My laptop's screen is always at the lowest brightness when resuming from sleep. It is very annoying. I found a fix.
Create an executable file at /usr/lib/systemd/system-sleep/brightness with following contents,
#!/usr/bin/sh
case $1 in
pre) cp /sys/class/backlight/intel_backlight/brightness /tmp/saved_brightness ;;
post) cp /tmp/saved_brightness /sys/class/backlight/intel_backlight/brightness ;;
esac
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