Non responsive monitor

Hi all,

I have noticed the following behavior on the HiKey 970, I wanted to ask if someone has observed something similar and how I can fix it.

Having the device connected to a monitor through HDMI, after some time of inactivity (in the range of 10’), the monitor will get dark and unable to find an HDMI signal. The device though is not sleeping, I can connect remotely and still access the device.

I tried connecting a different monitor but the same thing happens, there is no HDMI signal received by the monitor. Only after I restart the device, the monitor picks up signal.

I have disabled sleep and hibernation on the device through systemctl mask.

I observe the same behavior with the device flashed with lebian and android.