Slow wifi with low signal strength

tyger108 · 2014-08-07 11:15:43

Hello, this is my first post also just finished building my first Arch system and love it! Except that if I am not very close like within 15 feet of a Wireless router the signal strength is too low to maintain a connection. I switched from network manager to wicd and that seemed to help a little but something else is causing a problem because it is not near where it should be.

$ uname -a
Linux Yoda 3.15.8-1-ARCH #1 SMP PREEMPT Fri Aug 1 08:51:42 CEST 2014 x86_64 GNU/Linux

# truncated and not currently connected
$ ip addr
3: wlp4s0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether a0:88:69:0c:87:67 brd ff:ff:ff:ff:ff:ff

$ lspci | grep Wi
04:00.0 Network controller: Intel Corporation Wireless 3160 (rev 83)

$ lspci -vv -s 04:00.0
04:00.0 Network controller: Intel Corporation Wireless 3160 (rev 83)
	Subsystem: Intel Corporation Dual Band Wireless-AC 3160
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 50
	Region 0: Memory at f7d00000 (64-bit, non-prefetchable) [size=8K]
	Capabilities: <access denied>
	Kernel driver in use: iwlwifi
	Kernel modules: iwlwifi

$ iwconfig wlp4s0
wlp4s0    IEEE 802.11abgn  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=0 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on

That's about as good as I can do without some guidance from the experts. I researched this a-lot and have decided to resort to this forum for the first time. I will greatly appreciate any help because this is my work laptop and I don't always have an Ethernet.

ooo · 2014-08-07 13:29:32

Have you tried if the results are same on another OS on same computer or different computers using the same wlan network?

one thing you could try is disabling hardware crypto for that device. I think I've read some people reporting wifi slowness that can be resolved by using software crypto.

# /etc/modprobe.d/iwlwifi.conf
options iwlwifi swcrypto=1

This page has a few tips that could improve performance with low signal wifi.

lahwaacz · 2014-08-07 14:48:44

See also Wireless network configuration on our wiki.

tyger108 · 2014-08-07 18:01:02

It is defiantly a problem with my machine. I had Ubuntu 13.10 and it worked fine. I then upgraded to 14.04 and experienced the same problem with Ubuntu. Many computers can access the networks I am testing on just fine and this machine could too before.

I just tried using software Crypto and disabling disable 802.11n as well as turning off wifi power saving to no avail

One thing I noticed is that during boot up both WICD and network manger say they are starting up even though I disabled network manager. Once it boots and I log in if I check the daemon statuses only wicd is running.

Last edited by tyger108 (2014-08-07 18:02:01)

ooo · 2014-08-07 18:44:24

You could also try if linux-lts doesn't have this problem

tyger108 · 2014-08-07 20:30:16

Thank you for the suggestions all. Linux-lts is a no go as well unfortunately.

Pse · 2014-08-08 02:33:31

If this worked on Ubuntu 13.10 and then deteriorated with 14.04 (and Arch) it definitely looks like a regression. Have you looked for reports from other users of your wireless card/chipset in the kernel mailing list?

tyger108 · 2014-08-08 11:08:29

Wow who knew wifi problems would teach me this much. Ok so I think the kernel isn't able to load the correct firmware. Intel recommends iwlwifi-3160-8.ucode for my card. However modinfo reveals its not loaded

$ modinfo iwlwifi
filename:       /lib/modules/3.15.8-1-ARCH/kernel/drivers/net/wireless/iwlwifi/iwlwifi.ko.gz
license:        GPL
author:         Copyright(c) 2003- 2014 Intel Corporation <ilw@linux.intel.com>
version:        in-tree:
description:    Intel(R) Wireless WiFi driver for Linux
firmware:       iwlwifi-100-5.ucode
firmware:       iwlwifi-1000-5.ucode
firmware:       iwlwifi-135-6.ucode
firmware:       iwlwifi-105-6.ucode
firmware:       iwlwifi-2030-6.ucode
firmware:       iwlwifi-2000-6.ucode
firmware:       iwlwifi-5150-2.ucode
firmware:       iwlwifi-5000-5.ucode
firmware:       iwlwifi-6000g2b-6.ucode
firmware:       iwlwifi-6000g2a-5.ucode
firmware:       iwlwifi-6050-5.ucode
firmware:       iwlwifi-6000-4.ucode
firmware:       iwlwifi-7265-8.ucode
firmware:       iwlwifi-3160-8.ucode
firmware:       iwlwifi-7260-8.ucode
firmware:       iwlwifi-8000-8.ucode
srcversion:     4945CD348D3CF87465A769B
alias:          pci:v00008086d000024F4sv*sd00000030bc*sc*i*
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alias:          pci:v00008086d000008B1sv*sd00005070bc*sc*i*
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alias:          pci:v00008086d000008B1sv*sd0000486Ebc*sc*i*
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alias:          pci:v00008086d000008B1sv*sd00004470bc*sc*i*
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alias:          pci:v00008086d000008B2sv*sd00004270bc*sc*i*
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alias:          pci:v00008086d000008B1sv*sd00004062bc*sc*i*
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alias:          pci:v00008086d000008B1sv*sd00004060bc*sc*i*
alias:          pci:v00008086d000008B1sv*sd00004170bc*sc*i*
alias:          pci:v00008086d000008B1sv*sd00004072bc*sc*i*
alias:          pci:v00008086d000008B1sv*sd00004070bc*sc*i*
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alias:          pci:v00008086d00000894sv*sd00000822bc*sc*i*
alias:          pci:v00008086d00000894sv*sd00000422bc*sc*i*
alias:          pci:v00008086d00000895sv*sd00000222bc*sc*i*
alias:          pci:v00008086d00000894sv*sd00000022bc*sc*i*
alias:          pci:v00008086d0000088Fsv*sd00005260bc*sc*i*
alias:          pci:v00008086d0000088Esv*sd00004860bc*sc*i*
alias:          pci:v00008086d0000088Esv*sd0000446Abc*sc*i*
alias:          pci:v00008086d0000088Esv*sd00004460bc*sc*i*
alias:          pci:v00008086d0000088Fsv*sd0000426Abc*sc*i*
alias:          pci:v00008086d0000088Fsv*sd00004260bc*sc*i*
alias:          pci:v00008086d0000088Esv*sd0000406Abc*sc*i*
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alias:          pci:v00008086d00000890sv*sd00004822bc*sc*i*
alias:          pci:v00008086d00000890sv*sd00004422bc*sc*i*
alias:          pci:v00008086d00000891sv*sd00004222bc*sc*i*
alias:          pci:v00008086d00000890sv*sd00004022bc*sc*i*
alias:          pci:v00008086d00000896sv*sd00005027bc*sc*i*
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alias:          pci:v00008086d00000885sv*sd00001325bc*sc*i*
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alias:          pci:v00008086d00000885sv*sd00001305bc*sc*i*
alias:          pci:v00008086d00000089sv*sd00001316bc*sc*i*
alias:          pci:v00008086d00000089sv*sd00001311bc*sc*i*
alias:          pci:v00008086d00000087sv*sd00001326bc*sc*i*
alias:          pci:v00008086d00000087sv*sd00001321bc*sc*i*
alias:          pci:v00008086d00000087sv*sd00001306bc*sc*i*
alias:          pci:v00008086d00000087sv*sd00001301bc*sc*i*
alias:          pci:v00008086d00000091sv*sd00005226bc*sc*i*
alias:          pci:v00008086d00000091sv*sd00005225bc*sc*i*
alias:          pci:v00008086d00000091sv*sd00005221bc*sc*i*
alias:          pci:v00008086d00000091sv*sd00005207bc*sc*i*
alias:          pci:v00008086d00000091sv*sd00005206bc*sc*i*
alias:          pci:v00008086d00000091sv*sd00005205bc*sc*i*
alias:          pci:v00008086d00000091sv*sd00005201bc*sc*i*
alias:          pci:v00008086d00000090sv*sd00005216bc*sc*i*
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alias:          pci:v00008086d00000085sv*sd0000C220bc*sc*i*
alias:          pci:v00008086d00000082sv*sd0000C020bc*sc*i*
alias:          pci:v00008086d00000085sv*sd00001316bc*sc*i*
alias:          pci:v00008086d00000085sv*sd00001318bc*sc*i*
alias:          pci:v00008086d00000085sv*sd00001311bc*sc*i*
alias:          pci:v00008086d00000082sv*sd00001328bc*sc*i*
alias:          pci:v00008086d00000082sv*sd00001326bc*sc*i*
alias:          pci:v00008086d00000082sv*sd00001321bc*sc*i*
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alias:          pci:v00008086d00000082sv*sd00001307bc*sc*i*
alias:          pci:v00008086d00000082sv*sd00001306bc*sc*i*
alias:          pci:v00008086d00000082sv*sd00001301bc*sc*i*
alias:          pci:v00008086d00004239sv*sd00001316bc*sc*i*
alias:          pci:v00008086d00004239sv*sd00001311bc*sc*i*
alias:          pci:v00008086d00004238sv*sd00001118bc*sc*i*
alias:          pci:v00008086d00004238sv*sd00001111bc*sc*i*
alias:          pci:v00008086d0000422Csv*sd00001326bc*sc*i*
alias:          pci:v00008086d0000422Csv*sd00001321bc*sc*i*
alias:          pci:v00008086d0000422Csv*sd00001307bc*sc*i*
alias:          pci:v00008086d0000422Csv*sd00001306bc*sc*i*
alias:          pci:v00008086d0000422Csv*sd00001301bc*sc*i*
alias:          pci:v00008086d0000422Bsv*sd00001128bc*sc*i*
alias:          pci:v00008086d0000422Bsv*sd00001121bc*sc*i*
alias:          pci:v00008086d0000422Bsv*sd00001108bc*sc*i*
alias:          pci:v00008086d0000422Bsv*sd00001101bc*sc*i*
alias:          pci:v00008086d0000423Dsv*sd00001316bc*sc*i*
alias:          pci:v00008086d0000423Dsv*sd00001216bc*sc*i*
alias:          pci:v00008086d0000423Dsv*sd00001311bc*sc*i*
alias:          pci:v00008086d0000423Dsv*sd00001211bc*sc*i*
alias:          pci:v00008086d0000423Csv*sd00001326bc*sc*i*
alias:          pci:v00008086d0000423Csv*sd00001321bc*sc*i*
alias:          pci:v00008086d0000423Csv*sd00001221bc*sc*i*
alias:          pci:v00008086d0000423Csv*sd00001306bc*sc*i*
alias:          pci:v00008086d0000423Csv*sd00001206bc*sc*i*
alias:          pci:v00008086d0000423Csv*sd00001301bc*sc*i*
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alias:          pci:v00008086d0000423Bsv*sd00001011bc*sc*i*
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alias:          pci:v00008086d0000423Asv*sd00001001bc*sc*i*
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alias:          pci:v00008086d00004236sv*sd00001011bc*sc*i*
alias:          pci:v00008086d00004235sv*sd00001104bc*sc*i*
alias:          pci:v00008086d00004235sv*sd00001004bc*sc*i*
alias:          pci:v00008086d00004235sv*sd00001101bc*sc*i*
alias:          pci:v00008086d00004235sv*sd00001001bc*sc*i*
alias:          pci:v00008086d00004235sv*sd00001124bc*sc*i*
alias:          pci:v00008086d00004235sv*sd00001024bc*sc*i*
alias:          pci:v00008086d00004235sv*sd00001121bc*sc*i*
alias:          pci:v00008086d00004235sv*sd00001021bc*sc*i*
alias:          pci:v00008086d00004237sv*sd00001316bc*sc*i*
alias:          pci:v00008086d00004237sv*sd00001216bc*sc*i*
alias:          pci:v00008086d00004237sv*sd00001315bc*sc*i*
alias:          pci:v00008086d00004237sv*sd00001215bc*sc*i*
alias:          pci:v00008086d00004237sv*sd00001314bc*sc*i*
alias:          pci:v00008086d00004237sv*sd00001214bc*sc*i*
alias:          pci:v00008086d00004237sv*sd00001311bc*sc*i*
alias:          pci:v00008086d00004237sv*sd00001211bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001326bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001226bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001325bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001225bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001324bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001224bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001321bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001221bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001306bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001206bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001305bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001205bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001304bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001204bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001301bc*sc*i*
alias:          pci:v00008086d00004232sv*sd00001201bc*sc*i*
depends:        cfg80211
intree:         Y
vermagic:       3.15.8-1-ARCH SMP preempt mod_unload modversions 
parm:           swcrypto:using crypto in software (default 0 [hardware]) (int)
parm:           11n_disable:disable 11n functionality, bitmap: 1: full, 2: disable agg TX, 4: disable agg RX, 8 enable agg TX (uint)
parm:           amsdu_size_8K:enable 8K amsdu size (default 0) (int)
parm:           fw_restart:restart firmware in case of error (default true) (bool)
parm:           antenna_coupling:specify antenna coupling in dB (defualt: 0 dB) (int)
parm:           wd_disable:Disable stuck queue watchdog timer 0=system default, 1=disable (default: 1) (int)
parm:           nvm_file:NVM file name (charp)
parm:           bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)
parm:           led_mode:0=system default, 1=On(RF On)/Off(RF Off), 2=blinking, 3=Off (default: 0) (int)
parm:           power_save:enable WiFi power management (default: disable) (bool)
parm:           power_level:default power save level (range from 1 - 5, default: 1) (int)

And there is no mention of that firmware as being loaded. I do have it in my system though.

$ ls /lib/firmware/ | grep wifi
iwlwifi-1000-3.ucode
iwlwifi-1000-5.ucode
iwlwifi-100-5.ucode
iwlwifi-105-6.ucode
iwlwifi-135-6.ucode
iwlwifi-2000-6.ucode
iwlwifi-2030-6.ucode
iwlwifi-3160-7.ucode
iwlwifi-3160-8.ucode
iwlwifi-3160-9.ucode
iwlwifi-3945-2.ucode
iwlwifi-4965-2.ucode
iwlwifi-5000-1.ucode
iwlwifi-5000-2.ucode
iwlwifi-5000-5.ucode
iwlwifi-5150-2.ucode
iwlwifi-6000-4.ucode
iwlwifi-6000g2a-5.ucode
iwlwifi-6000g2a-6.ucode
iwlwifi-6000g2b-5.ucode
iwlwifi-6000g2b-6.ucode
iwlwifi-6050-4.ucode
iwlwifi-6050-5.ucode
iwlwifi-7260-7.ucode
iwlwifi-7260-8.ucode
iwlwifi-7260-9.ucode
iwlwifi-7265-8.ucode
iwlwifi-7265-9.ucode
rtlwifi

https://bbs.archlinux.org/viewtopic.php?id=178458

Arch Linux

#1 2014-08-07 11:15:43

Slow wifi with low signal strength

#2 2014-08-07 13:29:32

Re: Slow wifi with low signal strength

#3 2014-08-07 14:48:44

Re: Slow wifi with low signal strength

#4 2014-08-07 18:01:02

Re: Slow wifi with low signal strength

#5 2014-08-07 18:44:24

Re: Slow wifi with low signal strength

#6 2014-08-07 20:30:16

Re: Slow wifi with low signal strength

#7 2014-08-08 02:33:31

Re: Slow wifi with low signal strength

#8 2014-08-08 11:08:29

Re: Slow wifi with low signal strength

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