[Bug 91926] [SKL bisected] texsubimage pbo intermittent failures

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91926

--- Comment #63 from Topi Pohjolainen <topi.pohjolainen at intel.com> ---
(In reply to Topi Pohjolainen from comment #62)
> I got curious if the failing case is for some reason getting pixel values
> for the previous framebuffer. Note that even the simplest case requires two
> internal rounds (the test wants to try with different sub-regions - in my
> case these are now identical as the region is hardcoded).
> I modified the test to use different pixel values for the first and for the
> second round. The second round fails and the failing pixel values are such
> that would be valid only in the second round (in position 0,8 the values are
> such that would be correct for position 0,0). The pixel values are such that
> wouldn't be valid for any position in the first round.

Interesting enough, this setup also decreases the probability of hitting the
bug a lot.

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