"At its base, this workaround compresses the luminance data that defines the color range of the video signal. That means SteamOS can maximize the resolution and frame rate it can squeeze through the more limited bandwidth allowed by Linux's HDMI 2.0 drivers. Chroma subsampling's reduced color information can noticeably affect the overall quality of video output, according to most accounts."
"Still, the display testers at RTINGS suggest that it shouldn't "significantly affect picture quality" and that only "some PC games that have a strong focus on text might suffer" from slightly blurrier on-screen words, in some cases. And players that want to avoid the issue can use the Steam Machine's DisplayPort 1.4 output, which supports even more bandwidth than HDMI 2.1 (and which can be converted to an HDMI signal with a simple dongle)."
"The lack of full HDMI 2.1 support also limits how the Steam Machine will handle adaptive sync refresh rates. Valve says that it currently supports AMD's FreeSync standard over HDMI, but is unable to support the more generalized HDMI-VRR allowed by the 2.1 standard, due to the aforementioned driver issues. That could be a problem for some living rooms, as many TVs that support HDMI-VRR can't specifically handle AMD's FreeSync ( consult a list like this to see which are which)."
Chroma subsampling compresses luminance data that defines the video signal's color range, enabling SteamOS to push higher resolutions and frame rates through Linux's limited HDMI 2.0 bandwidth. The reduced color information from chroma subsampling can noticeably affect video output quality, though some testing indicates it should not significantly affect picture quality aside from slightly blurrier on-screen text in certain PC games. Players can avoid the issue by using the Steam Machine's DisplayPort 1.4 output, which supports greater bandwidth and can be converted to HDMI. Full HDMI 2.1 features like HDMI-VRR remain unsupported due to driver limitations, while AMD FreeSync over HDMI is available.
Read at Ars Technica
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