ddcutil's udev rule grants the seated user the GPU's i2c buses only when the
PCI class is 0x030000. An AMD iGPU that is not the primary boot display says
0x038000, so on the Framework every DDC bus stayed root-only. Ship the same
grant for the class the hardware actually reports; change-settings installs it.
And two conflations in the probe: an undocked laptop reported its normal state
as an error, and doctor collapsed every error into "No accessible DDC/CI bus".
Nothing external connected is now a clean empty -- doctor's unconfigured path
-- and a real failure surfaces the probe's own words, because an unreadable
bus and a monitor with DDC/CI off in its menu have different fixes.
Claude-Session: https://claude.ai/code/session_01Epx9ZC1gwm81K3jm9x9CKh
Gabriel Brown
6510fdda0f