forked from unom/punktfunk
The system-tuning block (UDP buffers, gamepad udev rule, vhci-hcd autoload, input group) was gated on `sudo -n true` — passwordless sudo — so on a stock SteamOS box (the deck account needs a password) the whole block was silently skipped: /dev/uhid stayed root-only so the gamepad degraded to an Xbox 360 pad, and the UDP buffers stayed at the 416 KB default. Video was unaffected because Game Mode/gamescope needs none of it, which masked the skip on-glass. - install.sh + update.sh: acquire sudo interactively (`sudo -v` prompt on a TTY) instead of requiring passwordless; skip only when there's no TTY or auth fails, and then print the exact manual block plus a `passwd` hint — a stock SteamOS 'deck' account has no password, so sudo can't work until one is set. - update.sh: also retrofit the UDP-buffer sysctl for older/skipped installs, and loudly nag to reboot when the input group was just added (a --user restart does not pick up the new group; only a fresh login does). - steamos-host.md: note this step prompts for the sudo password. Root is unavoidable: the udev rule, input group, and vhci-hcd module are all kernel operations with no user-space alternative. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>