Hi @niclasc,
I do not know what kernel version are you using, but you could post the output of inxi -Fazy on this post, in order to receieve help from the forum users.
Meanwhile, you could read the following post.
https://forum.manjaro.org/t/internet-has-become-very-slow-after-kernel-update/39320
Hope it help, regards.
I’ve tried Kernel 5.10, 5.9, 5.8 and 5.4 all with tha same problem. If I Boot of a Manjaro install iso then wifi works fine
inxi -Fazy
System:
Kernel: 5.10.0-1-MANJARO x86_64 bits: 64 compiler: gcc v: 10.2.0
parameters: BOOT_IMAGE=/boot/vmlinuz-5.10-x86_64
root=UUID=e553b735-da30-40dc-bb99-31eedc37c950 rw quiet udev.log_priority=3
Desktop: GNOME 3.38.1 tk: GTK 3.24.23 wm: gnome-shell dm: GDM 3.38.2
Distro: Manjaro Linux
Machine:
Type: Laptop System: Dell product: Latitude 7390 v: N/A serial: <filter>
Chassis: type: 10 serial: <filter>
Mobo: Dell model: 0MXW44 v: A03 serial: <filter> UEFI: Dell v: 1.16.0
date: 07/13/2020
Battery:
ID-1: BAT0 charge: 50.8 Wh condition: 50.8/60.0 Wh (85%) volts: 8.3/7.6
model: Samsung SDI DELL V49407C type: Li-ion serial: <filter> status: Full
CPU:
Info: Quad Core model: Intel Core i7-8650U bits: 64 type: MT MCP
arch: Kaby Lake family: 6 model-id: 8E (142) stepping: A (10) microcode: D6
L2 cache: 8192 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
bogomips: 33615
Speed: 800 MHz min/max: 400/4200 MHz Core speeds (MHz): 1: 800 2: 800 3: 800
4: 800 5: 800 6: 800 7: 800 8: 801
Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled
Type: l1tf
mitigation: PTE Inversion; VMX: conditional cache flushes, SMT vulnerable
Type: mds mitigation: Clear CPU buffers; SMT vulnerable
Type: meltdown mitigation: PTI
Type: spec_store_bypass
mitigation: Speculative Store Bypass disabled via prctl and seccomp
Type: spectre_v1
mitigation: usercopy/swapgs barriers and __user pointer sanitization
Type: spectre_v2 mitigation: Full generic retpoline, IBPB: conditional,
IBRS_FW, STIBP: conditional, RSB filling
Type: srbds mitigation: Microcode
Type: tsx_async_abort mitigation: Clear CPU buffers; SMT vulnerable
Graphics:
Device-1: Intel UHD Graphics 620 vendor: Dell driver: i915 v: kernel
bus ID: 00:02.0 chip ID: 8086:5917
Device-2: Microdia Integrated_Webcam_HD type: USB driver: uvcvideo
bus ID: 1-5:2 chip ID: 0c45:6717
Display: wayland server: X.Org 1.20.9 compositor: gnome-shell driver: nvidia
display ID: :0 screens: 1
Screen-1: 0 s-res: 4096x1440 s-dpi: 96 s-size: 1084x381mm (42.7x15.0")
s-diag: 1149mm (45.2")
Monitor-1: XWAYLAND0 res: 2560x1440 hz: 60 dpi: 108
size: 600x340mm (23.6x13.4") diag: 690mm (27.2")
Monitor-2: XWAYLAND1 res: 1536x864 hz: 60 dpi: 135
size: 290x170mm (11.4x6.7") diag: 336mm (13.2")
OpenGL: renderer: Mesa Intel UHD Graphics 620 (KBL GT2) v: 4.6 Mesa 20.2.3
direct render: Yes
Audio:
Device-1: Intel Sunrise Point-LP HD Audio vendor: Dell driver: snd_hda_intel
v: kernel alternate: snd_soc_skl bus ID: 00:1f.3 chip ID: 8086:9d71
Sound Server: ALSA v: k5.10.0-1-MANJARO
Network:
Device-1: Intel Ethernet I219-LM vendor: Dell driver: e1000e v: kernel
port: f040 bus ID: 00:1f.6 chip ID: 8086:15d7
IF: enp0s31f6 state: up speed: 1000 Mbps duplex: full mac: <filter>
Device-2: Intel Wireless 8265 / 8275 driver: iwlwifi v: kernel port: f040
bus ID: 02:00.0 chip ID: 8086:24fd
IF: wlp2s0 state: down mac: <filter>
Drives:
Local Storage: total: 248.01 GiB used: 70.08 GiB (28.3%)
SMART Message: Required tool smartctl not installed. Check --recommends
ID-1: /dev/sda type: USB vendor: Samsung model: SSD 850 EVO 250G
size: 232.89 GiB block size: physical: 512 B logical: 512 B serial: <filter>
rev: 0X06 scheme: GPT
ID-2: /dev/sdb type: USB vendor: Corsair model: Voyager size: 15.12 GiB
block size: physical: 512 B logical: 512 B serial: <filter> rev: 0.00
scheme: MBR
RAID:
Hardware-1: Intel 82801 Mobile SATA Controller [RAID mode] driver: ahci
v: 3.0 port: f060 bus ID: 00:17.0 chip ID: 8086.282a rev: 21
Partition:
ID-1: / raw size: 232.59 GiB size: 227.94 GiB (98.00%)
used: 60.15 GiB (26.4%) fs: ext4 dev: /dev/sda2
Swap:
Alert: No Swap data was found.
Sensors:
System Temperatures: cpu: 51.5 C mobo: N/A
Fan Speeds (RPM): cpu: 0
Info:
Processes: 277 Uptime: 4h 05m Memory: 15.51 GiB used: 2.51 GiB (16.2%)
Init: systemd v: 246 Compilers: gcc: 10.2.0 Packages: pacman: 1142 lib: 327
Shell: Zsh v: 5.8 running in: gnome-terminal inxi: 3.1.08Hi @niclasc,
I understood your comment, I have no experience on booting from an USB.
I can recommend two other post from the forum whether you could find help:
'https://forum.manjaro.org/t/wan-speeds-slower-than-windows/24509/7´
and ‘WIFI doesn't work with new install, driver is iwlwifi’
Maybe, there is a persistence problem in your USB.
Please, consider to read the following post: https://forum.manjaro.org/t/problems-with-booting-shutdown-in-a-persistent-manjaro-usb-drive-win-10-situation/38902
Regards
Here are 2 speedtests, Both done using the built in browser
This is booting of manjaro-gnome-20.1.2-minimal-201019-linux58.iso:
And this is my install:
Hi @niclasc,
Your wifi driver is supported ´https://wireless.wiki.kernel.org/en/users/drivers/iwlwifi´ here.
The source code is here.
The only advice I can give to you is to install the driver manually.
Regards,
I found an old SSD with manjaro gnome installed. It had kernel 5.9.1-1. So perhaps a month old install
I did a speedtest and got this:
Then I did an update. 398 packages got updated. After the update I got this:
Hi @niclasc,
I have no answer at all and instead several questions.
Did you reboot the machine?
Which command or package did you use to make the update?
At last, try with the solution on the following post:
‘Very slow WiFi after recent update [Unstable Branch]’
Regards,
I updated using package manager and I have reboot more times than I can count.
A clean install using a least a month old iso then the wifi i fine. After an update its broken
In the file /var/lib/NetworkManager/NetworkManager-intern.conf it says “CHANGES TO THIS FILE WILL BE OVERWRITTEN” so why edit that file??
Also that fix is for Realtek RTL8821CE. And I have a Inte card with intel driver
Tried the fix in the link but it did not help. Speed/connection so bad that I cant run the speedtest
Speedtest by Ookla
Server: Telenor AB - Stockholm (id = 34441)
ISP: Telenor Sverige AB
Latency: 7.18 ms (1.24 ms jitter)
Download: 1.12 Mbps (data used: 1.6 MB)
Upload: FAILED
[error] Cannot write: Resource temporarily unavailableDo you get other results when you turn ecn off sudo sysctl net.ipv4.tcp_ecn=0 or full on sudo sysctl net.ipv4.tcp_ecn=1
None of them helps. I’m at around 1/10 of the speed I should be
sudo sysctl net.ipv4.tcp_ecn=0 gives:
Speedtest by Ookla
Server: Telenor AB - Stockholm (id = 34441)
ISP: Telenor Sverige AB
Latency: 5.19 ms (2.35 ms jitter)
Download: 12.01 Mbps (data used: 21.6 MB)
Upload: 35.86 Mbps (data used: 56.4 MB)
Packet Loss: 0.0%
And sudo sysctl net.ipv4.tcp_ecn=1 gives:
Speedtest by Ookla
Server: Telenor AB - Stockholm (id = 34441)
ISP: Telenor Sverige AB
Latency: 6.04 ms (1.35 ms jitter)
Download: 13.67 Mbps (data used: 20.1 MB)
Upload: 22.18 Mbps (data used: 38.1 MB)
Packet Loss: 0.0%And whats the default setting for this?
ecn off or on?
Ecn 2 is default
With iso manjaro-gnome-20.1.2-minimal-201019-linux58.iso wifi runs at full speed
But with newest iso manjaro-gnome-20.2-minimal-201203-linux59.iso wifi is VERY slow. Just a few Mbits
Something has changed from one old iso to the latesgt so that affects the speed of wifi
If you suspect the wifi driver, you could check which versions are installed on both.
If they differ you could try downgrade the driver to see if that helps…
Start by using the latest iso 
PS:
Just crosslinking Manjaro 20.2 Nibia got released to have this issue linked in that thread.
You might also post something there mentioning this thread so more will notice it…
How do I check version of wifi driver?
You could use:
Path: in the wifi interface.Path: pci-0000:05:00.00000:05:00.0
Kernel driver in use: wl
/lib/modules/5.9.11-3-MANJARO/extramodules/wl.ko.xz
linux59-broadcom-wl 6.30.223.271-10linux59-broadcom-wl with version 6.30.223.271-10
On iso manjaro-gnome-20.1.2-minimal-201019-linux58.iso iwlwifi-ko-xz is owned by linux58 5.8.16-2
On iso manjaro-gnome-20.2-minimal-201203-linux59.iso iwlwifi-ko-xz is owned by linux59 5.9.11-3
2.4Ghz or 5Ghz make any difference?
You could try to downgrade the linux-firmware to the one that has no problem.
Also check your dmesg if you have any microcode sw errors
I only have 5GHz so cant test on 2.4GHz
How do I downgrade linux-firmware?