u/Exciting_Ad2342

Hey,

I have a GIGABYTE Z590 UD AC motherboard with its onboard WiFi (Intel Wireless-AC 9560) and an external RP-SMA antenna.

On Arch Linux I constantly get only 2 bars on 5GHz - weak signal, slow speeds. On Windows 11 (same machine, dual boot) - full signal, everything works perfectly. The antenna is physically connected and hasn't moved.

My setup:

- Motherboard: GIGABYTE Z590 UD AC
- CPU: Intel Core i3-10100F
- WiFi: Intel Wireless-AC 9560 (onboard, PCI dev 43f0/0034)
- Firmware: 77.f39cc7f9.0 QuZ-a0-jf-b0-77.ucode
- Kernel: 7.0.3-arch1-2- WM: Hyprland

iw dev output:

phy#0
Interface wlan0
ssid xxxx
type managed
channel 40 (5200 MHz), width: 80 MHz
txpower 20.00 dBm
iw reg get output:
global
country 00: DFS-UNSET
phy#0 (self-managed)
country 00: DFS-UNSET
...(almost all 5GHz channels marked PASSIVE-SCAN)

dmesg | grep iwlwifi:

iwlwifi 0000:00:14.3: Detected Intel(R) Wireless-AC 9560 160MHz
iwlwifi 0000:00:14.3: loaded firmware version 77.f39cc7f9.0 QuZ-a0-jf-b0-77.ucode