Comment 4 for bug 1827790

I have some doubt that this is a duplicate of bug 1826125, though I see how they are similar. I'm experiencing the same issue described in this bug, and the visual effect is quite different than the photos and videos attached to the other bug. In the other one, the issue appears to involve different parts of the display flickering around, or different parts of the screen getting "out of sync" so it looks like there are horizontal bands. The problem in the other bug is also described as quite frequent/constant.

I'm not experiencing any of that, but I am experiencing what Daniel C describes in this bug: my entire screen flashes quite brightly for a split second, then calms back down. The effect is uniform across the screen, there's no banding or shifting that I can see. It only happens once every few minutes, not constantly as described in the other bug. The flashing is most noticeable when the "Night Light" effect is active in the evening, though I believe I've also seen it happen during the day.

One other important distinction: like Daniel C, I have an XPS 9380 with the non-touch 1080p display, and I wiped Dell's pre-installed 18.04 and installed 19.04 instead. The other bug has several references in the comments to it affecting the XPS 9380 with the "4k" display. So I believe the flashing described in this bug is a different problem with a different panel.