[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

            Bug ID: 91704
           Summary: Tonga startx fails since mesa/drm 56d8dd6 amdgpu: make
                    vamgr per device v2
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: adf.lists at gmail.com

Created attachment 117820
  --> https://bugs.freedesktop.org/attachment.cgi?id=117820&action=edit
xorg log

With latest libdrm git I can't startx due to a segfault shown in attached xorg
log.

dmesg logs several -

amdgpu 0000:01:00.0: bo ffff8800bd34b800 va 0x0000100000-0x0000100400 conflict
with 0x0000100000-0x0000100400

This happens with mesa/drm on commit 

56d8dd6 amdgpu: make vamgr per device v2

On the commit before that -

ffa305d amdgpu: add flag to support 32bit VA address v4

I can startx without error but performance is broken eg. scrolling in xterm
takes about a second to refresh the screen.

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