Realtek Gaming GbE Family Controller not responding at full speed.
Realtek Gaming GbE Family Controller not responding at full speed.
Your PC works fine on a gigabit switch but struggles at 100/100 Mbps. Using the same cable next to it gives full speeds. You've tried several fixes: driver updates, BIOS changes, speed settings in control panel, full duplex, resetting network options, booting into Ubuntu, and even switching to Windows 11. Since speeds return to normal quickly after reboots, it’s likely not a hardware issue. Consider checking if the switch or cable is functioning correctly, and verify your network configuration settings.