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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Display chunks with xorg intel driver with Accel & when using swap space"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90725#c24">Comment # 24</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - Display chunks with xorg intel driver with Accel & when using swap space"
href="https://bugs.freedesktop.org/show_bug.cgi?id=90725">bug 90725</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>(In reply to Fab Stz from <a href="show_bug.cgi?id=90725#c23">comment #23</a>)
<span class="quote">> (In reply to Chris Wilson from <a href="show_bug.cgi?id=90725#c22">comment #22</a>)
> > 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 (<a href="show_bug.cgi?id=90725#c22">comment 22</a> only) -> kdm screen is ugly (I
> didn't test further)</span >
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.</pre>
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