very slow/intermittent wifi on laptop

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J_Couch
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very slow/intermittent wifi on laptop

Post by J_Couch » Sun Aug 11, 2019 11:22 pm

hello -- For the last week or so my Mint 18.1 Cinnamon installation on my ThinkPad has had extremely slow wifi which occasionally speeds up. The wifi works fine for all my other devices.

Following the advice on this thread, viewtopic.php?t=239854 I disabled Power Management and (I think) speed up the Intel wireless chipset. After rebooting, however, the very slow wifi persists.

When I do iwconfig, this is what I get:

~ $ iwconfig
tun0 no wireless extensions.
lo no wireless extensions.
enp0s31f6 no wireless extensions.

wlp4s0 IEEE 802.11abgn ESSID:"F9ZV2"
Mode:Managed Frequency:2.437 GHz Access Point: 18:1B:EB:09:4B:4D
Bit Rate=130 Mb/s Tx-Power=22 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=63/70 Signal level=-47 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:166 Missed beacon:0


Any ideas for what's wrong? Thanks

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kc1di
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Re: very slow/intermittent wifi on laptop

Post by kc1di » Mon Aug 12, 2019 6:47 am

Please go to a terminal and type this code and post the output here:

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inxi -Nn
and also

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lspci -nnk | grep -iA3 net
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J_Couch
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Re: very slow/intermittent wifi on laptop

Post by J_Couch » Mon Aug 12, 2019 10:06 am

posting "inxi -Nn" returns this:

Card-1: Intel Ethernet Connection I219-LM driver: e1000e
IF: enp0s31f6 state: down mac: 54:ee:75:c1:7f:0e
Card-2: Intel Wireless 8260 driver: iwlwifi
IF: wlp4s0 state: up mac: f4:8c:50:0c:17:1e

and "lspci -nnk | grep -iA3 net" returns this:

00:1f.6 Ethernet controller [0200]: Intel Corporation Ethernet Connection I219-LM [8086:156f] (rev 21)
Subsystem: Lenovo Ethernet Connection I219-LM [17aa:2233]
Kernel driver in use: e1000e
Kernel modules: e1000e
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader [10ec:525a] (rev 01)
--
04:00.0 Network controller [0280]: Intel Corporation Wireless 8260 [8086:24f3] (rev 3a)
Subsystem: Intel Corporation Wireless 8260 [8086:0130]
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi


thanks for taking a look!

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kc1di
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Re: very slow/intermittent wifi on laptop

Post by kc1di » Mon Aug 12, 2019 4:14 pm

The outputs look ok.
Are you in a heavy use area. That is are there a lot of others using wifi around you?
if so you'll want to set your router to use the least populated channel possible.
the more people on a channel the great the slow down.
If Power management is of that is good.
Each router is different about how to change the channel so you'll have to look up for yours either in the manual or online.

I suggest channels 1,6 and 11 pick the one that is the least busy.
if our not sure install linssid

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sudo apt install linssid
once install run it from the terminal with this command

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sudo linssid
the scan may take some minutes. And not all wireless cards allow scanning so it may not work.

good luck.
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kelebek333
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Re: very slow/intermittent wifi on laptop

Post by kelebek333 » Mon Aug 12, 2019 5:42 pm

You can try following command. You must reboot your PC after command.

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echo "options iwlwifi 11n_disable=8 swcrypto=1 bt_coex_active=0" | sudo tee /etc/modprobe.d/iwlwifi.conf
You can look output of the following command for what these variables mean.

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modinfo iwlwifi
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: bt_coex_active:enable wifi/bt co-exist (default: enable) (bool)

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