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I recently faced this problem with my wireless home network. From wifi speed tests on other devices, I expect to get 6Mb/s, while on my laptop with 22.04 (Linux 5.15.0-40-generic) the speed ranges from 100kb/s to 1Mb/s at best. I can't test on ethernet at the moment, and I am always close to the router. I would expect to get the same speed I see on other devices, and that my provider guarantees I do have at the moment.

I tried changing the PC power settings to maximal performance, but I observed no improvement. I also spent a couple of weekends trying some solutions reported here and elsewhere, excluding the complex ones like kernel updates. However, nothing worked.

I also noticed that on dual-booted Windows install on the same PC I get a better connection (maybe not a hardware issue?). Oddly enough, when I connect with Ubuntu 22.04 to the very same provider with wifi in my student house elsewhere, everything works smoothly. I tried to change the router, and still no improvement. Also, this problem seems to have emerged in U22, as I didn't notice this in 20!

Maybe someone can suggest the possible culprit? I am clueless!

EDIT: I might have found the problem, and it's weird. When multiple USB/USB-C/HDMI adapters are in use, at some point the wifi speed drops. Oddly, if I keep the lid of the laptop open, the problem is mitigated. Maybe there could be a better strategy to address this, but for the moment it works.

Below is the information on my system.

sudo lshw -C network
  *-network
       description: Wireless interface
       product: Cannon Point-LP CNVi [Wireless-AC]
       vendor: Intel Corporation
       physical id: 14.3
       bus info: pci@0000:00:14.3
       logical name: wlo1
       version: 30
       serial: 18:56:80:68:f1:32
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=iwlwifi driverversion=5.15.0-40-generic firmware=46.fae53a8b.0 9000-pu-b0-jf-b0- ip=192.168.0.103 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:16 memory:a4414000-a4417fff

susb


Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 002: ID 2109:0813 VIA Labs, Inc. VL813 Hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 008: ID 1ea7:0064 SHARKOON Technologies GmbH 2.4GHz Wireless rechargeable vertical mouse [More&Better]
Bus 001 Device 005: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 003: ID 06cb:009b Synaptics, Inc.
Bus 001 Device 010: ID 8087:0aaa Intel Corp. Bluetooth 9460/9560 Jefferson Peak (JfP)
Bus 001 Device 006: ID 0c45:9510 Microdia USB Keyboard
Bus 001 Device 009: ID 2109:0100 VIA Labs, Inc. USB 2.0 BILLBOARD

Bus 001 Device 007: ID 046d:c077 Logitech, Inc. M105 Optical Mouse
Bus 001 Device 004: ID 14cd:8601 Super Top 4-Port hub
Bus 001 Device 002: ID 2109:2813 VIA Labs, Inc. VL813 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub



spci
00:00.0 Host bridge: Intel Corporation Coffee Lake HOST and DRAM Controller (rev 0b)
00:02.0 VGA compatible controller: Intel Corporation WhiskeyLake-U GT2 [UHD Graphics 620]
00:12.0 Signal processing controller: Intel Corporation Cannon Point-LP Thermal Controller (rev 30)
00:14.0 USB controller: Intel Corporation Cannon Point-LP USB 3.1 xHCI Controller (rev 30)
00:14.2 RAM memory: Intel Corporation Cannon Point-LP Shared SRAM (rev 30)
00:14.3 Network controller: Intel Corporation Cannon Point-LP CNVi [Wireless-AC] (rev 30)
00:15.0 Serial bus controller: Intel Corporation Cannon Point-LP Serial IO I2C Controller #0 (rev 30)
00:16.0 Communication controller: Intel Corporation Cannon Point-LP MEI Controller #1 (rev 30)
00:17.0 SATA controller: Intel Corporation Cannon Point-LP SATA Controller [AHCI Mode] (rev 30)
00:19.0 Serial bus controller: Intel Corporation Cannon Point-LP Serial IO I2C Host Controller (rev 30)
00:19.1 Serial bus controller: Intel Corporation Device 9dc6 (rev 30)
00:1c.0 PCI bridge: Intel Corporation Cannon Point-LP PCI Express Root Port #1 (rev f0)
00:1c.4 PCI bridge: Intel Corporation Cannon Point-LP PCI Express Root Port #5 (rev f0)
00:1d.0 PCI bridge: Intel Corporation Cannon Point-LP PCI Express Root Port #9 (rev f0)
00:1d.4 PCI bridge: Intel Corporation Cannon Point-LP PCI Express Root Port #13 (rev f0)
00:1f.0 ISA bridge: Intel Corporation Cannon Point-LP LPC Controller (rev 30)
00:1f.3 Audio device: Intel Corporation Cannon Point-LP High Definition Audio Controller (rev 30)
00:1f.4 SMBus: Intel Corporation Cannon Point-LP SMBus Controller (rev 30)
00:1f.5 Serial bus controller: Intel Corporation Cannon Point-LP SPI Controller (rev 30)
02:00.0 3D controller: NVIDIA Corporation GP107M [GeForce GTX 1050 Mobile] (rev a1)
03:00.0 USB controller: ASMedia Technology Inc. ASM2142 USB 3.1 Host Controller
04:00.0 Non-Volatile memory controller: Sandisk Corp WD Blue SN500 / PC SN520 NVMe SSD (rev 01)



ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enx4865ee146e8d: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 48:65:ee:14:6e:8d brd ff:ff:ff:ff:ff:ff
3: wlo1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DORMANT group default qlen 1000
    link/ether 18:56:80:68:f1:32 brd ff:ff:ff:ff:ff:ff
    altname wlp0s20f3
4: gpd0: <POINTOPOINT,MULTICAST,NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 500
    link/none
5: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN mode DEFAULT group default
    link/ether 02:42:b7:35:d1:01 brd ff:ff:ff:ff:ff:ff
Gian
  • 139

2 Answers2

3

I was facing the same problem. After trying lots of suggestions on different sites, one that worked for me:-

Go into the Wifi setting and disable IPv6(The default is automatic).

As my router was automatically switching from IPv4 to IPv6 & Ipv6 was causing problems in my scenario.

Yogesh Yadav
  • 173
1

EDIT: I finally pinned down this as a problem with using HDMI and USB-C simultaneously. My machine couldn't handle it. I solved it using a USB-C adapter with HDMI and every other port I needed. Troubleshooting this was hell.

In my case, the issue was pretty unpredictable. It had to do with how many USB ports I was using. I am not sure how I got there, but having multiple stuff attached to the laptop (mouse dongle, keyboard, USB-C adapter, etc.) was somehow draining too much power, even when plugged in. I resolved to remove anything that was not strictly necessary, and it worked again as expected.

Community
  • 1
Gian
  • 139