Sure, here's a rough test plan for the SRU.

0. Use a laptop with an eDP panel.
1. Look at value of brightness for device in /sys/class/backlight. Note it down.
2. Shutdown system. Turn on system.
3. Look at value again, ensure it's the same.

This should be done on the following configurations:
1. Intel laptop from recent generation 
2. AMD laptop that supports custom brightness curve (look in kernel log)
3. AMD laptop that either doesn't support custom brightness curve or it has 
been turned off with the debug mask.

I can handle doing AMD testing with a mainline kernel build from the
Canonical PPA before the kernel is ready to backport from questing.

Note: I worked on the changes upstream both in amdgpu and in systemd.
I'm very familiar with all of this.

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https://bugs.launchpad.net/bugs/2110585

Title:
  Stop using 'actual_brightness' in systemd

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