[Nouveau] [Bug 84932] New: Optimus with nouveau no longer works with xorg-server 1.16.1

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84932

            Bug ID: 84932
           Summary: Optimus with nouveau no longer works with xorg-server
                    1.16.1
           Product: Mesa
           Version: 10.2
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: dura at duradsl.duckdns.org

Created attachment 107736
  --> https://bugs.freedesktop.org/attachment.cgi?id=107736&action=edit
dmesg

I have an optimus laptop with intel HD4000 and nvidia GTX 660M.
With xorg-server 1.16.1 the GPU cannot be used. Replacing xorg-server with
1.15.1 version (and same version drivers) make it works again without making
any other changes (even rebooting).

xrandr --listproviders 
xrandr --setprovideroffloadsink nouveau Intel
DRI_PRIME=1 glxinfo | grep "OpenGL vendor string"

With 1.16 version:
Providers: number : 2
Provider 0: id: 0x88 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs:
4 outputs: 5 associated providers: 1 name:Intel
Provider 1: id: 0x5f cap: 0x5, Source Output, Source Offload crtcs: 0 outputs:
0 associated providers: 1 name:nouveau
OpenGL vendor string: Intel Open Source Technology Center

With 1.15 version:
Providers: number : 2
Provider 0: id: 0x88 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs:
4 outputs: 5 associated providers: 1 name:Intel
Provider 1: id: 0x5f cap: 0x5, Source Output, Source Offload crtcs: 0 outputs:
0 associated providers: 1 name:nouveau
OpenGL vendor string: nouveau

Software versions:
MesaLib-10.3.0
xf86-video-nouveau-1.0.11
libdrm-2.4.58
Linux version 3.16.5

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