Fix slow Wi-Fi on Linux when Windows is fast on the same laptop. Works around routers advertising a broken Basic HT-MCS Set, which makes mac80211 log 'required MCSes not supported, disabling HT' and drop to 54 Mbit/s. DKMS module + diagnostic script.
linux router networking kernel kernel-module linux-kernel wifi wireless dkms comcast networkmanager troubleshooting realtek xfinity 802-11 mac80211 wifi6 rtw89 rtl8852be slow-wifi
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Updated
Sep 5, 2026 - Shell