The brightness value for grub2 is the system BIOS default. That's from
before Linux/Ubuntu is even loaded so we have no control over it, sorry.
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
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Bugs, which
of course ,latest Ubuntu better at remembering brightness but in my case
why only grub2 have max brightness,its melts my eyes every time while
selecting os from grub boot loader and after selecting ubuntu when its
reaches to log in screen its return to normal brightness value
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I think Ubuntu 19.10 is better at remembering your previous brightness
values and yes indeed that will change after grub2. So I don't think
this is a bug. Unless you're saying it's the wrong brightness value
being remembered?
See also (probably unrelated) bug 1848360
** Package changed: xorg (Ubu