前々からLinux ディストリビューションにおいて、
Windows のデバイスマネージャーのようなGUI一覧画面はないのだろうか?、と思っていた。
コマンドは苦手。
システム情報画面は大雑把すぎる(Linux Mint の例)
ジャンクマシン、初代ザク的いにしえの趣きになったものよ。
スクリーンショット 2021-06-19 08-35-53

Linux Mint でデバイスマネージャーのようなGUI一覧画面を発見。「システムレポート」アプリ内に少し詳しいデバイス情報が出てくる。
2021-06-19_08-24

縦覧していくと、WiFiチップのメーカーが、intel 製との文字列に目が留った。確か、intel 製WiFiチップはLinux において性能を意図的に抑制されている、との記事を見たことがある。
2021-06-19_08-29



Speed up your Intel wireless chipset

11. If you have a (reasonably) modern wireless chipset from Intel, it'll run on the iwlwifi driver. If so, you might be able to increase its speed noticeably, by turning on Tx AMPDU for it.

The purpose of AMPDU is to improve data transmission by aggregating or grouping together several sets of data. Thus it sharply reduces the amount of transmission overhead.

It used to be "on" by default in the iwlwifi driver. But several years ago, it was turned off because of stability issues on a few wifi chipsets. This problem affects, however, only a minority of chipsets...

For turning it on, proceed like this:

a. First check whether your chipset runs on the iwlwifi driver:

Launch a terminal window.
(You can launch a terminal window like this: *Click*)

Use copy/paste to transfer this line into the terminal:

lsmod | grep iwlwifi

Press Enter.

Does the terminal output contain the word iwlwifi (in red letters)? If so, proceed with the next step.

b. Use copy/paste to transfer the following blue line (it's one line!) to the terminal. Don't type it; it's too easy to make typing errors:

echo "options iwlwifi 11n_disable=8" | sudo tee /etc/modprobe.d/iwlwifi-speed.conf

Press Enter. Type your password when prompted. In Ubuntu this remains entirely invisible, not even dots will show when you type it, that's normal. In Mint this has changed: you'll see asterisks when you type. Press Enter again.

Don't be confused by the name of the option: when it's set to 8, you don't actually disable anything but you enable something.

c. Reboot your computer.

d. Finally, check your new wireless speed, for example on speedtest.net.

Has your wifi become unstable? Then undo the iwlwifi hack as described below.

Problems? Then undo it like this

11.1. Does the iwlwifi hack create stability issues for your wifi? Then undo it with the following terminal command:

sudo rm -v /etc/modprobe.d/iwlwifi-speed.conf

Then reboot. All should be then, as it was before.
その前に、そもそもBiosやUEFI側に上流設定がないかも要確認だ。
適用したらWiFi速度というか、各操作の反応が良くなった気がするのはなぜに?

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