[Bug 104487] [KBL] portal2_linux GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104487

--- Comment #6 from Kenneth Graunke <kenneth at whitecape.org> ---
Actually, it looks like they've bound a R8G8B8A8_UNORM texture to a
sampler2DShadow, and are calling shadow2D() call on it.  Pretty sure this is
supposed to return undefined results.  We're translating it to a sample_c
message, which has a restriction that the surface format needs to support
shadow sampling.  My guess is that if you combine that with CCS and HiZ
somehow, it dies badly.

Major kudos to Jason for noticing that.  He gave me a hack that seems to fix
it.

We'll probably need to be properly defensive against this.  Hopefully we should
have a proper fix soon...

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