Running main monitor off USBC, second monitor off HDMI. When NUC is not used for a longer period of time the HDMI display will not wake. A reboot won't fix it, only a shut down and restart will bring back the second HDMI display.
I've swapped monitors and cables. I've loaded the latest Intel 655 graphics drivers and the latest bios.
This is the second NUC, the first was exchanged because when I was running just 1 monitor it would not wake up after an extended period of no use. The new unit did not have this problem, but now I have the same issue with the second display. The main USB-C connected display does wake.
I've changed many of settings for sleep and power without a fix.
I have tried both 188.8.131.5244 and 184.108.40.20671 drivers. My main display is BenQ PD3200 and second display is LG 32UD59. The test monitor was a Samsung U28D590D.
The HDMI cables were what came with the displays, plus an Impact Acoustics Sonicwave and Vanco Redmere.
Since my original post I changed some of the power settings again and uninstalled the software that came with the BenQ and the second monitor has been waking.
I reset the bios to defaults. I turned off all sleep modes for monitors, hard drive and system. I shut down and restarted. The 2 1/2 minute no input going to sleep problem has stopped. So far the monitors are working. Today after running the intel driver update software there is a bios update that includes updated video drivers. At his point the system is workable (though no power settings working) so I am going to keep it as it is. I just want it to work.
thanks for your assistance,
I've run into the problem also on the NUC8i7BEH. I'm running BIOS 0064 and the latest DCH video drivers 220.127.116.1177 on Windows 10 1809 (17763) with all the latest cumulative updates (10.0.17763.348). I have a Dell P2715Q. If the monitor is connected via the native HDMI port it wakes but eventually stops. Sometimes it takes a few hours and sometimes a few days. Just when you think you've fixed it you sit down, shake the mouse or tap on the keyboard and nothing happens. The computer is up and I can access it from another pc over the LAN. The only way to get the monitor to wake up is to power down the NUC and power back on. Then it will work for a short while and then the process repeats. I've found two workarounds. One is to disable the screen turning off, enabling the screen saver and turning off the monitor manually. What a pain. The other which I just started testing over the weekend is to use a USBC to HDMI adapter like this one. So far the monitor has came on every time I sat down at the pc using the USBC adapter and it's been a few days. Apparently there is an issue with either the BIOS, video driver or the HDMI firmware when waking the monitor as I've seen it on multiple NUC8i7BEH's at our company. It's a very annoying problem resulting in calls from the end user.
Answers to the questions below:
I only have one monitor attached to my system. When the monitor is attached directly to the built in HDMI port is when I have the monitor not waking issue. Currently I am using my workaround by connecting the monitor to the Startech USBC to HDMI adapter and using the thunderbolt port. When I connect the monitor this way it seems to wake up every time as mentioned above, however I I would like to use the built in HDMI and keep my thunderbolt port open for connecting future devices.. The monitor model is a Dell P2715Q.
The video cable is the same that I used with my previous pc and Windows 10 and never had any issues. The cable is a 3 foot Cables To Go highspeed HDMI cable as seen here.
The memory is two 8GB Kingston DDR4-2400 (KVR24S17S8/8) as seen here.
Only thing connected is a USB dongle for the Microsoft wireless keyboard and mouse and of course the Startech USBC to HDMI adapter.
I've attached the output of the SSU.
I've had this NUC for a while now and each time a driver update has come out or a BIOS update I've tried it hoping it would fix the issue. When I first built it I used used the legacy 18.104.22.16829, 22.214.171.12444, and now I am on the latest DCH driver 126.96.36.19977. They all seem to have the same issue. According to the docs it's not recommended to go back from a DCH to a legacy driver as it can cause system instability so I have to stick with the 188.8.131.5277 DCH. So far since March 2nd, using the Startech USBC to HDMI adapter has worked flawlessly. Hopefully a driver or BIOS update will be able to fix the built in HDMI waking issue.