[Bug 91704] Tonga startx fails since mesa/drm 56d8dd6 amdgpu: make vamgr per device v2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91704

--- Comment #10 from Andy Furniss <adf.lists at gmail.com> ---
> (changing the
> includes to <libdrm/amdgpu_drm.h> etc. won't build.

Oh NVM it will build with system headers as long as I remember to specify the
lib :-)

So outside X it works (assuming silence is success) as user and root.

Inside X it only works as root, device_initialization fails as user - which
prompted me to try startx as root - this works with amdgpu (unless its a fluke
because root got twm and I use fluxbox).

Starting X as root with modesetting starts but I see the same as the
modesetting log I posted.

So maybe some permissions issue.

FWIW card0 is 

crw-rw---- 1 root video 226, 0 Aug 22  2015 /dev/dri/card0

and my user is in group video.

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