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If you are looking for a general setup guide for the Steam Deck itself, I recommend this comprehensive Steam Deck guide from GitHub user mikeroyal. This guide will primarily use an app called EmuDeck to set up your emulation experience, but I will also touch on other solutions like RetroDeck and Batocera. In this guide I’ll show you how to play your favorite retro (and modern) game systems via software emulation. Valve’s Steam Deck is the perfect storm of handhelds: it has an exceptional price-to-performance ratio, a large game library thanks to its Steam integration, and it is becoming more readily available every month. (I've raised this issue with SDL, so hopefully this will be fixed in a future release.Last updated: 13APR2023 (see Changelog for details) There may be an environment variable or some other way to make SDL handle this input correctly, or it may require a patch to notice that (for example) the "hat" input range is far wider than -1 / 0 / 1 and to just expose it as an axis instead. I'm in the midst of trying to find a solution to this problem (which arose for me in the context of RetroPie's version of EmulationStation) but haven't found the right place to address it yet. This in turn makes the D-Pad all but unusable via SDL: it is impossible to touch the pad perfectly centered on either axis, so in practice SDL will only ever report the hat to be in the corners trying to touch "UP" will waver between UP-LEFT and UP-RIGHT depending whether your finger is just barely left or right of center on the touchpad. 32767, but SDL seems to ignore that and treat it like a regular hat, where Y UP, X > 0 => RIGHT, etc. The hid-steam driver implies this by indicating that ABS_HAT0X/Y have a range of -32767. The problem, of course, is that the Steam Controller's D-Pad isn't actually a D-Pad (with 9 possible input states), it's a touchpad (with two continuous axes). Hid-steam maps the triggers to both BTN_TR2/ BTN_TL2 and ABS_HAT2X/ ABS_HAT2Y, which causes SDL2 to detect another Hat Switch. (ABS trigger values start at 0, pressure is reported as positive values) If only one trigger-button combination is present (upper+lower), they are reported as “right” triggers (BTN_TR/ABS_HAT1X). Lower trigger buttons are reported as BTN_TR2 or ABS_HAT2X (right/ZR) and BTN_TL2 or ABS_HAT2Y (left/ZL). Upper trigger buttons are reported as BTN_TR or ABS_HAT1X (right) and BTN_TL or ABS_HAT1Y (left).

User- space must correctly deal with any situation and choose the most appropriate mode. Trigger buttons can be available as digital or analog buttons or both. This mapping follows the Linux Gamepad Specification which specifies how gamepad trigger buttons (named ZL and ZR in the spec) should be mapped to input event codes.

For reference, hid-steam maps Steam Controller inputs to these input events: ABS_HAT2Y: left trigger