My wifi connection has gone unstable and I suspect it has something to do with upgrading to 15.04.
I am working on a Lenovo Yoga 2 (not pro) laptop. The wireless card is Intel 7260, the driver is iwlwifi.
In case that is useful, here is additional info:
>> cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=15.04
DISTRIB_CODENAME=vivid
DISTRIB_DESCRIPTION="Ubuntu 15.04"
>> lsusb
Bus 003 Device 002: ID 8087:8000 Intel Corp.
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 048d:8350 Integrated Technology Express, Inc.
Bus 001 Device 005: ID 8087:07dc Intel Corp.
Bus 001 Device 004: ID 04f2:b40f Chicony Electronics Co., Ltd
Bus 001 Device 003: ID 04f3:0303 Elan Microelectronics Corp.
Bus 001 Device 002: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>> lspci -k -nn | grep -A 3 -i net
01:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b2] (rev 6b)
Subsystem: Intel Corporation Wireless-N 7260 [8086:c262]
Kernel driver in use: iwlwifi
>> sudo lshw -C network
*-network
description: Interface réseau sans fil
produit: Wireless 7260
fabriquant: Intel Corporation
identifiant matériel: 0
information bus: pci@0000:01:00.0
nom logique: wlan0
version: 6b
numéro de série: e8:b1:fc:0c:54:b3
bits: 64 bits
horloge: 33MHz
fonctionnalités: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=3.19.0-15-generic firmware=25.15.12.0 ip=192.168.25.76 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
ressources: irq:45 mémoire:b0400000-b0401fff
>> lsmod
Module Size Used by
ctr 16384 1
ccm 20480 1
binfmt_misc 20480 1
rfcomm 69632 8
bnep 20480 2
rtsx_usb_ms 20480 0
memstick 20480 1 rtsx_usb_ms
hid_sensor_magn_3d 16384 0
hid_sensor_incl_3d 16384 0
hid_sensor_rotation 16384 0
hid_sensor_accel_3d 16384 0
hid_sensor_gyro_3d 16384 0
hid_sensor_als 16384 0
hid_sensor_trigger 16384 12 hid_sensor_gyro_3d,hid_sensor_incl_3d,hid_sensor_accel_3d,hid_sensor_rotation,hid_sensor_als,hid_sensor_magn_3d
industrialio_triggered_buffer 16384 6 hid_sensor_gyro_3d,hid_sensor_incl_3d,hid_sensor_accel_3d,hid_sensor_rotation,hid_sensor_als,hid_sensor_magn_3d
kfifo_buf 16384 1 industrialio_triggered_buffer
industrialio 57344 9 hid_sensor_trigger,hid_sensor_gyro_3d,industrialio_triggered_buffer,hid_sensor_incl_3d,hid_sensor_accel_3d,hid_sensor_rotation,hid_sensor_als,kfifo_buf,hid_sensor_magn_3d
hid_sensor_iio_common 16384 6 hid_sensor_gyro_3d,hid_sensor_incl_3d,hid_sensor_accel_3d,hid_sensor_rotation,hid_sensor_als,hid_sensor_magn_3d
hid_multitouch 20480 0
hid_sensor_hub 20480 8 hid_sensor_trigger,hid_sensor_gyro_3d,hid_sensor_incl_3d,hid_sensor_accel_3d,hid_sensor_rotation,hid_sensor_als,hid_sensor_magn_3d,hid_sensor_iio_common
uvcvideo 90112 0
videobuf2_vmalloc 16384 1 uvcvideo
videobuf2_memops 16384 1 videobuf2_vmalloc
videobuf2_core 49152 1 uvcvideo
v4l2_common 16384 1 videobuf2_core
videodev 159744 3 uvcvideo,v4l2_common,videobuf2_core
usbhid 53248 0
media 24576 2 uvcvideo,videodev
btusb 32768 0
bluetooth 491520 22 bnep,btusb,rfcomm
arc4 16384 2
snd_hda_codec_hdmi 53248 1
joydev 20480 0
intel_rapl 20480 0
iosf_mbi 16384 1 intel_rapl
x86_pkg_temp_thermal 16384 0
intel_powerclamp 20480 0
coretemp 16384 0
kvm 483328 0
iwlmvm 278528 0
mac80211 720896 1 iwlmvm
crct10dif_pclmul 16384 0
crc32_pclmul 16384 0
ghash_clmulni_intel 16384 0
snd_hda_codec_realtek 86016 1
aesni_intel 172032 3
snd_hda_codec_generic 69632 1 snd_hda_codec_realtek
iwlwifi 196608 1 iwlmvm
aes_x86_64 20480 1 aesni_intel
lrw 16384 1 aesni_intel
i915 1052672 7
gf128mul 16384 1 lrw
cfg80211 540672 3 iwlwifi,mac80211,iwlmvm
glue_helper 16384 1 aesni_intel
ablk_helper 16384 1 aesni_intel
cryptd 20480 3 ghash_clmulni_intel,aesni_intel,ablk_helper
snd_soc_rt5640 94208 0
snd_soc_rl6231 16384 1 snd_soc_rt5640
snd_hda_intel 32768 7
snd_hda_controller 32768 1 snd_hda_intel
shpchp 40960 0
snd_hda_codec 143360 5 snd_hda_codec_realtek,snd_hda_codec_hdmi,snd_hda_codec_generic,snd_hda_intel,snd_hda_controller
snd_soc_core 196608 1 snd_soc_rt5640
snd_compress 20480 1 snd_soc_core
mei_me 20480 0
snd_hwdep 20480 1 snd_hda_codec
snd_pcm_dmaengine 16384 1 snd_soc_core
serio_raw 16384 0
mei 90112 1 mei_me
snd_pcm 106496 8 snd_soc_rt5640,snd_soc_core,snd_hda_codec_hdmi,snd_hda_codec,snd_hda_intel,snd_hda_controller,snd_pcm_dmaengine
snd_seq_midi 16384 0
lpc_ich 24576 0
snd_seq_midi_event 16384 1 snd_seq_midi
snd_rawmidi 32768 1 snd_seq_midi
snd_seq 69632 2 snd_seq_midi_event,snd_seq_midi
drm_kms_helper 122880 1 i915
snd_seq_device 16384 3 snd_seq,snd_rawmidi,snd_seq_midi
drm 344064 6 i915,drm_kms_helper
snd_timer 32768 2 snd_pcm,snd_seq
i2c_algo_bit 16384 1 i915
snd 90112 26 snd_hda_codec_realtek,snd_soc_core,snd_hwdep,snd_timer,snd_hda_codec_hdmi,snd_pcm,snd_seq,snd_rawmidi,snd_hda_codec_generic,snd_hda_codec,snd_hda_intel,snd_seq_device,snd_compress
ideapad_laptop 20480 0
soundcore 16384 2 snd,snd_hda_codec
sparse_keymap 16384 1 ideapad_laptop
i2c_hid 20480 0
hid 110592 4 i2c_hid,hid_multitouch,hid_sensor_hub,usbhid
video 20480 1 i915
dw_dmac 16384 0
dw_dmac_core 24576 1 dw_dmac
snd_soc_sst_acpi 16384 0
8250_dw 16384 0
i2c_designware_platform 16384 0
spi_pxa2xx_platform 24576 0
i2c_designware_core 16384 1 i2c_designware_platform
soc_button_array 16384 0
mac_hid 16384 0
parport_pc 32768 0
ppdev 20480 0
lp 20480 0
parport 45056 3 lp,ppdev,parport_pc
autofs4 40960 2
rtsx_usb_sdmmc 28672 0
rtsx_usb 24576 2 rtsx_usb_sdmmc,rtsx_usb_ms
psmouse 118784 0
ahci 36864 1
libahci 32768 1 ahci
sdhci_acpi 16384 0
sdhci 45056 1 sdhci_acpi
[/code]
[code]
>> iwconfig
wlan0 IEEE 802.11bgn ESSID:"GVT-947C"
Mode:Managed Frequency:2.462 GHz Access Point: 00:0C:C3:3B:94:7C
Bit Rate=1 Mb/s Tx-Power=22 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=45/70 Signal level=-65 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:13 Invalid misc:87 Missed beacon:0
>> ifconfig -a
lo Link encap:Boucle locale
inet adr:127.0.0.1 Masque:255.0.0.0
adr inet6: ::1/128 Scope:Hôte
UP LOOPBACK RUNNING MTU:65536 Metric:1
Packets reçus:6898 erreurs:0 :0 overruns:0 frame:0
TX packets:6898 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:0
Octets reçus:626740 (626.7 KB) Octets transmis:626740 (626.7 KB)
wlan0 Link encap:Ethernet HWaddr e8:b1:fc:0c:54:b3
inet adr:192.168.25.76 Bcast:192.168.25.255 Masque:255.255.255.0
adr inet6: fe80::eab1:fcff:fe0c:54b3/64 Scope:Lien
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Packets reçus:200288 erreurs:0 :0 overruns:0 frame:0
TX packets:139328 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:207651439 (207.6 MB) Octets transmis:19177032 (19.1 MB)
>> sudo iwlist scan
wlan0 Scan completed :
Cell 01 - Address: 00:0C:C3:3B:94:7C
Channel:11
Frequency:2.462 GHz (Channel 11)
Quality=48/70 Signal level=-62 dBm
Encryption key:on
ESSID:"GVT-947C"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=0000000de3b507a8
Extra: Last beacon: 26572ms ago
IE: Unknown: 00084756542D39343743
IE: Unknown: 010882848B962430486C
IE: Unknown: 03010B
IE: Unknown: 0706425220010D14
IE: Unknown: 2A0106
IE: Unknown: 2F0106
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: Unknown: 32040C121860
IE: Unknown: 0B0508007A0000
IE: Unknown: 2D1ABC1817FFFF000000000000000000000000000000000000000000
IE: Unknown: 3D160B001700000000000000000000000000000000000000
IE: Unknown: 7F03000008
IE: Unknown: DD800050F204104A0001101044000102103B000103104700107A100A47716E8627B12CA6C7656292D41021000842726F6164636F6D1023000842726F6164636F6D1024000631323334353610420004313233341054000800060050F20400011011000A42726F6164636F6D415010080002200C103C0001011049000600372A000120
IE: Unknown: DD090010180208040C0000
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
>> uname -r -m
3.19.0-15-generic x86_64
>> cat /etc/network/interfaces
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
>> nm-tool
>> sudo rfkill list
0: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
1: ideapad_bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
2: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
3: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
And as requested by spinxz in the comments below:
>> modinfo iwlwifi | grep 7260
firmware: iwlwifi-7260-10.ucode
>> dmesg | grep iwl
[ 2.303627] iwlwifi 0000:01:00.0: loaded firmware version 25.15.12.0 op_modeiwlmvm
[ 2.333529] iwlwifi 0000:01:00.0: Detected Intel(R) Wireless N 7260, REV=0x144
[ 2.333581] iwlwifi 0000:01:00.0: L1 Disabled - LTR Enabled
[ 2.333802] iwlwifi 0000:01:00.0: L1 Disabled - LTR Enabled
[ 2.555400] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
[ 4.830019] iwlwifi 0000:01:00.0: L1 Disabled - LTR Enabled
[ 4.830243] iwlwifi 0000:01:00.0: L1 Disabled - LTR Enabled
[ 66.550674] iwlwifi 0000:01:00.0: L1 Disabled - LTR Enabled
[ 66.550900] iwlwifi 0000:01:00.0: L1 Disabled - LTR Enabled
Another request (by gertvdijk in the comments below):
>> apt-cache policy linux-firmware
linux-firmware:
Installé : 1.143
Candidat : 1.143
Table de version :
*** 1.143 0
500 http://fr.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
100 /var/lib/dpkg/status
To answer another question of sinxz, here is the output of dmesg | grep iwl after a disconnect and reconnect:
[ 2.303627] iwlwifi 0000:01:00.0: loaded firmware version 25.15.12.0 op_mode iwlmvm
[ 2.333529] iwlwifi 0000:01:00.0: Detected Intel(R) Wireless N 7260, REV=0x144
[ 2.333581] iwlwifi 0000:01:00.0: L1 Disabled - LTR Enabled
[ 2.333802] iwlwifi 0000:01:00.0: L1 Disabled - LTR Enabled
[ 2.555400] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
[ 4.830019] iwlwifi 0000:01:00.0: L1 Disabled - LTR Enabled
[ 4.830243] iwlwifi 0000:01:00.0: L1 Disabled - LTR Enabled
[ 66.550674] iwlwifi 0000:01:00.0: L1 Disabled - LTR Enabled
[ 66.550900] iwlwifi 0000:01:00.0: L1 Disabled - LTR Enabled
[ 2212.567922] iwlwifi 0000:01:00.0: L1 Disabled - LTR Enabled
[ 2212.568146] iwlwifi 0000:01:00.0: L1 Disabled - LTR Enabled
Edit: I also posted this question on the official French Ubuntu forum (here), and a user there made remarks that raise two questions:
- Is it possible that power management was always off on my previous version of Ubuntu (14.10)?
-
Is it normal that there is a file iwlwifi.conf in /etc/modprobe.d with the following content?
# /etc/modprobe.d/iwlwifi.conf
# iwlwifi will dyamically load either iwldvm or iwlmvm depending on the
# microcode file installed on the system. When removing iwlwifi, first
# remove the iwl?vm module and then iwlwifi.
remove iwlwifi \
(/sbin/lsmod | grep -o -e ^iwlmvm -e ^iwldvm -e ^iwlwifi | xargs/sbin/rmmod) \
&& /sbin/modprobe -r mac80211
Edit 2: It seems that my problem could now be completely solved. Let me make a few clarifications: the "instability" of my connection can be summed up by two "symptoms":
- Slow rates (concretely, max download speed at around 150Kb/s instead of 1Mb/s when it worked properly)
- "Effective disconnection" very frequently (every 30 seconds, say). What I mean by that is that the connection is not working at all, but the wifi does not "officially" disconnect. It comes back after waiting a few seconds (10 to 20s, say) or reconnecting to the network.
At first I thought that doing sudo iwconfig wlan0 power off solved these issues completely, even if turning off power management is apparently not a "sustainable" solution (see spinxz's comments below). However I then realized that symptom #2 is still there, although much less frequently.
On the French Ubuntu forum (here), someone suggested I try to manually put the latest version of the version 12 firmware (downloadable here: https://wireless.wiki.kernel.org/_media/en/users/drivers/iwlwifi-7260-ucode-25.17.12.0.tgz) in /lib/firmware. I did that, and now the problem seems to be solved completely. To be honest, it might also have something to do with recent Ubuntu updates (they were a lot recently), I don't know. I am still not 100% certain the connection is back to working perfectly, or if it is only as good as the "power management off" solution, for example. I will let you know if that is the case.
Best Answer
I have similar problems with my Intel 7260 wifi and did some research on how to fix these issues.
It turns out that lots of people have problems with this wifi card and its related driver the iwlwifi. However, it seems there is no easy apply and forget fix as people are reporting different problems (also due to different APs being used of course). Hence, some testing is has to be done.
The following links should be helpful:
I found several related bug reports on launchpad, see here, here, here, and here.
Furthermore, on the Archwiki there is a useful troubleshooting section for the iwlwifi driver.
Last but not least here is also a brief summary on how to fix iwlwifi related problems.
Some suggested solutions are:
In my case the stability problems were coming from frequent disconnects showing up in the syslog (-> dmesg) as follows:
I am running Ubuntu 15.04 (x64) with a 3.19 Linux kernel.
In my case it seems that the problems are fixed just by turning on link aggregation (11n_disable=8). Turning off power saving also seems to help. This holds for the 2.4GHz network.
For the 5GHz network I could not solve the problems and the link is highly unstable.
For how to turn off wifi power management permanently see here and here.