[Nouveau] [Bug 100922] New: Redundant nv_backlight created on Optimus enabled laptop.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100922

            Bug ID: 100922
           Summary: Redundant nv_backlight created on Optimus enabled
                    laptop.
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: kai.heng.feng at canonical.com
        QA Contact: xorg-team at lists.x.org

Original bug report:
https://bugs.launchpad.net/bugs/1683445

On Dell E6430, Optimus is enabled in BIOS settings, there are two backlights
interface being created: intel_backlight and nv_backlight. Changing brightness
in nv_backlight does nothing, intel_backlight is in charge here.

Userspace backlight control tools (unity-settings-daemon/gnome-settings-daemon)
will use nv_backlight on this laptop, because nouveau is card0 here.

Dived a little deeper, nv_backlight is created because
'connector->connector_type' is DRM_MODE_CONNECTOR_LVDS on this laptop.

Can we disable nouveau's backlight on Optimus laptop?

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