安装RTL8852BE PCIe无线网卡后Kubuntu关机自动重启问题及驱动安全重装咨询

Hey there, let's work through this shutdown/reboot issue with your RTL8852BE step by step—we'll keep the driver reinstall safe so you don't end up with new problems. Here's what to do:

1. 先搭好安全备份（重中之重） #

Before touching any drivers, let's create a system snapshot so you can roll back if anything goes sideways. Kubuntu makes this easy with Timeshift:

• Install it if you don't have it already:

  sudo apt update && sudo apt install timeshift
  

• Run Timeshift from your app menu, follow the prompts to create a snapshot (pick a storage location with enough space). Store this somewhere safe—this is your undo button.

2. 确认当前驱动状态 #

First, let's check exactly which driver your system is using for the RTL8852BE:
Run this command in the terminal:

lspci -k | grep -A 3 Network

Look for lines like Kernel driver in use: rtw89_8852be or a third-party driver name. This tells us whether you're using the built-in kernel driver or a custom one you might've installed earlier.

3. 干净卸载现有驱动 #

How you uninstall depends on what driver you're running:

If you're using a third-party DKMS/PPA driver: #

• PPA-installed: First remove the PPA (find its name in /etc/apt/sources.list.d/ if you don't remember it), then purge the driver package:

  sudo add-apt-repository --remove ppa:your-driver-ppa/here
  sudo apt purge rtl8852be-dkms  # Replace with your actual package name if different
  

• Source-compiled: Navigate to the folder where you compiled the driver, then run:

  sudo make uninstall
  sudo rm -rf /usr/src/rtw89-*  # Clean up leftover source files
  

If you're using the kernel's built-in driver: #

You don't need to "uninstall" it, but we can reset it by reloading the module first:

sudo modprobe -r rtw89_8852be
sudo modprobe rtw89_8852be

If that doesn't fix the reboot issue, we'll move to reinstalling/updating the kernel's driver.

4. 安全重装驱动 #

We'll start with the most stable option—using the kernel's official driver—then move to community drivers if needed.

Option 1: Update your kernel (for built-in driver fixes) #

Kubuntu 24.04.1 might have an older kernel version with bugs for RTL8852BE. Upgrading to the latest stable HWE kernel often fixes power management issues:

sudo apt update && sudo apt upgrade
sudo apt install linux-generic-hwe-22.04

Reboot your system after this—your kernel will update, and the built-in RTL8852BE driver will get the latest fixes.

Option 2: Install community-maintained DKMS driver #

If the kernel driver still causes reboot issues, try this well-maintained community driver (it's specifically for RTL8852BE):

1. Install required dependencies first:

   sudo apt install git dkms build-essential linux-headers-$(uname -r)
   

2. Clone the driver source from a trusted community repo (you can find mainstream options on popular open-source code platforms, like the one maintained by lwfinger):

   git clone <社区驱动仓库地址>
   

3. Install it via DKMS (so it stays working after kernel updates):

   cd rtw89  # Replace with the repo folder name if different
   sudo make dkms_install
   

4. Reboot your system to load the new driver.

5. 测试并验证 #

After rebooting:

• Run lspci -k | grep -A 3 Network again to confirm the correct driver is loaded.
• Test sleep first: Run systemctl suspend, wake the system up, and check if it works normally.
• Then test shutdown: Run systemctl poweroff and make sure it doesn't reboot unexpectedly.

6. If the issue persists: Tweak power management settings #

Sometimes the problem is with power management, not the driver itself. Try these:

• Disable WiFi power saving:
  1. Check your WiFi interface name with ip link show (it'll look like wlan0 or wlp2s0).
  2. Turn off power saving temporarily:

     sudo iwconfig wlan0 power off  # Replace wlan0 with your interface
     

  3. Make it permanent: Edit /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf and change wifi.powersave = 3 to wifi.powersave = 2, then restart NetworkManager:

     sudo systemctl restart NetworkManager
     

• Adjust ACPI settings: Edit /etc/default/grub, find the line starting with GRUB_CMDLINE_LINUX_DEFAULT, add acpi=force to the end (inside the quotes), like:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi=force"
  

  Then update grub and reboot:

  sudo update-grub
  sudo reboot
  

备注：内容来源于stack exchange，提问作者Lafayette