Wireless dies on ubuntu/mac airport extreme

[Nils Kassube]

Vijay Boyapati wrote:
> 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.

> >> 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."

What was the result of your attempt to disable the N protocol according 
to that suggestion? If it was still the same problem, you probably hit 
another bug.

> >> [  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

I'm not sure if this is related to your wireless. To me it looks more 
like it is related to your eth0. You could report a bug againts the 
kernel, see <https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies>.


Nils