[Bug 78453] [HAWAII] Get acceleration working

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78453

--- Comment #36 from Michel Dänzer <michel at daenzer.net> ---
(In reply to comment #34)
> Unfortunatly egltri_screen display a triangle but sometimes and in a very
> broken way : always a message about gpu stall, sometimes it display garbage,
> sometimes a triangle but on the right or on the left. The gpu is
> definitively doing some rendering works correctly but it fails before
> swapping buffer.

Beware that it might display something from a previous run even if it doesn't
actually render anything. To rule that out, you may want to use another simple
test, e.g. one that only clears the window with glClear(), and alternate
between the tests, so you can tell whether they actually render anything.


> BTW why eglinfo also make the gpu stall ? As far as I can tell there is no
> draw operation involved, just egl initialisation and unintialisation.

A command stream might still be submitted to the hardware when the EGL context
is unbound/destroyed. Should be easy to verify via a breakpoint in gdb.

If that is the case, it might be useful to try narrowing down which part of
that 'empty' command stream hangs the GPU.

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