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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.

share|improve this question
    
Have you tried to connect to another wifi and see if the problem persist? –  Blaze Tama Nov 22 '13 at 5:16
    
I believe the problem is there when I do not use the wifi for like 2 mins, I was on a unsecured network this afternoon for almost 30 mins but I was downloading a bigger file and did not have that problem. I can test later on a different network and post the results. However win 8 on the same laptop works on this same network, my phone, 2 other home computers, my home tv all uses the same wifi no problems. –  rrag Nov 22 '13 at 5:39
    
Have you tried to reset your router? Turn it off, wait at least 10 seconds, and turn it on again. Sometimes this reset fix some strange problems. –  Blaze Tama Nov 22 '13 at 5:41
1  
I hate to say this, but it does work, got to give it to you, I feel stupid after this fix. –  rrag Nov 22 '13 at 6:16
1  
I don't have the reputation to comment so I will formulate my comment as an answer to Luca's question about drivers for the centrino 7260. I had the same problems with frequent wifi drops. The proposed answer from this Thread of restarting the router did not help. I ended up installing a new kernel version 3.12 based on this HowTo. However, they do warn you that installing the new kernel might result in problems. But it work –  user1901493 Dec 14 '13 at 9:43

3 Answers 3

up vote 0 down vote accepted

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

share|improve this answer

I think that this is only a workaround. I have a Lenovo U430 too, with the Centrino wireless 7260 wireless card and I have the same problem. Wireless connection works on Ubuntu 13.10 out-of-the-box but about every 10 minutes the connection is lost. By resetting it with the network manager (disable and re-enable) the wifi works again, at least for another 10 mins.

Have you some tips about 7260 driver? As previously said, Ubuntu 13.10 uses 3.11.0-13-generic kernel..

Thanks, Luca

share|improve this answer
    
This is both an answer and a question. Add the question part as a comment to the original question. –  Luís de Sousa Nov 24 '13 at 14:47

As updated in a comment, updating the Kernel fixed the problem.

I have a Lenovo u530 - 7260 wireless driver.

modinfo iwlwifi | grep -e 7260 -e version
version:        in-tree:
firmware:       iwlwifi-7260-7.ucode
srcversion:     A3081EB36A8BAE67C8037E0
vermagic:       3.12.0-031200-generic SMP mod_unload modversions
share|improve this answer

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