Marvell Semiconductor, Inc. – Net – 15.68.17013.110 WiFi driver breaks 5GHz connection on the Surface Book (1st Gen i5 with dGPU 256 GB)

1. what wifi channel is your 5GHz SSID set to? is it on auto select?

2. where are you geographically?

3. when you say you uninstalled the driver, do you mean rolled back to previous version?

1. what do you mean by "wifi channel"? do you mean what's my wifi channel bandwidth (the 20 MHz; 40 MHz; 80 MHz one), or the Wireless Channel (which i am at number 149)?

2. Regardless of where am I, close to the router or at upstairs, it will say: "Unable to connect to this network"i try to connect to the 5GHz. When i decided to rollback the driver i was able to establish 5 GHz connection again, which means the Marvell Semiconductor, Inc. – Net – 15.68.17013.110 WiFi driver is curpit when i decided to rollback the driver

3. Yes, i had to roll back to the previous version of the wifi driver

I have the same problem with the same driver version as well, applied on 8-1-2019. Your post gave me an idea that maybe it was just the 5GHz channel, but alas, I have the same issue with the 2.4GHz spectrum as well; I went to force the band of the Marvell AVASTAR WiFi adapter to 2.4GHz only and it still would not connect.

I have the Surface Pro (Gen4.5? it's the one where they didn't announce the version) but my experience is the exact same as yours; the moment that driver was applied, I can no longer attach to my home WiFi system (UniFi). Interestingly, the Surface Pro WILL attach to the WiFi hotspot on my iPhone.

Very interesting issue for sure. I normally have this system docked and using Ethernet, but I'm about to travel with it of course.

I wanted to add that I rolled back the WiFi adapter driver to 15.68.9127.58 and all is well. I can now connect on both the 2.4GHz and 5GHz bands. I found a high number of WPA association failures in my UniFi controller logs that are likely the culprit, but I do not have the wherewithal at the moment to troubleshoot further. The old driver meets my needs. I'll let the devs sort this one out.

I wanted to add that I rolled back the WiFi adapter driver to 15.68.9127.58 and all is well. I can now connect on both the 2.4GHz and 5GHz bands. I found a high number of WPA association failures in my UniFi controller logs that are likely the culprit, but I do not have the wherewithal at the moment to troubleshoot further. The old driver meets my needs. I'll let the devs sort this one out.

"I found a high number of WPA association failures in my UniFi controller logs that are likely the culprit, but I do not have the wherewithal at the moment to troubleshoot further."

Then I believe that you need to post some kind of picture or debug log here for them to see if possible

or the Wireless Channel (which i am at number 149)

if you change the channel, any change or not?
what brand and model router?

can you share the version of firmware in the Unify?

Which exact Unify system do you have?

the wifi channel is setted as automatic for me, which means that by default it is set at channel 149

and the brand and model router is the Hitron CGNM-2250 Advanced WiFi Modem

I have the same problem with my Surface Pro 6.  Upgraded to driver 15.68.17013.110 and I couldn't get connected to my wifi either.  I tried forcing 2.4 and 5 Ghz neither worked.  I am using UniFi AC pro access points.  Rolling back to an older version got me back online.