This is working fine for me in build 162 on mako
I do see the reset at boot bug
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https://bugs.launchpad.net/bugs/1325991
Title:
Screen brightness resets after turning off the screen
To
** Description changed:
1. Ensure auto-brightness is disabled
2. reduce the brightness to minimum
3. turn off the device screen
4. turn on the screen again
What happens:
Brightness level changes to the "default" value even though the slider shows
its at the lowest
+
+ Bug 1327180