[Bug 104388] [snb] GPU HANG: ecode 6:0:0x85fffff8 in fgfs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104388

--- Comment #10 from Fabrice Bellet <fabrice at bellet.info> ---
More details:
 * it works if I use a fixed guardband size of (-1,1,-1,1), which I think
consists to align the guardband size on the viewport size.

 * it also works, if a use the top level window size (1024,717) as the gb_size
value in the function brw_calculate_guardband_size(), instead of 
(8192,8192). Moreover, it hangs when I choose a gb_size value that is greater
than 718 in the computation of ss_gb_ymin and ss_gb_ymax (and only in the
y-range) in this same function. Of course if a gb_size lower than 717 is used,
gb clipping artifacts become visible, but it doesn't hang.

If needed I can provide a trace of the params used when
brw_calculate_guardband_size() is called.

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