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!!! Trial 2
If the previous trick doesn't work (like in a hp laptop with dual graphics card), try this other one:
https://www.youtube.com/watch?v=l8xa-PkDhhk
{CODE()}
sudo gedit /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash'"
to
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor acpi_osi='!Windows 2013' acpi_osi='!Windows 2012'"
sudo update-grub
reboot twice!!
{CODE}
However, this didn't work for me. Hibernation or suspending fails in that computer with dual graphics card (ati + intel)
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