n 50 

as soon as the wifi stopped

[ 6493.935237] WARNING: CPU: 0 PID: 6423 at /build/buildd/linux-3.11.0/net/mac80211/util.c:1538 ieee80211_reconfig+0x1234/0x13f0 [mac80211]()
[ 6493.935240] Modules linked in: hid_generic hid_multitouch uvcvideo videobuf2_vmalloc videobuf2_memops usbhid videobuf2_core videodev hid btusb parport_pc(F) ppdev(F) bnep rfcomm bluetooth snd_hda_codec_hdmi snd_hda_codec_realtek joydev(F) arc4(F) x86_pkg_temp_thermal coretemp kvm(F) nls_iso8859_1(F) crct10dif_pclmul(F) crc32_pclmul(F) ghash_clmulni_intel(F) aesni_intel(F) aes_x86_64(F) lrw(F) gf128mul(F) glue_helper(F) ablk_helper(F) cryptd(F) iwlmvm mac80211 snd_hda_intel iwlwifi snd_hda_codec snd_hwdep(F) snd_pcm(F) cfg80211 snd_page_alloc(F) i915 snd_seq_midi(F) microcode(F) snd_seq_midi_event(F) psmouse(F) snd_rawmidi(F) snd_seq(F) serio_raw(F) snd_seq_device(F) drm_kms_helper wmi snd_timer(F) drm ideapad_laptop sparse_keymap snd(F) lpc_ich i2c_algo_bit mei_me mei soundcore(F) video(F) intel_smartconnect mac_hid lp(F) parport(F) ext2(F) ahci(F) libahci(F) r8169 mii(F)
[ 6493.935362] CPU: 0 PID: 6423 Comm: kworker/0:4 Tainted: GF       W    3.11.0-13-generic #20-Ubuntu
[ 6493.935365] Hardware name: LENOVO 20270/Cherry 4A Touch, BIOS 7CCN32WW 09/04/2013
[ 6493.935380] Workqueue: events ieee80211_restart_work [mac80211]

[ 6493.935382]  0000000000000009 ffff880008e69d40 ffffffff816e54ba 0000000000000000
[ 6493.935401]  ffff880008e69d78 ffffffff81061dbd ffff880158b8e800 0000000000000003
[ 6493.935407]  00000000ffffffea ffff880157498600 0000000000000004 ffff880008e69d88
[ 6493.935413] Call Trace:
[ 6493.935419]  [] dump_stack+0x45/0x56
[ 6493.935427]  [] warn_slowpath_common+0x7d/0xa0
[ 6493.935454]  [] warn_slowpath_null+0x1a/0x20
[ 6493.935474]  [] ieee80211_reconfig+0x1234/0x13f0 [mac80211]
[ 6493.935492]  [] ieee80211_restart_work+0x87/0xa0 [mac80211]
[ 6493.935509]  [] process_one_work+0x17c/0x430

[ 6493.935514]  [] worker_thread+0x11c/0x3c0
[ 6493.935520]  [] ? manage_workers.isra.24+0x2a0/0x2a0
[ 6493.935528]  [] kthread+0xc0/0xd0
[ 6493.935549]  [] ? kthread_create_on_node+0x120/0x120
[ 6493.935554]  [] ret_from_fork+0x7c/0xb0
[ 6493.935561]  [] ? kthread_create_on_node+0x120/0x120

Appreciate help in resolving it.

PS. I am a new user for ubuntu and have added the details I seem to think might help identify the problem.

Ehm..i dont know how to explain this BUT...

1. Turn off your router.


2. Wait at least 10 secs.


3. Turn it on again.

Or, the short answer : just restart your router, it might saved you from a lot of strange problems :D