ugh, so because i can't sleep, I read the Linux i915 history for
Turns out if I disable bit 30 in ivb_pch_pwm_override() to register
BLC_PWM_PCH_CTL1, the acpi video setting works. The keyboard settings
still don't, but I'll worry about that later.
Bit 30 in the linux drm code is:
#define BLM_PCH_OVERRIDE_ENABLE (1 << 30)
The linux dri code doesn't set that for ivybridge - only for broadwell.
(also, the linux driver has POSTING_READ() which I'm guessing is to
ensure things made it out to the device and have been flushed before
doing another IO operation.)
I have my (via sysctl) panel backlight control working again.
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