I"m using my Dell XPS 15 9520 laptop (Win11) with my home WiFi network which provides both 5 and 2.4 GHz coverage with 100Mbps provider uplink. The room corner where I'm sitting has not so good WiFi coverage - only 2.4Ghz wifi is available here, however both my laptop and my phone show about 10...30Mbps (measured with Speedtest web).
I'd like to connect my Dell laptop to my Dell P2720 monitor through USB-C cable. The problem is once I connect my laptop to the monitor, WiFi receiving speed on the laptop is decreased to 1 Mbps or even less. The speed is restored if I disconnect the monitor from the laptop.
I also used "netsh wlan show interfaces" command to see WiFi properties.
With the monitor disconnected it shows:
Receive rate (Mbps) : 15
Transmit rate (Mbps) : 39
When connected:
Receive rate (Mbps) : 2
Transmit rate (Mbps) : 39
Dell Utility says all the drivers are up to date. The problem occurs regardless I connect the laptop to the power adapter or not. The problem occurs regardless I connect the laptop to the monitor with USB-C_USB-C cable, or USB-C_HDMI. The problem seems don't occur in the good coverage area neither with 5GHz nor 2.4GHz.
I'd appreciate any help.