[Bug 111272] [DRI_PRIME] Error on multi GPU with only one enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111272

Michel Dänzer <michel at daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|dri-devel at lists.freedesktop |mesa-dev at lists.freedesktop.
                   |.org                        |org
          Component|DRM/AMDgpu                  |GLX
            Version|XOrg git                    |unspecified
            Product|DRI                         |Mesa
         QA Contact|                            |mesa-dev at lists.freedesktop.
                   |                            |org

--- Comment #7 from Michel Dänzer <michel at daenzer.net> ---
Due to DRI_PRIME=1, libGL tries to initialize the i965 driver with DRI3, which
fails:

 libGL error: Different GPU, but blitImage not implemented for this driver
 libGL error: failed to load driver: i965

So it falls back to DRI2, which uses the AMD GPU, because the Intel one wasn't
initialized in Xorg. DRI2 doesn't support sync-to-vblank via PRIME.

Reassigning to Mesa for now, but DRI_PRIME=1 really isn't intended to be used
with a single GPU.

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