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#1 2021-09-12 16:14:48

uberben
Member
Registered: 2010-08-18
Posts: 58

Very slow wifi with AX210 based PCI-E card

I just installed an Intel AX210 based PCI-E wifi 6E card in my Arch Linux desktop. I have never had a wifi card in this computer before (I used to have a wired connection, but I just moved and won't be able to run cables for a while). It got picked up right away, but the connection was awful. I worked through the `iwlwifi` section of the networking wiki (https://wiki.archlinux.org/title/Networ … ss#iwlwifi) and disabling 802.11n got the connection to stop dropping packets, but my internet download speed is less than 10% of what it should be, (and less than 10% of what the same speed test from my phone on the same wifi network shows). Upload is fine. Changing software crypto and bluetooth coexistence had no effect. Setting `11n_disable=8` for antenna aggregation enabled 802.11n again and caused me to drop about 90% of packets.

I've also installed `linux-lts` and `linux-zen` kernels to try them out, but in both of those the wifi card doesn't even show up. Maybe AX210 support is too new for the iwlwifi version in those older kernels?

I'm currently trying to install `linux-firmware-iwlwifi-git` to see if that helps, but due to the slow download speed it is taking some time.

uname -a
Linux new-bendesktop 5.14.2-arch1-2 #1 SMP PREEMPT Thu, 09 Sep 2021 09:42:35 +0000 x86_64 GNU/Linux
lscpi -v
03:00.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 41) (prog-if 01 [Subtractive decode])
        Flags: bus master, fast devsel, latency 0, IRQ 11
        Bus: primary=03, secondary=04, subordinate=04, sec-latency=32
        I/O behind bridge: [disabled]
        Memory behind bridge: [disabled]
        Prefetchable memory behind bridge: [disabled]
        Capabilities: [90] Power Management version 2
        Capabilities: [a0] Subsystem: Gigabyte Technology Co., Ltd Device 8892
lshw -C network
*-network
       description: Wireless interface
       product: Wi-Fi 6 AX210/AX211/AX411 160MHz
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlp2s0
       version: 1a
       serial: 14:18:c3:47:79:b2
       width: 64 bits
       clock: 33MHz
       capabilities: bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=5.14.2-arch1-2 firmware=63.c04f3485.0 ty-a0-gf-a0-63.uc ip=192.168.1.145 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:16 memory:d0900000-d0903fff
iw dev wlp2s0 link
Connected to c4:41:1e:fa:c0:25 (on wlp2s0)
        SSID: good-old-wifi
        freq: 2457
        RX: 192664678 bytes (321245 packets)
        TX: 70216955 bytes (260417 packets)
        signal: -64 dBm
        rx bitrate: 1.0 MBit/s
        tx bitrate: 54.0 MBit/s

        bss flags:      short-preamble short-slot-time
        dtim period:    1
        beacon int:     100

As an aside, I have a Linksys AX3200 as my router. I am unable to see the 5GHz network with this AX210 card. It is visible on my phone in the same room, though the signal strength appears low.

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#2 2021-09-12 19:56:41

uberben
Member
Registered: 2010-08-18
Posts: 58

Re: Very slow wifi with AX210 based PCI-E card

`linux-firmware-iwlwifi-git` has not helped.

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#3 2021-09-12 20:06:25

seth
Member
Registered: 2012-09-03
Posts: 23,309

Re: Very slow wifi with AX210 based PCI-E card

The signal isn't great - can you move the system closer to the AP (not immediately, but we might get there - the disparity might stem from the chip ramping up the TX power to yell at your AP, but the latter just whispering all the time)

The two things interesting before are
1. station dump, https://wiki.archlinux.org/title/Networ … _interface
2. system journal / dmesg (notably whether there're constant re-connects and/or firmware crashes - though because of the ok TX, that's probably not an issue)

Do you actually use bluetooth (ie. is there some device connecting to BT) or could you in doubt rfkill it?

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#4 2021-09-12 20:53:56

uberben
Member
Registered: 2010-08-18
Posts: 58

Re: Very slow wifi with AX210 based PCI-E card

Moving the PC closer to the router is tough, but I probably a long enough ethernet cable to temporarily move the router closer to the PC. I'll have to find the right box with my cables later today or tomorrow to try that.

1. station dump:

Station c4:41:1e:fa:c0:25 (on wlp2s0)
        inactive time:  54 ms
        rx bytes:       15453080
        rx packets:     66177
        tx bytes:       15719530
        tx packets:     70651
        tx retries:     5487
        tx failed:      7
        beacon loss:    0
        beacon rx:      89836
        rx drop misc:   64
        signal:         -63 [-63, -64] dBm
        signal avg:     -64 dBm
        beacon signal avg:      -59 dBm
        tx bitrate:     54.0 MBit/s
        tx duration:    0 us
        rx bitrate:     6.0 MBit/s
        rx duration:    0 us
        authorized:     yes
        authenticated:  yes
        associated:     yes
        preamble:       long
        WMM/WME:        yes
        MFP:            yes
        TDLS peer:      no
        DTIM period:    1
        beacon interval:100
        short preamble: yes
        short slot time:yes
        connected time: 9295 seconds
        associated at [boottime]:       2412.031s
        associated at:  1631469393945 ms
        current time:   1631478688385 ms

2a. journalctl -b -0: https://termbin.com/0gfa
2b. dmesg: https://termbin.com/4l5s

I'm seeing some messages in there about eno1, my ethernet connection. I've got a cable plugged into the PC but nothing on the other end, not sure if that is related and accessing the PC to remove it takes a few minutes. I've also got the ethernet disabled in the Gnome settings panel.

I'm also seeing a warning message in dmesg about the wifi driver with a call trace, but I'm not really sure what to do with that.

One of the main reasons I got this card was to use bluetooth headphones after I've got an ethernet wire run to the router. For the sake of testing though, I've run `rfkill block bluetooth`, confirmed my headphones cannot connect, and rerun a speed test. I'm still seeing slow download speeds and decent upload speeds.

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#5 2021-09-13 16:05:15

seth
Member
Registered: 2012-09-03
Posts: 23,309

Re: Very slow wifi with AX210 based PCI-E card

I don't suspect the missing ethernet carrier to cause any interference here (though as long as it's disabled NM should probably not be banging it all the time)
There's no crashing firmware, nor other frequent disconnects and you ruled out BT interference, so the one thing I see remaining is that the upstream signal is stronger than the downstream signal.
Maybe you can increase the TX power in the router?

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#6 2021-09-13 18:19:21

uberben
Member
Registered: 2010-08-18
Posts: 58

Re: Very slow wifi with AX210 based PCI-E card

It seems the stock firmware cannot adjust TX power, though I was thinking of installing OpenWRT at some point down the road.

I have moved the router so it is in the room directly below the PC and the speeds have improved (~15Mb/s instead of the ~1Mb/s I was seeing before), but still not great. My phone on the same 2.4GHz SSID in the same room (about 1 foot from the PC's antennas) gets 60Mb/s.

I'm starting to think I just got a low quality wifi card.

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#7 2021-09-13 19:05:22

progandy
Member
Registered: 2012-05-17
Posts: 4,517

Re: Very slow wifi with AX210 based PCI-E card

Are the antennas it comes with any good / connected properly?


| alias CUTF='LANG=en_XX.UTF-8@POSIX ' |

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#8 2021-09-13 19:52:33

uberben
Member
Registered: 2010-08-18
Posts: 58

Re: Very slow wifi with AX210 based PCI-E card

I believe they are connected okay. Hard to say about the quality - I'll see if I've got any old routers I can scavenge an antenna from for testing.

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#9 2021-09-14 03:21:27

uberben
Member
Registered: 2010-08-18
Posts: 58

Re: Very slow wifi with AX210 based PCI-E card

I found an old D-Link router with external antennas. Swapping them out I see very similar speeds to the card's stock antennas. I also tried removing the antennas completely and am seeing the same speeds, so maybe there is something defective about the card's antenna connections internally?

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#10 2021-09-14 21:43:09

uberben
Member
Registered: 2010-08-18
Posts: 58

Re: Very slow wifi with AX210 based PCI-E card

Customer support said they would ship me out a new one. I'll come back to this thread if I'm still having issues with the replacement.

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