I flashed back free software and intel_reg gives the following:
gpu_hotplug = 0x00000220
gpu_lvds_use_spread_spectrum_clock = 1
gpu_lvds_is_dual_channel = 0
gpu_backlight = 0x879f87da
backlight modulation frequency = 180.016706 Hz
duty cycle = 100%
legacy backlight brightness = 0x83
About the intel_bios_reader, I passed the oprom_0.rom and
got the attached output. Apparently it still thinks I have a type 2
(1024x768) panel instead of the1400x1050 (type 4 or 5) I installed.
None of the frequencies match. (180 vs 122 vs 162)