[Nouveau] [Bug 86539] New: [NVAC] Trying to register nv_backlight after NV96 did it

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86539

            Bug ID: 86539
           Summary: [NVAC] Trying to register nv_backlight after NV96 did
                    it
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: pierre.morrow at free.fr
        QA Contact: xorg-team at lists.x.org

Created attachment 109822
  --> https://bugs.freedesktop.org/attachment.cgi?id=109822&action=edit
dmesg

Hardware:
* 9600M GT (NV96)
* 9400M (NVAC)

Tested on
http://cgit.freedesktop.org/~darktama/nouveau/commit/?id=1a9d15cb98ec30dfba43bbe65022f22d978ea9fc

Options: nouveau.noaccel=1 (otherwise falling into bug 86537)

When using the NV96 card to drive the display, the NVAC still tries to register
nv_backlight even though it isn't driving a display and the NV96 already
registered it.

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