搭载RTL8188EE的东芝Satellite C55-A5286 Ubuntu17.10无线速度异常求助

Hey Sean, I feel your pain—waiting ages to load lecture slides or research papers when your peers are cruising at 40Mbps is totally frustrating. Let’s walk through actionable steps to get your wireless speed back on track:

1. First, Identify Your Wireless Card Model #

Before diving into fixes, we need to know exactly what hardware you’re working with. Open a terminal and run one of these commands (whichever gives you clear output):

• For PCIe wireless cards (most laptops):

  lspci | grep Network
  

• For USB wireless adapters (if you’re using one):

  lsusb
  

This will give us the make and model (e.g., Broadcom BCM43142, Realtek RTL8723BE), which is critical for targeting the right driver fixes.

2. Rule Out Basic Issues First #

Let’s eliminate the easy culprits:

• Check for wireless soft/hard blocks: Run rfkill list—if you see Soft blocked: yes, unblock it with sudo rfkill unblock wifi. Ensure Hard blocked: no (if it’s yes, look for a physical switch on your laptop).
• Disable Wi-Fi Power Saving: This is a common culprit for slow speeds. Edit the power save configuration file:

  sudo nano /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf
  

  Change the line wifi.powersave = 3 to wifi.powersave = 2 (2 = disable power saving). Save with Ctrl+O, exit with Ctrl+X, then restart NetworkManager:

  sudo systemctl restart NetworkManager
  

3. Target Driver-Specific Fixes #

Since you mentioned a Toshiba Satellite thread, it’s likely you have a common chipset like Broadcom or Realtek:

For Broadcom Chipsets (e.g., BCM43142) #

Ubuntu 17.10 might be using the open-source brcmsmac driver, which can be slow for some models. Install the proprietary driver instead:

sudo apt update
sudo apt install bcmwl-kernel-source

Reboot your laptop and test the speed again.

For Realtek Chipsets (e.g., RTL8723BE) #

Some Realtek cards suffer from signal strength issues. Try adjusting the antenna selection:

1. First, check available antennas:

   cat /sys/module/rtl8723be/parameters/ant_sel
   

2. If the output is 0 or 1, try switching to the other option (e.g., if it’s 1, set to 0):

   sudo modprobe -r rtl8723be
   sudo modprobe rtl8723be ant_sel=2
   

3. To make this change permanent, create a config file:

   sudo nano /etc/modprobe.d/rtl8723be.conf
   

   Add the line options rtl8723be ant_sel=2, save and exit, then reboot.

4. Additional Tweaks for Better Speed #

• Disable IPv6: Some networks don’t handle IPv6 well, causing slowdowns. Go to your Wi-Fi settings → IPv6 → set Method to Ignore, then reconnect.
• Switch to 5GHz Band: If your router supports it, connect to the 5GHz network (usually named with -5G at the end) — it has less interference than 2.4GHz.
• Test Speed: Install speedtest-cli to measure your improvement:

  sudo apt install speedtest-cli
  speedtest-cli
  

If none of these work, share the output from the first step (your wireless card model) and I can help narrow it down further!

内容的提问来源于stack exchange，提问作者Sean