This issue is still there. I'm using a Fujitsu Siemens Esprimo Mobile
D9500. If I put this GRUB_CMDLINE_LINUX="acpi_backlight=vendor" in my
/etc/default/grub file, then the brightness works fine; however, the
brightness controls in Settings no longer work.
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https://bugs.launchpad.net/bugs/823751
Title:
screen brightness not saved
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Public bug reported:
When lightdm starts during boot the screen brightness is dimmed to its
lowest value. Once logging onto the system and going into to the System
Settings->Screen dialog and then setting the correct brightness, the
value is not saved therefore at the next boot you have to do the
