[Bug 447997] [NEW] Intel i915 very slow with linux-2.6.31-12 or above

[Guiodic (Guido Iodice)]

Public bug reported:

How to reproduce:

1. start kk with kernel 2.6.31-12 or -13
2. activate compiz if not
3. see desktop is slower
4. start glxgears
5. drag its windows on desktop: see dragging is very slow

if you start with 2.6.31-11 there is no issue.

It is because this?

* Revert "drm/i915: Check that the relocation points to within the
    target"
  * Revert "drm/i915: fix tiling on IGDNG"

** Affects: linux-meta (Ubuntu)
     Importance: Undecided
         Status: New

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Intel i915 very slow with linux-2.6.31-12 or above
https://bugs.launchpad.net/bugs/447997
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