Ubuntu 22.04.2 LTS unstable wifi, while windows on the same condition is stable and fast

Filipe Moreira

5/24/24, 8:37 PM

Possibly important outputs:

lspci -nnk | grep -A2 0280
01:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8821CE 802.11ac PCIe Wireless Network Adapter [10ec:c821]
    Subsystem: AzureWave RTL8821CE 802.11ac PCIe Wireless Network Adapter [1a3b:304b]
    Kernel driver in use: rtw_8821ce

sudo lshw -C network
  *-network                 
       description: Wireless interface
       product: RTL8821CE 802.11ac PCIe Wireless Network Adapter
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:01:00.0
       logical name: wlp1s0
       version: 00
       serial: 2c:3b:70:2f:0e:a7
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rtw_8821ce driverversion=5.19.0-42-generic firmware=N/A ip=192.168.1.115 latency=0 link=yes multicast=yes wireless=IEEE 802.11
       resources: irq:66 ioport:f000(size=256) memory:fcf00000-fcf0ffff

The wireless connection signal on Windows is really strong, while on Ubuntu it oscillates. I've tried all the options available here: https://itsfoss.com/speed-up-slow-wifi-connection-ubuntu/ and none of them worked. Whenever I test the wifi velocity it gives the same as Windows, but on Ubuntu it sometimes completely falls. It only happens on my router a TP-LINK Archer 7.

Is there a router setting to solve this?

155

0 + 2

wireless

realtek-wireless

22.04

waltinator

5/24/24, 10:24 PM

Look at the network logs with the terminal command: `sudo journalctl -b 0 -u NetworkManager`. Read `man journalctl`. What is your WiFi MTU? `ip link` will show. WiFi MTU should be 1492, not 1500. Easiest fix is done on your DHCP provider/router. Or, temporarily, `sudo ip link set dev name mtu 1492` where "name" is the interface name you found from `ip link`. For a fuller explanation see https://askubuntu.com/questions/1353705/ubuntu-20-04-wifi-keeps-dropping/1353723#1353723

chili555

5/25/24, 12:21 AM

Probable duplicate: https://askubuntu.com/questions/1438405/slow-internet-connection-on-ubuntu-20-04-5-lts-with-driver-rtw-8821ce Welcome to Ask Ubuntu.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Ubuntu 22.04.2 LTS unstable wifi, while windows on the same condition is stable and fast

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.