[Bug 78453] [HAWAII] Get acceleration working

[bugzilla-daemon at freedesktop.org]

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

--- Comment #65 from Luzipher <luziphermcleod at yahoo.ie> ---
Sorry, I have to correct myself somewhat: I can run egltri_screen exactly
*twice* with correct output. And I guess the second time only looks right,
because it displays what the first run left in memory. Even if I restart the
machine after elgtri_screen and the run eglgears_screen (!), I get the
triangle, not gears.
So I guess its only the first invocation that works. But it doesn't stall the
gpu, even if it outputs garbage (and nothing is printed in dmesg).

Sometimes it even works again after a few invocations with garbage, but the
triangle is not centered then, but offset to the left or right. The garbage
also looks deterministic (always identical for the third and fourth invocation
after a restart).

After some playing around I also got this from egltri_screen:
    Will use screen size: 1920 x 1080
    radeon: Failed to allocate virtual address for buffer:
    radeon:    size      : 4147200 bytes
    radeon:    alignment : 256 bytes
    radeon:    domains   : 4
    radeon:    va        : 0x0000000001820000
    radeon: Failed to allocate virtual address for buffer:
    radeon:    size      : 4147200 bytes
    radeon:    alignment : 256 bytes
    radeon:    domains   : 4
    radeon:    va        : 0x0000000001820000
    Segmentation fault
And the screen where the output would have shown went black (no signal), while
the other two stayed "alive".

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