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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #11 from Ben Widawsky <ben at bwidawsk.net> ---
(In reply to Topi Pohjolainen from comment #4)
> Among other things I had simplified the test and altered it report every
> faulty pixel (instead of bailing out on first error). That way I had noticed
> that the failing area is always a 4x4 block (16 pixels). And with the RGBA8
> format I've been concentrating on thus corresponding to one cache line of 64
> bytes. Moreover, the erroneous values are not just random garbage but
> exactly the values expected to see for the 4x4 block in position 0,0 - 3,3.
> Hence I've been suspecting the cache simply containing "old data".

Are you seeing any pattern to the location of the erroneous data?

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