[SOLVED] slow wifi download speed w/Qualcomm Atheros AR9485 adapter

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Tenacious-Qi
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[SOLVED] slow wifi download speed w/Qualcomm Atheros AR9485 adapter

Post by Tenacious-Qi » Mon Aug 12, 2019 3:02 am

Hello all, I've been googling and tried a few different solutions but no fix yet. I looked at this post: viewtopic.php?t=272234 with the same wifi card as me but their problem was different. My card is recognized it's just that the DL speed is super slow. Today I realized my download speeds were slow on my laptop but much faster on my phone. This is a bummer as I really like linux mint otherwise. I recently migrated from windows where I didn't have problems with DL speed although on windows it would often disconnect and reconnect which makes me think hardware. No disconnect and reconnect issues so far on linux. Any help greatly appreciated. I am very much a beginner.

Model = Dell Inspiron 3531, no ethernet port.

Wifi adapter
= qualcom atheros.

Speedtest.net DL speed on LAPTOP: 1.41 Mbps Download/ 5.00 Mbps Upload.

Speedtest.net DL speed on phone: 20.1 Mbps Download/ 5.43 Mbps Upload.

Things I've tried:

1. Changing kernel from 4.15.0-55 to the newest 5.0.0-23.
2. Changing kernel from 5.0.0-23 to 4.18.0-25
3. All but the last three solutions listed here: https://itsfoss.com/speed-up-slow-wifi- ... on-ubuntu/ as they didn't really seem relevant but maybe I'm wrong?

Code: Select all

[b]sudo lshw -C network[/b]
  *-network                 
       description: Wireless interface
       product: AR9485 Wireless Network Adapter
       vendor: Qualcomm Atheros
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlp2s0
       version: 01
       serial: c0:38:96:86:42:d7
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
       configuration: broadcast=yes driver=ath9k driverversion=4.18.0-25-generic firmware=N/A ip=192.168.1.53 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:17 memory:90400000-9047ffff memory:90480000-9048ffff

Code: Select all

inxi -Fxz
System:
  Host: joe-pc Kernel: 4.18.0-25-generic x86_64 bits: 64 compiler: gcc 
  v: 7.4.0 Desktop: Cinnamon 4.2.3 Distro: Linux Mint 19.2 Tina 
  base: Ubuntu 18.04 bionic 
Machine:
  Type: Portable System: Dell product: Inspiron 3531 v: A03 serial: <filter> 
  Mobo: Dell model: 00FTTX v: A00 serial: <filter> UEFI: Dell v: A03 
  date: 07/30/2014 
Battery:
  ID-1: BAT1 charge: 21.9 Wh condition: 21.9/41.4 Wh (53%) 
  model: SIMPLO DELL FW1MN413 status: Full 
CPU:
  Topology: Dual Core model: Intel Celeron N2830 bits: 64 type: MCP 
  arch: Silvermont rev: 8 L2 cache: 1024 KiB 
  flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 8663 
  Speed: 1037 MHz min/max: 500/2416 MHz Core speeds (MHz): 1: 965 2: 896 
Graphics:
  Device-1: Intel Atom Processor Z36xxx/Z37xxx Series Graphics & Display 
  vendor: Dell driver: i915 v: kernel bus ID: 00:02.0 
  Display: x11 server: X.Org 1.19.6 driver: modesetting unloaded: fbdev,vesa 
  resolution: 1366x768~60Hz 
  OpenGL: renderer: Mesa DRI Intel Bay Trail v: 4.2 Mesa 19.0.2 
  direct render: Yes 
Audio:
  Device-1: Intel Atom Processor Z36xxx/Z37xxx Series High Definition Audio 
  vendor: Dell driver: snd_hda_intel v: kernel bus ID: 00:1b.0 
  Sound Server: ALSA v: k4.18.0-25-generic 
Network:
  Device-1: Qualcomm Atheros AR9485 Wireless Network Adapter vendor: Dell 
  driver: ath9k v: kernel port: 1000 bus ID: 02:00.0 
  IF: wlp2s0 state: up mac: <filter> 
Drives:
  Local Storage: total: 232.89 GiB used: 131.02 GiB (56.3%) 
  ID-1: /dev/sda vendor: Crucial model: CT250MX500SSD1 size: 232.89 GiB 
  temp: 36 C 
Partition:
  ID-1: / size: 227.74 GiB used: 131.01 GiB (57.5%) fs: ext4 dev: /dev/sda2 
Sensors:
  System Temperatures: cpu: 50.0 C mobo: N/A 
  Fan Speeds (RPM): cpu: 0 
Info:
  Processes: 201 Uptime: 12m Memory: 7.68 GiB used: 1.63 GiB (21.2%) 
  Init: systemd runlevel: 5 Compilers: gcc: 7.4.0 Shell: bash v: 4.4.20 
  inxi: 3.0.32 
Last edited by Tenacious-Qi on Mon Aug 12, 2019 7:48 pm, edited 1 time in total.

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kelebek333
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Re: Slow wifi download speed w/Qualcomm Atheros AR9485 adapter

Post by kelebek333 » Mon Aug 12, 2019 6:19 pm

Did you change power mangement of network manager?

https://easylinuxtipsproject.blogspot.c ... html#ID2.1

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Oldun
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Re: Slow wifi download speed w/Qualcomm Atheros AR9485 adapter

Post by Oldun » Mon Aug 12, 2019 7:35 pm

by kelebek333 » Tue Aug 13, 2019 8:19 am
Did you change power mangement of network manager?

https://easylinuxtipsproject.blogspot.c ... html#ID2.1


Worked for me both upload & download speeds increased by 50%. Give it a go :) :)
Lenovo T420 i5 Mint Cinnamon 19.1 Tessa (all spinning rust, none of this new fangled SSD stuff).

Tenacious-Qi
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Re: Slow wifi download speed w/Qualcomm Atheros AR9485 adapter

Post by Tenacious-Qi » Mon Aug 12, 2019 7:45 pm

Yes thank you. Power management is off:

Code: Select all

iwconfig
lo        no wireless extensions.

wlp2s0    IEEE 802.11  ESSID:"Tenacious Qi"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: AC:9E:17:8B:F8:C8   
          Bit Rate=72.2 Mb/s   Tx-Power=15 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=45/70  Signal level=-65 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:491   Missed beacon:0
I'm feeling embarrassed, as I am pretty sure this is just a symptom of being far away from my router (this is what happens when you overthink things!). I also think it's a hardware issue as my wifi antenna seems pretty weak, e.g. my girlfriend's 2010 macbook pro in the same far-away location gets full wifi bars and I only get two--her DL speed here upstairs was 8 Mbps and mine was 1.5 Mbps. When I go stand next to the router I get 40+Mbps (I think we pay for 60 Mbps).

One thing I'm confused about is why my upload speed doesn't seem to be affected by my distance to router. It's always around 5 Mbps even when a poor signal shoots my download speed to ~1Mbps. Anyways, I'll go ahead and mark this as solved. Carry on! Sorry I doubted you Linux Mint, you're just swell.

EDIT: Changed my Router's channel bandwidth to 20Mhz and set the channel to a lesser used one in my area, DL speeds back to normal I think!

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