Wireless dies on ubuntu/mac airport extreme

Sat Nov 19 20:25:47 UTC 2011

Hi guys, not sure if this got sent because it was reported as too long. I
clipped it, so hopefully it gets through this time.

On Fri, Nov 18, 2011 at 12:28 PM, Vijay Boyapati <vijayb at gmail.com> wrote:
>
>> Dear Ubuntu gurus, I'm having a problem with my wireless at home that
>> I've never had before.
>>
>> I know the problem is somehow related to Ubuntu's (I'm running Natty
>> 11.04) interaction with my router (mac airport extreme) because:
>>
>> - My laptop is dual boot with windows
>> - On windows wireless works fine at home
>> - On Ubuntu wireless works fine everywhere except home (coffee shops etc)
>>
>> When I boot into Ubuntu wireless will work fine for a few minutes and
>> then become increasingly flaky. I am not 100% sure, but I suspect the
>> flakiness begins or is exacerbated when I ssh into a remote machine (just a
>> theory, I could be wrong).
>>
>>
>> A friend who's a linux sysadmin suggested this when he saw the output of
>> my dmesg (which I paste below):
>>
>> "Definitely see some kernel debug stuff going on. It's probably a bug
>> with the N protocol. Try disabling N as indicated here:
>> http://www.thinkwiki.org/wiki/Intel_Centrino_Wireless-N_1000
>>
>> I think I had something like that happen once upon a time. This will
>> scale you back to G speeds (54Mbps), but probably will be stable."
>>
>>
>> Any ideas or help on how to solve this? Diagnostics below
>>
>> --------------------------------------------------------------
>> 64 bytes from sea09s01-in-f18.1e100.net (173.194.33.18): icmp_req=145
>> ttl=55 time=13.9 ms
>> 64 bytes from sea09s01-in-f18.1e100.net (173.194.33.18): icmp_req=146
>> ttl=55 time=11.5 ms
>> From menger.local (10.0.1.8) icmp_seq=186 Destination Host Unreachable
>> From menger.local (10.0.1.8) icmp_seq=187 Destination Host Unreachable
>> 64 bytes from 173.194.33.18: icmp_req=190 ttl=55 time=26.1 ms
>> 64 bytes from 173.194.33.18: icmp_req=193 ttl=55 time=14.1 ms
>> ^C64 bytes from 173.194.33.18: icmp_req=199 ttl=55 time=11.9 ms
>>
>> --- google.com ping statistics ---
>> 199 packets transmitted, 138 received, +2 errors, 30% packet loss, time
>> 245416ms
>> rtt min/avg/max/mdev = 8.765/12.457/57.745/4.468 ms, pipe 2
>> ------------------------------------
>> vijay at menger:~$ lspci
>> 00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor
>> Family DRAM Controller (rev 09)
>> 00:01.0 PCI bridge: Intel Corporation 2nd Generation Core Processor
>> Family PCI Express Root Port (rev 09)
>> 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
>> Processor Family Integrated Graphics Controller (rev 09)
>> 00:16.0 Communication controller: Intel Corporation 6 Series Chipset
>> Family MEI Controller #1 (rev 04)
>> 00:1a.0 USB Controller: Intel Corporation 6 Series Chipset Family USB
>> Enhanced Host Controller #2 (rev 05)
>> 00:1b.0 Audio device: Intel Corporation 6 Series Chipset Family High
>> Definition Audio Controller (rev 05)
>> 00:1c.0 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express
>> Root Port 1 (rev b5)
>> 00:1c.1 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express
>> Root Port 2 (rev b5)
>> 00:1c.2 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express
>> Root Port 3 (rev b5)
>> 00:1c.3 PCI bridge: Intel Corporation 6 Series Chipset Family PCI Express
>> Root Port 4 (rev b5)
>> 00:1d.0 USB Controller: Intel Corporation 6 Series Chipset Family USB
>> Enhanced Host Controller #1 (rev 05)
>> 00:1f.0 ISA bridge: Intel Corporation HM65 Express Chipset Family LPC
>> Controller (rev 05)
>> 00:1f.2 SATA controller: Intel Corporation 6 Series Chipset Family 6 port
>> SATA AHCI Controller (rev 05)
>> 00:1f.3 SMBus: Intel Corporation 6 Series Chipset Family SMBus Controller
>> (rev 05)
>> 01:00.0 VGA compatible controller: ATI Technologies Inc NI Seymour [AMD
>> Radeon HD 6470M]
>> 07:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
>> RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 06)
>> 0d:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000
>> 13:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Device
>> 5209 (rev 01)
>> 19:00.0 USB Controller: NEC Corporation uPD720200 USB 3.0 Host Controller
>> (rev 04)
>>
>> ----------------------------------------------------------------------------------------------------------------------
>> vijay at menger:~$ ping 10.0.1.1
>> PING 10.0.1.1 (10.0.1.1) 56(84) bytes of data.
>> From 10.0.1.8 icmp_seq=8 Destination Host Unreachable
>> From 10.0.1.8 icmp_seq=9 Destination Host Unreachable
>> From 10.0.1.8 icmp_seq=10 Destination Host Unreachable
>> From 10.0.1.8 icmp_seq=11 Destination Host Unreachable
>> From 10.0.1.8 icmp_seq=12 Destination Host Unreachable
>> From 10.0.1.8 icmp_seq=15 Destination Host Unreachable
>> ^C
>> --- 10.0.1.1 ping statistics ---
>> 18 packets transmitted, 0 received, +6 errors, 100% packet loss, time
>> 17027ms
>> pipe 3
>> vijay at menger:~$ ping 10.0.1.0
>> Do you want to ping broadcast? Then -b
>> vijay at menger:~$
>>
>>
>>
>> ----------------------------------------------------------------------------------------------------------------------
>> DMESG (clipped to tail):
>>
>> [  970.832882] WARNING: at /build/buildd/linux-2.6.38/net/sched/sch_generic.c:256 dev_watchdog+0x2a0/0x2b0()
>> [  970.832887] Hardware name: HP Pavilion dv6 Notebook PC
>> [  970.832892] NETDEV WATCHDOG: eth0 (r8169): transmit queue 0 timed out
>> [  970.832896] Modules linked in: usbhid hid aesni_intel cryptd aes_x86_64 aes_generic parport_pc ppdev snd_hda_codec_hdmi snd_hda_codec_idt joydev binfmt_misc arc4 snd_hda_intel snd_hda_codec iwlagn snd_hwdep i915 snd_pcm snd_seq_midi snd_rawmidi iwlcore snd_seq_midi_event mac80211 snd_seq uvcvideo hp_wmi sparse_keymap videodev snd_timer psmouse drm_kms_helper v4l2_compat_ioctl32 fglrx(P) cfg80211 drm snd_seq_device snd serio_raw rts_pstor(C) i2c_algo_bit soundcore snd_page_alloc video hp_accel lis3lv02d input_polldev lp parport ahci xhci_hcd r8169 libahci
>> [  970.832980] Pid: 0, comm: swapper Tainted: P         C  2.6.38-8-generic #42-Ubuntu
>> [  970.832985] Call Trace:
>> [  970.832989]  <IRQ>  [<ffffffff81065cef>] ? warn_slowpath_common+0x7f/0xc0
>> [  970.833009]  [<ffffffff81065de6>] ? warn_slowpath_fmt+0x46/0x50
>> [  970.833019]  [<ffffffff814ef450>] ? dev_watchdog+0x2a0/0x2b0
>> [  970.833031]  [<ffffffff81013a85>] ? native_sched_clock+0x15/0x70
>> [  970.833040]  [<ffffffff81013ae9>] ? sched_clock+0x9/0x10
>> [  970.833048]  [<ffffffff8108ea9d>] ? sched_clock_cpu+0xbd/0x110
>> [  970.833056]  [<ffffffff814ef1b0>] ? dev_watchdog+0x0/0x2b0
>> [  970.833067]  [<ffffffff81074964>] ? call_timer_fn+0x44/0x130
>> [  970.833075]  [<ffffffff814ef1b0>] ? dev_watchdog+0x0/0x2b0
>> [  970.833084]  [<ffffffff81075fb4>] ? run_timer_softirq+0x134/0x280
>> [  970.833093]  [<ffffffff8102c85d>] ? lapic_next_event+0x1d/0x30
>> [  970.833100]  [<ffffffff8106d538>] ? __do_softirq+0xa8/0x1c0
>> [  970.833111]  [<ffffffff810983ef>] ? tick_program_event+0x1f/0x30
>> [  970.833118]  [<ffffffff8100cf1c>] ? call_softirq+0x1c/0x30
>> [  970.833125]  [<ffffffff8100ea45>] ? do_softirq+0x65/0xa0
>> [  970.833132]  [<ffffffff8106d755>] ? irq_exit+0x85/0x90
>> [  970.833142]  [<ffffffff815cafb0>] ? smp_apic_timer_interrupt+0x70/0x9b
>> [  970.833150]  [<ffffffff8100c9d3>] ? apic_timer_interrupt+0x13/0x20
>> [  970.833154]  <EOI>  [<ffffffff81098310>] ? tick_dev_program_event+0x40/0x100
>> [  970.833171]  [<ffffffff8133685a>] ? intel_idle+0xca/0x120
>> [  970.833178]  [<ffffffff81336839>] ? intel_idle+0xa9/0x120
>> [  970.833190]  [<ffffffff814a3bda>] ? cpuidle_idle_call+0xaa/0x1b0
>> [  970.833203]  [<ffffffff8100a266>] ? cpu_idle+0xa6/0xf0
>> [  970.833210]  [<ffffffff815a9205>] ? rest_init+0x75/0x80
>> [  970.833221]  [<ffffffff81acac8b>] ? start_kernel+0x3f5/0x400
>> [  970.833231]  [<ffffffff81aca388>] ? x86_64_start_reservations+0x132/0x136
>> [  970.833239]  [<ffffffff81aca253>] ? zap_identity_mappings+0x3e/0x41
>> [  970.833248]  [<ffffffff81aca458>] ? x86_64_start_kernel+0xcc/0xdb
>> [  970.833253] ---[ end trace 705b7b8584bf326e ]---
>> [  970.873044] r8169 0000:07:00.0: eth0: link up
>>
>>
>
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