Comment 60 for bug 1389215

After using the Nouveau driver for months, I needed performance and came back to Nvidia proprietary driver 340.102 on Ubuntu 16.04. The problem still exist, but my script that fix it by adding 'Option "RegistryDwords" "EnableBrightnessControl=1"' into /usr/share/X11/xorg.conf.d/99-nvidia-proprietary-brigthness-keys-fix.conf works very well.

The only issue left is that when one changes the brightness using the keys Fn and 'brightness up or down' on the keyboard, briefly at each change of brightness, it goes to full for a fraction of a second before settling back to the proper value. This causes an annoying flashing of the screen.

The fix for this is to add "acpi_backlight=native" in /etc/default/grub, like
the following:

  GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=native"

Then, issue, as root:

  update-grub
  reboot

With all these changes applied, the brightness issue is fully fixed.

I could integrate this fix and support of the 9400M card into my script, but would it be of any use? Would it be deployed or just be wasted here in this bug report? Would be nice if that script could be added to the Nvidia proprietary driver package. How could this be done? Who should I contact?