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If Linux Wi-Fi seems slower than the router’s headline rating, check the wireless regulatory domain first. Run iw reg get and confirm the country shown matches where you are using the device. A mismatched country can restrict available channels or channel widths, but correcting it is not a guaranteed speed fix: hardware, drivers, signal, router settings, and internet service also affect performance.
What the regulatory domain can—and cannot—explain
Linux uses a regulatory domain to determine which wireless channels and operating conditions are permitted for a country. The domain and device-specific driver rules can limit which channels or channel widths are usable, potentially preventing a client from using a wider mode supported by the router. See the Linux Wireless regulatory documentation and the kernel cfg80211 documentation.
This makes the country setting a sensible first check when a connection appears constrained, not proof that it is the cause. A router’s advertised rating is not a promise of the speed one client will achieve, and changing the domain cannot add capabilities missing from the adapter or its driver.
Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsCheck the country Linux is using
- Open a terminal and run
iw reg get. - Inspect the reported regulatory country code. It should correspond to your actual location, not a country chosen to expose additional channels.
- If the code is wrong, set the actual two-letter ISO country code with
sudo iw reg set XX, replacingXXwith your country’s code. The iw documentation describesiw reg set alpha2for this purpose.
Changing the runtime setting is a diagnostic correction; persistence after reboot depends on the distribution and wireless-management configuration. The available documentation does not establish one persistence procedure that applies to every Linux system. If it reverts, consult your distribution’s documentation for how it configures wireless regulatory settings.
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Check whether the connection is using the expected capability
Use these read-only checks to inspect the active link, power-save state, and wireless hardware information. Substitute your interface and PHY names where indicated; command support may vary, so check the installed iw manual if a command is unavailable.
iw dev <interface> link— shows details of the current wireless link.iw dev <interface> get power_save— reports the interface’s power-save setting.iw phy <phy> info— lists wireless PHY capabilities and supported channels.
Compare the adapter’s capabilities and the connection’s band and link details with what the router offers. Driver or regulatory restrictions can prevent wider channels. For example, Linux Wireless’ ath10k configuration documentation says of an AP setup error: “If you get ‘set channel failed to set in kernel’ error message, most likely your regulatory database doesn’t support 80 MHz channels.” That example concerns ath10k access-point configuration; it is not a universal diagnosis for a slow client connection.
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Check band and power saving without forcing client channel width
NetworkManager exposes a band selector and a power-save option in connection configuration. Those controls can help identify a profile or power setting worth checking, but they do not make every adapter use a particular channel width. In particular, NetworkManager’s channel-width property is for Access Point mode; it is not a client-side switch to force a laptop’s connection width. See the NetworkManager settings reference.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →Power saving can be queried with iw dev <interface> get power_save. The existence of this setting does not establish that turning it off will universally improve throughput, so treat it as one diagnostic variable rather than a guaranteed remedy.
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Separate Wi-Fi link limits from internet speed
Compare the reported Wi-Fi link information with an internet speed test, ideally under consistent conditions. If possible, compare with another device on the same router or test near the router. A weak signal, a different band, router configuration, adapter limits, and the internet connection itself can all affect the result. These comparisons help narrow the cause; they do not by themselves prove the regulatory domain is responsible.
If the correct country is configured and the link still falls short, focus next on the adapter and its Linux driver support, the band and channel the router is using, signal conditions, and whether the limitation appears in local Wi-Fi link details or only in internet tests.
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