We have brand new 3x NUC8i5BEH with clean Win10 1803 x64 install and all the latest drivers.
Two of them after wake up from sleep (S3) state suffered LAN lags - so bad it was unusable. The quick help? Change any setting on LAN adapter or reconect cable ... simply reset that network adapter and it was fine again. But after nex sleep/wake it was again slow.
3rd PC was not affected and all was working good.
I tried all settings on 219V Lan adapter, but nothing.
Finally I saw on the workinfg PC, that one setting in BIOS is different:
I changed it on both to Legacy. And after accepting some warning that it should not be switched if OS is installed everything just started worknig OK !
So you have bug in UEFI (version 56) or in Windows drivers.
I tried these drivers: 23.4 and 23.5.2.
Another strange thing (unrelated, I gues) is that even if in UEFI I disabled WAN interface I see "Intel Wireless-AC 9560" in Windows devices and I had to disable it there. How is that so?
Here you have screenshots (today I even updated BIOS to new 64 - did not help) :
David, in my previous response I stated I updated to latest BIOS : "... (today I even updated BIOS to new 64 - did not help) ..."
And my problem is not "there will not be a way to turn the WiFi ON", but:
Oh man ... I don't care if user is able to connect to or use any available/listed Wifi network or if user is able to access LAN/Internet - the thing is, that if WLAN is unchecked in BIOS , it should [ "first of all" ] NOT appear in windows device manager (so no usage of WIFI is possible).
Look, I have NUC7i3BNK here with "WLAN unchecked" in BIOS ... and as you can see, there is no "WLAN adapter" in Device manager ... only "LAN: 2019-V":
And this is absolutely correct and desired behaviour and NUC8iBEx should behave just like this ...
Do you understand now what is my point here?
I have BIOS 66 on both NUCs. I upgraded to Win1809 too - still Wifi 9560 in Device manager (before upgrade to 1809 I have this device disabled, after upgrade it was enabled).
Poth have 2x 4GB Kingston HyperX installed.
The 1st NUC has 128GB NVMe Transcend TS128GMTE110S, 2nd has 240GB NVMe ADATA SX8200NP.
Both have SATA chipset disabled (unchecked), Secure boot enabled, Legacy standby (Modern standby disabled), Legacy boot disabled, USB and LAN boot disabled, Max performance profile enabled, Fast boot disabled.
Here are some BIOS screenshots:
as I wrote "I upgraded to Win1809 too - still Wifi 9560 in Device manager (before upgrade to 1809 I have this device disabled, after upgrade it was enabled)." - yes, I have now Win10 1809 on NUCs.
RAMs are Kingston HX424S14IBK2/8 (and HX424S14IB2K2/16 on 2nd NUC).
Regarding the "Modern standby" option: yes, I disabled this with Win10 installed. It is possible that this switch could be the culprit. But I will not be switching it back on these two NUCs - they are production machines, running stable now and I don't want to cause some instability on them. I have ordered and I am expecting delivery of another two of these NUCs, so I will test on these with "Modern standby=enabled" first, then disabling this and we will see.
Unfortunately new NUCs have not arrived yet - our supplier says there are problems with avalability of Intel CPUs so it might be related to NUCs too :(
We have to wait and then I will let you know.
This topic is closed so I will continue in new one with same name.