impossible to change the brightness

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https://bbs.archlinux.org – Try "quiet splash acpi_osi='!Windows 2012' acpi_backlight=vendor splash" but I can't promise anything, since I use syslinux(it is a nice little bootloader, maybe try it, it is really easy to configure)Do you have acpi and acpid installed? Run "pacman -Q|grep acpi" and you should see acpi and acpid.Do "systemctl status acpid.service", is it running and everything OK? plam https://bbs.archlinux.org/profile.php?id=35031 2013-03-24T13:45:25Z (HowTos)