Brightness control works before the OS is loaded. i.e. I can use the Fn
keys to increase/decrease brightness at the bios screen before the OS
loads.  If I do increase it to 100%, the OS decreases the display
brightness around the time the acpi video driver is loading. You're
right, it's clearly unrelated and independent of X.

I don't have access to the laptop right now but I'm pretty sure there's
no brightness settings in the bios. Will confirm and attach logs later.

Thanks

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Display brightness requires manual intervention
https://bugs.launchpad.net/bugs/241867
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