[Bug 98322] QXL drm driver regression in 4.7

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98322

            Bug ID: 98322
           Summary: QXL drm driver regression in 4.7
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/other
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: tiwai at suse.de

Since 4.7 kernel, qxl drm driver spews the errors when using VT:

 kernel: [TTM] Buffer eviction failed
 kernel: qxl 0000:00:02.0: object_init failed for (4026540032, 0x00000001)
 kernel: [drm:qxl_alloc_bo_reserved [qxl]] *ERROR* failed to allocate VRAM BO

In my test case, just install a QEMU/KVM VM with QXL interface, login GUI, and
then switch to VT1.  At login there, the error appears repeatedly.

4.6 kernel works fine.

The git bisection spotted that it was introduced by
6819c3c2517604f979da3de773f2420e07dd4f4b
    drm/qxl: Use drm_fb_helper deferred_io support

This was originally reported for opensuse TW:
  https://bugzilla.suse.com/show_bug.cgi?id=1003298

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