The 0x8070 V1+ NvConfig (GetNvConfig/SetNvConfig, funcs 4/5) carries a
startup-effect toggle under capability 0x0001 — a pure on/off switch
(0x01/0x02) with no color payload, unlike the 0x8071 NvConfig boot
effects; the boot color comes from the NV-persisted zone effect.
GetNvConfig echoes the capability ID ahead of the value.
Wire format captured from G HUB driving a G560 (usbmon) and the
round-trip hardware-verified. Build probes the capability and
suppresses the setting on devices that NACK it. The G560's only other
NvConfig capability is 0x0002, which on 0x8071 devices causes a
firmware animation-loop lockup — deliberately not exposed.
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