Frametime in Beta 3.6.9 is never smooth

[DreamboxMinerva]

Steam OS Beta : 3.6.9 LCD Deck

It seems that the frametime graph from the Deck OSD does not show a smooth line anymore, which was not the case before. It seems that the games actually run the same as before which would mean this is just visual, is this intended ? it makes it harder to work on making a smooth framepacing in a game.

This happen with every single game, when I go back to 3.5.19 Stable the "issue" disappear and the line is smooth again, here's a comparison with Dead Rising 1, which is a very easy gam for the deck to handle at 60 fps.

It does not matter if the in game vsync / fps lock in turned on or off, the frametime stay the same.

Here's a comparison of both https://imgur.com/a/QR77EYH