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Basically, until I unplug and plug back my cable, I'm stuck at a 100 mbit connection. Replugging it fixes the issue, but I'd hate to do this every time I start up my computer.

Could someone please share some insights as to what I can do to fix this?

I've just downloaded the latest drivers for Realtek PCIe Family Controller on Windows 10.

I've also tried removing Auto-Negotiation and various other settings like Power savings mode and what-not to no avail.

I searched over the internet for workarounds, but most people are stuck trying to identify if they even support a gigabit connection, whereas I clearly do - it's just a funky glitch requiring manual labor to "fix".

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    Does this happen after booting up the PC or do you use standby or hibernate mode? Windows 10 has a built-in partial hibernate functionality called "fast startup". You can try to disable it and see if it solved your problem.
    – Robert
    Commented Oct 25, 2021 at 18:05
  • @Robert after booting up the PC. The funny thing is that after I've done it once - changing any settings on my device (like for example changing from auto negotiation to 1000 full duplex) will still connect with the proper speed (1Gbps)
    – SpiritBob
    Commented Oct 25, 2021 at 18:07
  • What I would do is get a good (high) quality USB 3 Ethernet Adapter and see if the speed is reliable between restarts.
    – anon
    Commented Oct 25, 2021 at 18:11
  • @Robert disabling my Fast Boot option from the BIOS made it possible to restart my computer without having to unplug my cable. I'll let you know tomorrow if the problem has fully been fixed. Thank you!
    – SpiritBob
    Commented Oct 25, 2021 at 18:20
  • Fastboot Isa Windows 10 option, a similar named option in your BIOS should be something different.
    – Robert
    Commented Oct 25, 2021 at 20:31

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