Steam's CEF UI intermittently crashed its GPU child (exit_code=8704) on
NVIDIA+Wayland, falling back to CPU rendering and making Big Picture a
slideshow at 4K/HiDPI. Bake -cef-disable-gpu-sandbox into every steam
invocation via extraArgs so it covers all entry points (desktop, CLI,
Sunshine's Big Picture tile) — launch flags only apply on the invocation
that first starts Steam.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Default nixpkgs sunshine is built -DSUNSHINE_ENABLE_CUDA=FALSE, so every
NVENC probe died with "Couldn't scale frame" and it fell back to CPU
x264. Fix:
- package = sunshine.override { cudaSupport = true; } — gives it the
CUDA scaling/colour-conversion path. Verified: probe now finds
h264_nvenc / hevc_nvenc / av1_nvenc.
- LD_LIBRARY_PATH=/run/opengl-driver/lib on the service so libcuda.so.1
(NVIDIA driver) is discoverable.
- capSysAdmin = false — Hyprland/wlroots capture via wlr-screencopy needs
no CAP_SYS_ADMIN, and the setcap wrapper's secure-exec mode would strip
LD_LIBRARY_PATH and break libcuda loading.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Miguel Palhas