I have exactly the same behaviour with backport-iwlwifi-dkms and
AX1650i. Uninstalling the backport fixes the issue.
00:14.3 Network controller: Intel Corporation Killer Wi-Fi 6 AX1650i 160MHz
Wireless Network Adapter (201NGW) (rev 30)
Subsystem: Intel Corporation Killer Wi-Fi 6 AX1650i 160MHz Wireless
Network Adapter (201NGW)
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
Interrupt: pin A routed to IRQ 16
Region 0: Memory at 6057174000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
*-network
description: Wireless interface
product: Killer Wi-Fi 6 AX1650i 160MHz Wireless Network Adapter (201NGW)
vendor: Intel Corporation
physical id: 14.3
bus info: pci@0000:00:14.3
logical name: wlp0s20f3
version: 30
serial: 98:af:65:53:a1:33
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet
physical wireless
configuration: broadcast=yes driver=iwlwifi
driverversion=5.4.0-26-generic firmware=50.0d3a0ee9.0 ip=192.168.0.92 latency=0
link=yes multicast=yes wireless=IEEE 802.11
resources: iomemory:600-5ff irq:16 memory:6057174000-6057177fff
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https://bugs.launchpad.net/bugs/1874230
Title:
Intel Wireless 7265 [8086:095a] subsystem [8086:5110] WiFi is
extremely slow
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