Why does HDR look worse than SDR on my Steam Machine?

Nine times out of ten it's the calibration slider (Step 3) set wrong, or the TV's port "Enhanced/Deep Color" mode is off so you're getting a limited signal. Run the SteamOS HDR calibration and confirm the TV shows an HDR badge when the signal connects. If it still looks dull, your TV may simply have weak HDR (low peak brightness) — many budget LED sets do, and SDR genuinely looks better on them.

Do I need a special HDMI cable for HDR?

You need a certified Ultra High Speed HDMI cable (48 Gbps) to get the full HDMI 2.1 bandwidth for 4K120 plus HDR. A cheap or old "High Speed" cable can pass HDR at lower resolutions but may fail or drop signal at high refresh rates. If you get intermittent black screens or no HDR option at 120Hz , swap the cable first — it's the cheapest thing to rule out.

Can the Steam Machine do Dolby Vision in games?

No. SteamOS gaming targets HDR10, not Dolby Vision, so set your TV input to its standard HDR10 / Game HDR mode rather than a Dolby Vision mode. Forcing a Dolby Vision picture mode on an HDR10 signal just makes the TV's tone-mapping guess wrong, which is another path to washed-out or over-bright output.

Should I turn on HDR for the KDE desktop?

Usually no. The desktop and most SDR apps were designed for SDR, and forcing HDR on them can make whites look grey or text look off on some panels. Keep "HDR on desktop" off, run the desktop in SDR, and let HDR kick in for games. Only enable it if you've checked your desktop actually looks correct with it on.

Steam Machine HDR Setup Guide (Get It Looking Right on Your TV)

HDR on the Steam Machine is genuinely good when it's set up right, and genuinely awful when it isn't. The short version: plug into your TV's HDMI 2.1 port, turn on that port's "enhanced" mode in the TV menu, enable HDR in SteamOS display settings, then run the in-OS calibration. Most of the "HDR looks washed out" complaints come from one of those four steps being skipped, not from the hardware. Here's how to get it right.

Step 1: Use the correct HDMI 2.1 port

The Steam Machine outputs over HDMI 2.1. Your TV almost certainly does not have HDMI 2.1 on every port — most 2021-2024 sets only have it on two of their four ports, and those are usually labeled (HDMI 1 and 2, or the port marked "4K120" / "Game"). Using a non-2.1 port can still give you HDR, but you'll lose the bandwidth headroom for 4K120 or 1440p high-refresh, and some TVs quietly drop to 8-bit or chroma-subsampled output that hurts color.

Check your TV's manual or on-screen labels and plug into the port that supports full bandwidth. Then dig into that port's settings: most TVs have a per-port toggle called "HDMI Deep Color," "Enhanced," "HDMI UHD Color," or "Input Signal Plus." It is off by default on many sets. This single toggle is the most common cause of broken HDR — without it, the TV caps the input and the Steam Machine either won't offer HDR or sends a limited signal.

Step 2: Enable HDR in SteamOS

Once the TV port is set up correctly, go to Settings → Display in SteamOS. If the TV is reporting HDR support over the now-correctly-configured port, you'll see an HDR toggle. Turn it on.

You'll typically get two related options:

Enable HDR — turns on system-level HDR output.
HDR on Desktop / Always use HDR — keeps HDR active on the KDE desktop and in SDR content, not just HDR games.

Turn on HDR output. Leave "HDR on desktop" off for now unless your desktop and SDR apps look correct with it on — many people find the desktop looks better in SDR (see the SDR section below). After enabling, the screen may flash or the TV may re-sync; that's normal as it renegotiates the signal.

Step 3: Run the SteamOS HDR calibration

This is the step that fixes "too dim" and "blown-out highlights." SteamOS includes an HDR calibration slider that sets the peak-brightness target to match your specific TV. Find it in Settings → Display → HDR, run the calibration, and adjust the slider until the test pattern's bright detail is just barely visible against the background — that point tells SteamOS your panel's real peak nits.

Get this wrong and everything looks off: set it too high and highlights clip to flat white; set it too low and the whole image looks washed out and grey. If you only do one calibration step, do this one. It's the difference between HDR that pops and HDR that looks worse than SDR.

Dolby Vision vs HDR10

SteamOS HDR support targets HDR10, the open standard, not Dolby Vision. If your TV lists a "Dolby Vision Game" mode, that's for sources that send a Dolby Vision signal (some consoles, streaming apps) — the Steam Machine isn't one of them for gameplay. Put the relevant input into its standard HDR10 / "HDR Game" picture mode, not a Dolby Vision mode, so the TV's tone-mapping matches what's actually coming in.

Also set the input's picture mode to Game (or "Game HDR"). This isn't about HDR quality directly — it's about input lag. Cinema and Filmmaker modes add processing that pushes latency up noticeably, which you'll feel in any FPS. Game mode with HDR on is what you want for /games that care about responsiveness.

Per-game HDR vs system HDR

There are two paths to HDR in a game, and knowing which you're using prevents the dreaded double tone-map:

Native in-game HDR — the game has its own HDR setting and outputs an HDR signal directly. When this works through Proton, enable HDR in the game's menu and let it drive.
System / auto HDR (gamescope) — SteamOS can apply HDR to SDR-only games via its compositor. This is a reasonable upgrade for older titles with no native HDR.

The mistake to avoid: enabling both the game's native HDR and the system auto-HDR layer at once. That double-processes the image and produces oversaturated, neon-looking color. Rule of thumb — if the game has real HDR, use it and turn auto-HDR off for that title; if it doesn't, let the system layer handle it. Check our methodology for how we label what's native versus composited per game.

Fixing washed-out and oversaturated images

The two most common HDR complaints, and what actually causes them:

Washed out / grey / low contrast. Almost always the calibration slider set too low, or the TV is in an SDR picture mode while receiving an HDR signal. Re-run Step 3, and confirm the TV's picture mode for that input switched to HDR automatically (the TV usually shows an "HDR" badge briefly when the signal arrives). If no badge appears, the HDR handshake failed — go back to the port "Enhanced" toggle in Step 1.

Oversaturated / neon / cartoonish. Usually double HDR (per-game + system, see above), or the TV's color/saturation cranked up from a Vivid-style preset. Drop the input into a neutral Game HDR mode and turn off any "vivid color," "color enhancer," or dynamic-contrast setting. Those TV features fight against an already-correct HDR signal.

If colors look wrong only on the desktop but fine in games, that's the "HDR on desktop" option — turn it off and let the desktop run SDR.

SDR games on an HDR TV

Most of your library is still SDR, and that's fine. You have two sane choices:

Leave system HDR off for SDR titles and let the TV display them as normal SDR. Cleanest, most predictable result.
Use gamescope auto-HDR to lift SDR games into HDR. This can look great on bright OLED/Mini-LED panels but varies game to game — some look richer, some look artificially punchy.

Try auto-HDR on a few favorites and keep it where it flatters them. There's no single right answer, and the honest target here is "looks better than SDR to your eyes on your panel," not a spec-sheet win. For picking titles worth the effort, see best Steam Machine games, and if you're still deciding on hardware, which device covers the trade-offs.