Pixelbook

Fixes

Backlight

Pixelbook doesn't seem to connect the PWM line to control the backlight, but uses DPCD. The patch can be seen here.

To enable DPCD, we need to patch the kernel with the submitted patch.
In addition, we need to create a /etc/modprobe.d/i915.conf with options i915 enable_dpcd_backlight=1

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