如何将WiFi从2.4GHz改为5GHz并禁用网卡节能

<#
.SYNOPSIS
    一键将 WiFi 优先频带设为 5GHz 并禁用无线网卡节能
    需要以管理员身份运行
#>

# 检查管理员权限
if (-NOT ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) {
    Write-Host "请右键此脚本，选择「以管理员身份运行」" -ForegroundColor Red
    pause
    exit 1
}

Write-Host "===== WiFi 5GHz 优化工具 =====" -ForegroundColor Cyan
Write-Host ""

# 1. 查找无线网卡
$adapter = Get-NetAdapter | Where-Object { $_.InterfaceDescription -match "Wireless|WiFi|WLAN|802.11" -and $_.Status -eq "Up" } | Select-Object -First 1

if (-not $adapter) {
    Write-Host "未找到已连接的无线网卡" -ForegroundColor Red
    pause
    exit 1
}

Write-Host "检测到无线网卡: $($adapter.Name)" -ForegroundColor Green
Write-Host ""

# 2. 设置首选频带为 5GHz
Write-Host "[1/3] 设置首选频带为 5GHz..." -ForegroundColor Yellow

$propertyFound = $false
$bandProps = @(
    @{ Name = "Preferred Band"; Value = "5" },
    @{ Name = "Band"; Value = "5" },
    @{ Name = "Wireless Mode"; Value = "802.11a/n/ac/ax" }
)

foreach ($prop in $bandProps) {
    try {
        $regKey = "HKLM:\SYSTEM\CurrentControlSet\Control\Class\{4d36e972-e325-11ce-bfc1-08002be10318}"
        Get-ChildItem $regKey | ForEach-Object {
            if ($_.GetValue("DriverDesc") -eq $adapter.InterfaceDescription) {
                $ndiKey = "$($_.PSPath)\Ndi\Params"
                if (Test-Path "$ndiKey\$($prop.Name)") {
                    Set-ItemProperty -Path $_.PSPath -Name $prop.Name -Value $prop.Value
                    Write-Host "  已设置 $($prop.Name) = $($prop.Value)" -ForegroundColor Green
                    $propertyFound = $true
                }
            }
        }
    } catch {}
    if ($propertyFound) { break }
}

if (-not $propertyFound) {
    Write-Host "无法自动设置首选频带，请在设备管理器中手动操作" -ForegroundColor Yellow
}

# 3. 禁用网卡电源节能
Write-Host "[2/3] 禁用网卡电源节能..." -ForegroundColor Yellow

try {
    Disable-NetAdapterPowerManagement -Name $adapter.Name -ErrorAction SilentlyContinue
    Write-Host "  已禁用网卡电源管理" -ForegroundColor Green
} catch {
    try {
        $regKey = "HKLM:\SYSTEM\CurrentControlSet\Control\Class\{4d36e972-e325-11ce-bfc1-08002be10318}"
        Get-ChildItem $regKey | ForEach-Object {
            if ($_.GetValue("DriverDesc") -eq $adapter.InterfaceDescription) {
                Set-ItemProperty -Path $_.PSPath -Name "PnPCapabilities" -Value 24 -Type DWord
                Write-Host "  已禁用网卡电源管理" -ForegroundColor Green
            }
        }
    } catch {
        Write-Host "禁用失败，请手动取消勾选「允许计算机关闭此设备以节约电源」" -ForegroundColor Yellow
    }
}

# 4. 关闭快速启动
Write-Host "[3/3] 关闭快速启动..." -ForegroundColor Yellow

try {
    $val = (Get-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\Power").HiberbootEnabled
    if ($val -eq 1) {
        Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\Power" -Name "HiberbootEnabled" -Value 0
        Write-Host "  已关闭快速启动" -ForegroundColor Green
    } else {
        Write-Host "  快速启动已是关闭状态" -ForegroundColor Green
    }
} catch {
    Write-Host "修改失败" -ForegroundColor Yellow
}

# 5. 验证
Write-Host ""
Write-Host "===== 设置完成 =====" -ForegroundColor Cyan
Write-Host ""

$info = netsh wlan show interfaces
$info | Select-String "SSID|频带|Band|速度" | ForEach-Object { Write-Host $_.ToString().Trim() -ForegroundColor Green }

Write-Host ""
Write-Host "断开 WiFi 重连一次，让新设置生效" -ForegroundColor White
pause

@echo off
chcp 65001 >nul
title WiFi 5GHz 优化工具

echo ===== WiFi 5GHz 优化工具 =====
echo 请以管理员身份运行
echo.

:: [1/3] 设置首选频带
echo [1/3] 设置无线网卡首选频带为 5GHz...

set KEY_PATH=HKLM\SYSTEM\CurrentControlSet\Control\Class\{4d36e972-e325-11ce-bfc1-08002be10318}
setlocal enabledelayedexpansion

for /f "skip=2 tokens=*" %%A in ('reg query "%KEY_PATH%" 2^>nul ^| findstr "HKLM"') do (
    reg query "%%A" /v "DriverDesc" 2>nul | findstr /i "Wireless WiFi WLAN 802.11" >nul
    if !errorlevel! equ 0 (
        reg query "%%A" /v "Preferred Band" >nul 2>&1
        if !errorlevel! equ 0 (
            reg add "%%A" /v "Preferred Band" /t REG_SZ /d "5" /f >nul
            echo   已设置 Preferred Band = 5
        ) else (
            reg query "%%A" /v "Band" >nul 2>&1
            if !errorlevel! equ 0 (
                reg add "%%A" /v "Band" /t REG_SZ /d "5" /f >nul
                echo   已设置 Band = 5
            ) else (
                reg query "%%A" /v "Wireless Mode" >nul 2>&1
                if !errorlevel! equ 0 (
                    reg add "%%A" /v "Wireless Mode" /t REG_SZ /d "802.11a/n/ac/ax" /f >nul
                    echo   已设置 Wireless Mode = 802.11a/n/ac/ax
                ) else (
                    echo   未找到频带设置选项，请在设备管理器中手动设置
                )
            )
        )

        :: [2/3] 禁用节能
        echo.
        echo [2/3] 禁用网卡电源节能...
        reg add "%%A" /v "PnPCapabilities" /t REG_DWORD /d 24 /f >nul
        if !errorlevel! equ 0 ( echo   已禁用网卡电源节能 ) else ( echo   禁用失败 )
    )
)

echo.
echo [3/3] 关闭快速启动...
reg add "HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Power" /v "HiberbootEnabled" /t REG_DWORD /d 0 /f >nul 2>&1
if !errorlevel! equ 0 ( echo   已关闭快速启动 ) else ( echo   关闭失败，请手动设置 )

echo.
echo ===== 设置完成！=====
echo.
netsh wlan show interfaces | findstr /i "频带 Band SSID 速度"
echo.
echo 断开 WiFi 重连一次使设置生效。
pause