If you’ve been having some problems with slow Wi-fi on your Surface Book or Surface Pro 4, I have good news.
Microsoft knows about the slow Wi-Fi issue and is working on a patch for the problem. From the information available, it appears that it’s software-related problem related to MAC layer aggregation (AMSDU over AMPDU) and certain types of wireless access points. In other words, they’re saying it’s the access point, not the Surface or Windows 10, per se.
Like you care, you just want it to work, right? 😉
While the problem *should* only affect a small percentage of access points, a fair of people are complaining about it, so Microsoft has promised to resolve it with a update on their Microsoft Community Forum.
Slow Surface Pro 4 or Surface Book Wi-Fi: The Fix
Unfortunately we don’t know when the fix will be released but it should be pretty soon. In the meantime, you can try the following registry change to work around the problem.
- Search for regedit and open it from the results.
- Go to HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\mrvlpcie8897
- Find the entry for TXAMSDU, modify the value from 1 to 0 (Hex)
- Save the change and restart your Surface
If your Surface Wi-Fi speed problem is stemming form the MAC aggregation issue, this should help but the real “fix” will be coming along as a Windows update in the near future. So, keep checking for new updates.