Comment 45 for bug 505452

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Ferdinand Hagethorn (ferdinand-hagethorn) wrote :

Nice one Mark!

So this boils down to (newbie guide)
Alt+F2 (opens Run Application dialog box): gksudo gedit /etc/default/grub
now change the line
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
save & close

Alt+F2: gksudo update-grub

Now reboot