Enabling dual graphics/nvidia optimus in bios fixed the problem for me. When dual graphics is disabled the driver load produces the following path. /sys/class/backlight/acpi_video0/
but with dual graphics enabled , the following path is created. /sys/class/backlight/intel_backlight Finally I am pretty sure unity/xbacklight are using xrandr to change the brightness so that ends up using the graphics card driver to change the brightness. Where gnome is using the kernel path for an acpi call. I don't if it kernel bug or bios or video card bug for not handling the acpi call correctly. Might be better if gnome used xrandr instead or be able to switch. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1520355 Title: Backlight doesn't change in GNOME does in Unity To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1520355/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
