Nouveau - Oct 2014 - [Bug 84932] New: Optimus with nouveau no longer works with xorg-server 1.16.1

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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--- Comment #1 from dura <dura at duradsl.duckdns.org> ---
Created attachment 107737
  --> https://bugs.freedesktop.org/attachment.cgi?id=107737&action=edit
xorg-server 1.15 log

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--- Comment #2 from dura <dura at duradsl.duckdns.org> ---
Created attachment 107738
  --> https://bugs.freedesktop.org/attachment.cgi?id=107738&action=edit
xorg-server 1.16 log

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--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
You appear to have bbswtich referenced in your dmesg. Bumblebee is more likely
to just mess things up, and adds nothing over the runtime pm functionality
present in nouveau since 3.12 or so. [There are situations where that's not
working for one reason or another, but this is the minority of situations.]

Do you have customized xorg.conf settings? If so, try moving them out of the
way. (I notice that you're probably explicitly loading glamoregl -- no
reason
to do that, can only cause trouble...)

Probably the big difference between 1.15 and 1.16 is DRI3, perhaps something is
going wrong there... you could either try a git xf86-video-intel ddx or disable
DRI3 (either at build time or with Option "DRI" "2" in the
driver section).
However I'm moderately sure this has worked fine for others.

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--- Comment #4 from Tobias Klausmann <tobias.klausmann at mni.thm.de> ---
DRI3 does not work "out of the box", you'd need some work. But for
now try
disabling DRI3!

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--- Comment #5 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Looks like for prime + dri3 to work, you need render nodes. I thought they were
enabled by default in 3.16, but that is not the case. You can enable them by
adding "drm.rnodes=1" to the kernel cmdline. Or you can upgrade to
3.17.

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--- Comment #6 from dura <dura at duradsl.duckdns.org> ---
Upgrading to kernel 3.17, or booting 3.16 with drm.rnodes=1 do not make it
work.
Recompiling xorg-server 1.16 without dri3 make it work.

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Tobias Klausmann <tobias.klausmann at mni.thm.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #7 from Tobias Klausmann <tobias.klausmann at mni.thm.de> ---
A last note:
for DRI3 you dont have to do the

xrandr --listproviders 
xrandr --setprovideroffloadsink nouveau Intel

dance anymore, it works without! You can disable the compositor as well with
DRI3.

Closing as fixed, feel free to reopen if something is still unclear.

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