[Bug 90725] Display chunks with xorg intel driver with Accel & when using swap space

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90725

--- Comment #24 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to Fab Stz from comment #23)
> (In reply to Chris Wilson from comment #22)
> > So, setting swizzle unknown is not a good test. Probably, something like
> > is better for testing.
> 
> 
> # cat /sys/kernel/debug/dri/0/i915_swizzle_info                             
> 
> bit6 swizzle for X-tiling = bit9/bit10
> bit6 swizzle for Y-tiling = bit9
> DDC = 0x00200010
> DDC2 = 0x00200020
> C0DRB3 = 0x0020
> C1DRB3 = 0x0010
> L-shaped memory detected
> 
> 
> (1)* xf86 git + kernel patch (comment 22 only) -> kdm screen is ugly (I
> didn't test further)

That implies the swizzle bits are still wrong. Once you have done a soak test
for (3), it would be interesting trying

swizzle_x = I915_BIT_6_SWIZZLE_NONE;
then 
I915_BIT_6_SWIZZLE_9_10
I915_BIT_6_SWIZZLE_9_10_11

(I can only hope we don't have bit17 mixed in, but for completeness:
I915_BIT_6_SWIZZLE_9_10_17)

and see if any of those fix the display of kdm.

The important observation from 3 is that swapping is suspect. This either means
we have the L-shaped issue with varying swizzling depending upon memory
address, or we have bit17 swizzling. I am beginning to suspect the latter.

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