I have just scrapped Linux Mint 16 for Manjaro (kernel 4.1.15) on my Dell Latitude 6530. I have installed NVidia proprietary drivers in the hope resume from hibernate would work. It does but now I'm facing other issues, such as brightness control.
I've checked Arch Wiki for a solution and the only option they give is xorg-xbacklight. Unfortunately it doesn't work either.
I've tried writing values to
/sys/class/backlight/acpi_video0/brightness but brightness doesn't change. Indeed, as hinted in the Wiki, the ACPI value changes but brightness doesn't. I then tried xbacklight but still no change.
EDIT: I have also tried keeping the [native brightness control] with kernel argument
video.use_native_backlight=1. Still no luck... except that backlight seems to have gotten dimmer. Coincidentally I had set
/sys/class/backlight/acpi_video0/brightness to 50% before rebooting my laptop.
I know brightness control does work because it did with Linux Mint 16 — ok, that was a rather old kernel, i.e. 3.11 or something. NVidia drivers were also the proprietary ones, version 304.
Any hint or suggestion?