SteamOS 3.5 has just been released to the Preview channel, and includes new features that are still being tested. You can opt into this in Settings > System > System Update Channel. Display The default color rendering for Steam Deck has been adjusted to emulate the sRGB color gamut, resulting in a slightly warmer and more vibrant color appearance. Added Settings -> Adjust Display Colors, to tune the display's Color Vibrancy and Color Temperature.
I had a gigantic write up with a lot of research over it, too bad it was on Reddit and I deleted all my posts. In short, it was NOT caused by the Texas Instrument IC as the popular post floating around suggested, and it was not thermal issues either, but Valve was indeed the first to successfully fix it - it affects other AMD GPUs too, at a smaller scale, and nobody had managed to come up with a definitive fix.
Oh the fix for the 400MHz issue is huge.
I had a gigantic write up with a lot of research over it, too bad it was on Reddit and I deleted all my posts. In short, it was NOT caused by the Texas Instrument IC as the popular post floating around suggested, and it was not thermal issues either, but Valve was indeed the first to successfully fix it - it affects other AMD GPUs too, at a smaller scale, and nobody had managed to come up with a definitive fix.
I just had to RMA mine in for this issue, still waiting for new unit. Hopefully this does really fix it.