Thread: Atheros 9462 in Ubuntu 12.04 very frequent wireless network drops

the network on (acer aspire v5-571-6869) laptop drops out frequently, between 20 seconds 20 minutes. come on it's own after, say, few long minutes. disconnecting wireless network , manually reconnecting solves problem.

card atheros 9462, , i'm running ubuntu 12.04. below system info, , fixes i've tried.

here output:

uname -pr

code:

3.2.0-38-generic x86_64

(dropped) ifconfig

code:

eth0      link encap:ethernet  hwaddr 20:6a:8a:88:24:5b             broadcast multicast  mtu:1500  metric:1           rx packets:0 errors:0 dropped:0 overruns:0 frame:0           tx packets:0 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000            rx bytes:0 (0.0 b)  tx bytes:0 (0.0 b)           interrupt:44 base address:0xc000   lo        link encap:local loopback             inet addr:127.0.0.1  mask:255.0.0.0           inet6 addr: ::1/128 scope:host           loopback running  mtu:16436  metric:1           rx packets:1402 errors:0 dropped:0 overruns:0 frame:0           tx packets:1402 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:0            rx bytes:153992 (153.9 kb)  tx bytes:153992 (153.9 kb)  wlan0     link encap:ethernet  hwaddr 44:6d:57:fc:4c:dc             inet addr:192.168.0.102  bcast:192.168.0.255  mask:255.255.255.0           inet6 addr: fe80::466d:57ff:fefc:4cdc/64 scope:link           broadcast running multicast  mtu:1500  metric:1           rx packets:28154 errors:0 dropped:0 overruns:0 frame:0           tx packets:19576 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000            rx bytes:35699855 (35.6 mb)  tx bytes:2176601 (2.1 mb)

(dropped) iwconfig

code:

lo        no wireless extensions.  wlan0     ieee 802.11abgn  essid:"videotron8492"             mode:managed  frequency:2.437 ghz  access point: 84:c9:b2:d3:09:12              bit rate=130 mb/s   tx-power=16 dbm              retry  long limit:7   rts thr:off   fragment thr:off           power management:on           link quality=65/70  signal level=-45 dbm             rx invalid nwid:0  rx invalid crypt:0  rx invalid frag:0           tx excessive retries:13  invalid misc:190   missed beacon:0  eth0      no wireless extensions.

(working) ifconfig

code:

eth0      link encap:ethernet  hwaddr 20:6a:8a:88:24:5b             broadcast multicast  mtu:1500  metric:1           rx packets:0 errors:0 dropped:0 overruns:0 frame:0           tx packets:0 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000            rx bytes:0 (0.0 b)  tx bytes:0 (0.0 b)           interrupt:44 base address:0xc000   lo        link encap:local loopback             inet addr:127.0.0.1  mask:255.0.0.0           inet6 addr: ::1/128 scope:host           loopback running  mtu:16436  metric:1           rx packets:417 errors:0 dropped:0 overruns:0 frame:0           tx packets:417 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:0            rx bytes:43525 (43.5 kb)  tx bytes:43525 (43.5 kb)  wlan0     link encap:ethernet  hwaddr 44:6d:57:fc:4c:dc             inet addr:192.168.0.102  bcast:192.168.0.255  mask:255.255.255.0           inet6 addr: fe80::466d:57ff:fefc:4cdc/64 scope:link           broadcast running multicast  mtu:1500  metric:1           rx packets:4887 errors:0 dropped:0 overruns:0 frame:0           tx packets:4289 errors:0 dropped:0 overruns:0 carrier:0           collisions:0 txqueuelen:1000            rx bytes:6098467 (6.0 mb)  tx bytes:510446 (510.4 kb)

(working) iwconfig

code:

lo        no wireless extensions.  wlan0     ieee 802.11abgn  essid:"videotron8492"             mode:managed  frequency:2.437 ghz  access point: 84:c9:b2:d3:09:12              bit rate=130 mb/s   tx-power=16 dbm              retry  long limit:7   rts thr:off   fragment thr:off           power management:on           link quality=68/70  signal level=-42 dbm             rx invalid nwid:0  rx invalid crypt:0  rx invalid frag:0           tx excessive retries:0  invalid misc:0   missed beacon:0  eth0      no wireless extensions.

diff on (working) , (dropped) above

code:

15,16c15,16 <           rx packets:1402 errors:0 dropped:0 overruns:0 frame:0 <           tx packets:1402 errors:0 dropped:0 overruns:0 carrier:0 --- >           rx packets:417 errors:0 dropped:0 overruns:0 frame:0 >           tx packets:417 errors:0 dropped:0 overruns:0 carrier:0 18c18 <           rx bytes:153992 (153.9 kb)  tx bytes:153992 (153.9 kb) --- >           rx bytes:43525 (43.5 kb)  tx bytes:43525 (43.5 kb) 24,25c24,25 <           rx packets:28154 errors:0 dropped:0 overruns:0 frame:0 <           tx packets:19576 errors:0 dropped:0 overruns:0 carrier:0 --- >           rx packets:4887 errors:0 dropped:0 overruns:0 frame:0 >           tx packets:4289 errors:0 dropped:0 overruns:0 carrier:0 27c27,28 <           rx bytes:35699855 (35.6 mb)  tx bytes:2176601 (2.1 mb) --- >           rx bytes:6098467 (6.0 mb)  tx bytes:510446 (510.4 kb) >  39c40 <           link quality=65/70  signal level=-45 dbm   --- >           link quality=68/70  signal level=-42 dbm   41c42 <           tx excessive retries:13  invalid misc:190   missed beacon:0 --- >           tx excessive retries:0  invalid misc:0   missed beacon:0

lspci -v

code:

02:00.0 unassigned class [ff00]: realtek semiconductor co., ltd. device 5289 (rev 01)     subsystem: acer incorporated [ali] device 0724     flags: bus master, fast devsel, latency 0, irq 7     memory @ f0600000 (32-bit, non-prefetchable) [size=64k]     capabilities: <access denied>  02:00.2 ethernet controller: realtek semiconductor co., ltd. rtl8111/8168b pci express gigabit ethernet controller (rev 0a)     subsystem: acer incorporated [ali] device 0724     flags: bus master, fast devsel, latency 0, irq 44     i/o ports @ 2000 [size=256]     memory @ f0404000 (64-bit, prefetchable) [size=4k]     memory @ f0400000 (64-bit, prefetchable) [size=16k]     capabilities: <access denied>     kernel driver in use: r8169     kernel modules: r8169  03:00.0 network controller: atheros communications inc. ar9462 wireless network adapter (rev 01)     subsystem: lite-on communications inc device 6621     flags: bus master, fast devsel, latency 0, irq 19     memory @ f0500000 (64-bit, non-prefetchable) [size=512k]     expansion rom @ dfa00000 [disabled] [size=64k]     capabilities: <access denied>     kernel driver in use: ath9k     kernel modules: ath9k

lsmod | grep ath

code:

ath9k                 132428  0  mac80211              506862  1 ath9k ath9k_common           14053  1 ath9k ath9k_hw              411239  2 ath9k,ath9k_common ath                    24067  3 ath9k,ath9k_common,ath9k_hw cfg80211              205774  3 ath9k,mac80211,ath

lsmod

code:

module                  size  used snd_hda_codec_hdmi     32474  1  snd_hda_codec_realtek   224173  1  parport_pc             32866  0  ppdev                  17113  0  rfcomm                 47604  12  bnep                   18281  2  joydev                 17693  0  acer_wmi               28418  0  sparse_keymap          13890  1 acer_wmi snd_hda_intel          33773  3  snd_hda_codec         127706  3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel snd_hwdep              17764  1 snd_hda_codec snd_pcm                97275  3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec snd_seq_midi           13324  0  snd_rawmidi            30748  1 snd_seq_midi snd_seq_midi_event     14899  1 snd_seq_midi snd_seq                61929  2 snd_seq_midi,snd_seq_midi_event psmouse                97485  0  arc4                   12529  2  wmi                    19256  1 acer_wmi serio_raw              13211  0  snd_timer              29990  2 snd_pcm,snd_seq snd_seq_device         14540  3 snd_seq_midi,snd_rawmidi,snd_seq ath9k                 132428  0  snd                    79041  16 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device mac80211              506862  1 ath9k ath9k_common           14053  1 ath9k ath9k_hw              411239  2 ath9k,ath9k_common ath                    24067  3 ath9k,ath9k_common,ath9k_hw uvcvideo               72627  0  i915                  477611  3  videodev               98259  1 uvcvideo cfg80211              205774  3 ath9k,mac80211,ath mac_hid                13253  0  v4l2_compat_ioctl32    17128  1 videodev btusb                  18332  2  drm_kms_helper         46978  1 i915 bluetooth             180153  23 rfcomm,bnep,btusb drm                   241971  4 i915,drm_kms_helper mei                    41616  0  i2c_algo_bit           13423  1 i915 video                  19651  1 i915 soundcore              15091  1 snd snd_page_alloc         18529  2 snd_hda_intel,snd_pcm lp                     17799  0  parport                46562  3 parport_pc,ppdev,lp usbhid                 47238  0  hid                    99636  1 usbhid r8169                  62154  0

lshw -class network

code:

  *-network                       description: ethernet interface        product: rtl8111/8168b pci express gigabit ethernet controller        vendor: realtek semiconductor co., ltd.        physical id: 0.2        bus info: pci@0000:02:00.2        logical name: eth0        version: 0a        serial: 20:6a:8a:88:24:5b        size: 10mbit/s        capacity: 1gbit/s        width: 64 bits        clock: 33mhz        capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation        configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3lk-napi duplex=half firmware=n/a latency=0 link=no multicast=yes port=mii speed=10mbit/s        resources: irq:44 ioport:2000(size=256) memory:f0404000-f0404fff memory:f0400000-f0403fff   *-network        description: wireless interface        product: ar9462 wireless network adapter        vendor: atheros communications inc.        physical id: 0        bus info: pci@0000:03:00.0        logical name: wlan0        version: 01        serial: 44:6d:57:fc:4c:dc        width: 64 bits        clock: 33mhz        capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless        configuration: broadcast=yes driver=ath9k driverversion=3.2.0-38-generic firmware=n/a ip=192.168.0.102 latency=0 link=yes multicast=yes wireless=ieee 802.11abgn        resources: irq:19 memory:f0500000-f057ffff memory:dfa00000-dfa0ffff

, here fixes i've tried

nohwcrypt (all below fixes done in conjunction this, also)

code:

i created file     /etc/modprobe.d/ath9k.conf  contains line     options ath9k nohwcrypt=1

disable ipv6

code:

i appended file     /etc/sysctl.conf  include lines     net.ipv6.conf.all.disable_ipv6 = 1    net.ipv6.conf.default.disable_ipv6 = 1    net.ipv6.conf.lo.disable_ipv6 = 1

disable 11n in iwlagn

code:

i created file     /etc/modprobe.d/iwlagn-disable11n.conf  contains line     options iwlagn 11n_disable=1  (though of course, don't see mod running)

blacklist acer_wmi mod

code:

i appended file     /etc/modprobe.d/blacklist.conf  contain line     blacklist acer_wmi

turn off power management

code:

i ran command    iwconfig wlan0 power off

has been driving me nuts, , preventing me working, 5 months. please let me know more can provide, or else try. thank you.

disable hardware encryption , power management of card:

code:

echo "options ath9k nohwcrypt=1" | sudo tee /etc/modprobe.d/ath9k.conf  sudo modprobe -rfv ath9k  sudo modprobe -v ath9k  sudo iwconfig wlan0 power off

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