No idea whether it's the same thing but last night I was tinkering away at my PinePhone for hours, with it plugged into my wall charger via the Convergence adapter. It started powering off a couple of times and eventually ended up booting off my eMMC into Manjaro, ignoring the OS on my SD card.
I continued working in Manjaro for a short while and then the screen went black(ish) and as I waited, it slowly unfaded through gray towards a white colour.
It had turned out that the Manjaro power app told me the battery was at 0%, so the heavy stuff I was doing combined with the USB keyboard and touchpad I had connected obviously drained the battery (even while on charge).
So what I was trying to say was it's possible that fading gray blank screen is a (low) power issue.
I continued working in Manjaro for a short while and then the screen went black(ish) and as I waited, it slowly unfaded through gray towards a white colour.
It had turned out that the Manjaro power app told me the battery was at 0%, so the heavy stuff I was doing combined with the USB keyboard and touchpad I had connected obviously drained the battery (even while on charge).
So what I was trying to say was it's possible that fading gray blank screen is a (low) power issue.