A usbmon capture of G HUB's bring-up (receiver passed to a Win11 VM)
showed the root cause of the dead F-row/media keys AND the F4 blackout:
the RGB SW-control claim switched the keyboard to host mode
(ONBOARD_PROFILES 0x10 0x02). On the G915 TKL host mode disables the
F-row/media keys (#1100), and the host-mode transition made the firmware
re-assert the M/MR indicator (overlaid on F1-F4 on this keyless model)
over the per-key colours. G HUB drives the LEDs from onboard mode via the
RGB SetSWControl claim alone, never switching.
Gated by modelId in device_quirks.py so no other device changes:
- rgb_claim_keeps_onboard_mode(): _claim_sw_control skips the onboard->
host switch for listed models -> F-keys/media keys work and the
power-on F4 blackout is gone, with no timer and no G-key divert.
- rgb_repaint_on_profile_change(): re-assert + repaint on a reported
profile change so an accidental switch doesn't strand the scheme.
Documented residual (cannot be fixed without breaking the keys): F1-F4
are the M1/M2/M3/MR indicator zones on the TKL. The firmware re-asserts
the active-profile indicator on them on profile switch and after idle,
so those keys can show the indicator instead of the user colour.
Claiming that subsystem (G-key divert) would stop it but disables the
F-row/media keys, so onboard mode + working keys is the chosen trade-off.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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