watchthelight labs

Intel panel: backlight control #17

openarea:display
watchthelight 2026-10-21

PCH PWM registers read 0 in the firmware state; Linux exposes intel_backlight (raw, max 504). Likely DPCD/AUX backlight; needs the VBT backlight type. Parent: #12

watchthelight 2026-10-27

Lead for the Intel panel: JulioNectar drives eDP backlight over DPCD AUX on Iris Xe, using the Intel HDR TCON registers (0x344 and 0x354) with the VESA 0x720 registers as the fallback: JulioNectar/Hackintosh-XPS13Plus-IrisXe-Tahoe@453a7b5222

Their licence is ideas only for us, but the register path is standard DisplayPort and worth trying on our panel.

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