Graphics
To make graphical boot work (for example using plymouth-drm), enable modesetting in /etc/modules:
i915 modeset=1
and then run update-initramfs -u.
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Laptop-mode-tools
If you use laptop-mode-tools, you will need the following in /etc/laptop-mode/conf.d/lcd-brightness.conf to configure the brightness of the screen:
BATT_BRIGHTNESS_COMMAND="echo 3000" LM_AC_BRIGHTNESS_COMMAND="cat /sys/class/backlight/intel_backlight/max_brightness" NOLM_AC_BRIGHTNESS_COMMAND="cat /sys/class/backlight/intel_backlight/max_brightness" BRIGHTNESS_OUTPUT="/sys/class/backlight/intel_backlight/brightness"
and the following in /etc/laptop-mode/conf.d/cpufreq.conf to use the correct CPU governors:
BATT_CPU_GOVERNOR=powersave LM_AC_CPU_GOVERNOR=performance NOLM_AC_CPU_GOVERNOR=performance